// question: 0 name: Switch category to \$course\$/AP Multiple Choice \$CATEGORY: \$course\$/AP Multiple Choice // question: 4608 name: Multiple Choice Directions ::Multiple Choice Directions::[html]

# Multiple Choice Directions

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This test is meant to simulate the conditions of the AP exam. You are on your honor to take this test\:

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• without a calculator
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• with no reference materials other than a periodic table that shows the element symbol, atomic number, and average atomic mass
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• without assistance from anyone else
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For all questions, assume that the temperature is 298 K, the pressure is 1.00 atmosphere, and solutions are aqueous unless otherwise specified.

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Throughout the test the following symbols have the definitions specified unless otherwise noted.

\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
 T \= temperature\n L, mL \= liter(s), milliliter(s)\n P \= pressure\n g \= grams\n V \= volume\n nm \= nanometer(s)\n S \= entropy\n atm \= atmosphere(s)\n H \= enthalpy\n mm Hg \= millimeters of mercury\n G \= Gibbs free energy\n J, kJ \= joule(s), kilojoule(s)\n R \= molar gas constant\n V \= volts\n n \= number of moles\n mol \= mole(s)\n M \= molar\n \n m \= molal\n \n

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Each of the questions or incomplete statements in the multiple choice section is followed by five suggested answers or completions. In each case, select the letter corresponding with the one that is best.

// question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4103 name: ::AP 1994-01:: Which of the following can be used to predict that a gaseous carbon atom in its ground state is paramagnetic? ::\:\:AP 1994-01\:\: Which of the following can be used to predict that a gaseous carbon atom in its ground state is paramagnetic?::[html]\:\:AP 1994-01\:\: Which of the following can be used to predict that a gaseous carbon atom in its ground state is paramagnetic?{ ~[moodle]Heisenberg uncertainty principle# ~[moodle]Pauli exclusion principle# =[moodle]Hund's rule (principle of maximum multiplicity)# ~[moodle]Shielding effect# ~[moodle]Wave nature of matter# } // question: 4104 name: ::AP 1994-02:: Which of the following explains the experimental phenomenon of electron diffraction? ::\:\:AP 1994-02\:\: Which of the following explains the experimental phenomenon of electron diffraction?::[html]\:\:AP 1994-02\:\: Which of the following explains the experimental phenomenon of electron diffraction?{ ~[moodle]Heisenberg uncertainty principle ~[moodle]Pauli exclusion principle ~[moodle]Hund's rule (principle of maximum multiplicity) ~[moodle]Shielding effect =[moodle]Wave nature of matter } // question: 4105 name: ::AP 1994-03:: Which of the following indicates that an atomic orbital can hold no more than two electrons? ::\:\:AP 1994-03\:\: Which of the following indicates that an atomic orbital can hold no more than two electrons?::[html]\:\:AP 1994-03\:\: Which of the following indicates that an atomic orbital can hold no more than two electrons?{ ~[moodle]Heisenberg uncertainty principle =[moodle]Pauli exclusion principle ~[moodle]Hund's rule (principle of maximum multiplicity) ~[moodle]Shielding effect ~[moodle]Wave nature of matter } // question: 4106 name: ::AP 1994-04:: Which of the following predicts that it is impossible to determine simultaneously the exact position and the exact velocity of an electron? ::\:\:AP 1994-04\:\: Which of the following predicts that it is impossible to determine simultaneously the exact position and the exact velocity of an electron?::[html]\:\:AP 1994-04\:\: Which of the following predicts that it is impossible to determine simultaneously the exact position and the exact velocity of an electron?{ =[moodle]Heisenberg uncertainty principle ~[moodle]Pauli exclusion principle ~[moodle]Hund's rule (principle of maximum multiplicity) ~[moodle]Shielding effect ~[moodle]Wave nature of matter } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4266 name: ::AP 1994-05:: The diagram below is the phase diagram of a pure substance. If the temperature increases from 10°C to 60°C at a constant pressure of 0.4 atmosphere, which of the following processes ... ::\:\:AP 1994-05\:\: The diagram below is the phase diagram of a pure substance. If the temperature increases from 10°C to 60°C at a constant pressure of 0.4 atmosphere, which of the following processes ...::[html]\:\:AP 1994-05\:\: The diagram below is the phase diagram of a pure substance. If the temperature increases from 10°C to 60°C at a constant pressure of 0.4 atmosphere, which of the following processes occurs?

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{ =[moodle]Sublimation ~[moodle]Condensation ~[moodle]Solvation ~[moodle]Fusion ~[moodle]Freezing } // question: 4267 name: ::AP 1994-06:: The diagram below is the phase diagram of a pure substance. If the temperature decreases from 110°C to 40°C at a constant pressure of 1.1 atmospheres, which of the following ... ::\:\:AP 1994-06\:\: The diagram below is the phase diagram of a pure substance. If the temperature decreases from 110°C to 40°C at a constant pressure of 1.1 atmospheres, which of the following ...::[html]\:\:AP 1994-06\:\: The diagram below is the phase diagram of a pure substance. If the temperature decreases from 110°C to 40°C at a constant pressure of 1.1 atmospheres, which of the following processes occurs?

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{ ~[moodle]Sublimation =[moodle]Condensation ~[moodle]Solvation ~[moodle]Fusion ~[moodle]Freezing } // question: 4268 name: ::AP 1994-07:: The diagram below is the phase diagram of a pure substance. If the pressure Increases from 0.5 to 1.5 atmospheres at a constant temperature of 50°C, which of the following processes ... ::\:\:AP 1994-07\:\: The diagram below is the phase diagram of a pure substance. If the pressure Increases from 0.5 to 1.5 atmospheres at a constant temperature of 50°C, which of the following processes ...::[html]\:\:AP 1994-07\:\: The diagram below is the phase diagram of a pure substance. If the pressure Increases from 0.5 to 1.5 atmospheres at a constant temperature of 50°C, which of the following processes occurs?

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{ ~[moodle]Sublimation =[moodle]Condensation ~[moodle]Solvation ~[moodle]Fusion ~[moodle]Freezing } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4164 name: ::AP 1994-08:: Which of the following has the largest bond-dissociation energy? ::\:\:AP 1994-08\:\: Which of the following has the largest bond-dissociation energy?::[html]\:\:AP 1994-08\:\: Which of the following has the largest bond-dissociation energy?{ ~[moodle]Li2 ~[moodle]B2 =[moodle]N2 ~[moodle]O2 ~[moodle]F2 } // question: 4169 name: ::AP 1994-09:: Which of the following has a bond order of 2? ::\:\:AP 1994-09\:\: Which of the following has a bond order of 2?::[html]\:\:AP 1994-09\:\: Which of the following has a bond order of 2?{ ~[moodle]Li2 ~[moodle]B2 ~[moodle]N2 =[moodle]O2 ~[moodle]F2 } // question: 4165 name: ::AP 1994-10:: Which of the following contains 1 sigma (σ) and 2 pi (π) bonds? ::\:\:AP 1994-10\:\: Which of the following contains 1 sigma (σ) and 2 pi (π) bonds?::[html]\:\:AP 1994-10\:\: Which of the following contains 1 sigma (σ) and 2 pi (π) bonds?{ ~[moodle]Li2 ~[moodle]B2 =[moodle]N2 ~[moodle]O2 ~[moodle]F2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3967 name: ::AP 1994-11:: Which of the following is utilized as a coating to protect Fe from corrosion? ::\:\:AP 1994-11\:\: Which of the following is utilized as a coating to protect Fe from corrosion?::[html]\:\:AP 1994-11\:\: Which of the following is utilized as a coating to protect Fe from corrosion?{ ~[moodle]Pb ~[moodle]Ca =[moodle]Zn ~[moodle]As ~[moodle]Na } // question: 3968 name: ::AP 1994-12:: Which of the following is added to silicon to enhance its properties as a semiconductor? ::\:\:AP 1994-12\:\: Which of the following is added to silicon to enhance its properties as a semiconductor?::[html]\:\:AP 1994-12\:\: Which of the following is added to silicon to enhance its properties as a semiconductor?{ ~[moodle]Pb ~[moodle]Ca ~[moodle]Zn =[moodle]As ~[moodle]Na } // question: 3969 name: ::AP 1994-13:: Which of the following is utilized as a shield from sources of radiation? ::\:\:AP 1994-13\:\: Which of the following is utilized as a shield from sources of radiation?::[html]\:\:AP 1994-13\:\: Which of the following is utilized as a shield from sources of radiation?{ =[moodle]Pb ~[moodle]Ca ~[moodle]Zn ~[moodle]As ~[moodle]Na } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4324 name: ::AP 1994-14:: Which of the following is lower for a 1.0-molar aqueous solution of any solute than it is for pure water? ::\:\:AP 1994-14\:\: Which of the following is lower for a 1.0-molar aqueous solution of any solute than it is for pure water?::[html]\:\:AP 1994-14\:\: Which of the following is lower for a 1.0-molar aqueous solution of any solute than it is for pure water?{ ~[moodle]pH ~[moodle]Vapor pressure =[moodle]Freezing point ~[moodle]Electrical conductivity ~[moodle]Absorption of visible light } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4166 name: ::AP 1994-15:: In a molecule in which the central atom exhibits sp3d2 hybrid orbitals, the electron pairs are directed toward the corners of ::\:\:AP 1994-15\:\: In a molecule in which the central atom exhibits sp3d2 hybrid orbitals, the electron pairs are directed toward the corners of::[html]\:\:AP 1994-15\:\: In a molecule in which the central atom exhibits sp3d2 hybrid orbitals, the electron pairs are directed toward the corners of{ ~[moodle]a tetrahedron ~[moodle]a square-based pyramid ~[moodle]a trigonal bipyramid ~[moodle]a square =[moodle]an octahedron } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4429 name: ::AP 1994-16R:: Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar, 32.0 milliliters of 0.500-molar NaOH ... ::\:\:AP 1994-16R\:\: Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar, 32.0 milliliters of 0.500-molar NaOH ...::[html]\:\:AP 1994-16R\:\: Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar, 32.0 milliliters of 0.500-molar NaOH solution was required. What was the concentration of acetic acid in the vinegar if no other acid was present?{ ~[moodle]1.60 M =[moodle]0.800 M ~[moodle]0.600 M ~[moodle]0.450 M ~[moodle]0.200 M } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4369 name: ::AP 1994-17:: Relatively slow rates of chemical reaction are associated with which of the following? ::\:\:AP 1994-17\:\: Relatively slow rates of chemical reaction are associated with which of the following?::[html]\:\:AP 1994-17\:\: Relatively slow rates of chemical reaction are associated with which of the following?{ ~[moodle]The presence of a catalyst ~[moodle]High temperature ~[moodle]High concentration of reactants =[moodle]Strong bonds in reactant molecules ~[moodle]Low activation energy } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3970 name: ::AP 1994-18:: Which species acts as an oxidizing agent in the reaction represented below? 2 H2O + 4 MnO4- + 3 ClO2- → 4 MnO2 + 3 ClO4 ::\:\:AP 1994-18\:\: Which species acts as an oxidizing agent in the reaction represented below? 2 H2O + 4 MnO4- + 3 ClO2- → 4 MnO2 + 3 ClO4::[html]\:\:AP 1994-18\:\: Which species acts as an oxidizing agent in the reaction represented below?
2 H2O + 4 MnO4- + 3 ClO2- → 4 MnO2 + 3 ClO4- + 4 OH-
{ ~[moodle]H2O ~[moodle]ClO4- ~[moodle]ClO2- ~[moodle]MnO2 =[moodle]MnO4- } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4056 name: ::AP 1994-19R:: In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.6 to 1.0 ? ::\:\:AP 1994-19R\:\: In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.6 to 1.0 ?::[html]\:\:AP 1994-19R\:\: In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.6 to 1.0 ?{ ~[moodle]CrO3 =[moodle]CrO2 ~[moodle]CrO ~[moodle]Cr2O ~[moodle]Cr2O3 } // question: 4057 name: ::AP 1994-20:: When the equation below is balanced with lowest whole-number coefficients, the coefficient for OH- is: Ag+ + AsH3(g) + OH ::\:\:AP 1994-20\:\: When the equation below is balanced with lowest whole-number coefficients, the coefficient for OH- is\: Ag+ + AsH3(g) + OH::[html]\:\:AP 1994-20\:\: When the equation below is balanced with lowest whole-number coefficients, the coefficient for OH- is\:

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Ag+ + AsH3(g) + OH → Ag(s) + H3AsO3(aq) + H2O(l)
{ ~[moodle]2 ~[moodle]4 ~[moodle]5 =[moodle]6 ~[moodle]7 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4510 name: ::AP 1994-21:: Correct statements about alpha particles include which of the following? I. They have a mass number of 4 and a charge of +2. II. They are more penetrating than beta particles. III. ... ::\:\:AP 1994-21\:\: Correct statements about alpha particles include which of the following? I. They have a mass number of 4 and a charge of +2. II. They are more penetrating than beta particles. III. ...::[html]\:\:AP 1994-21\:\: Correct statements about alpha particles include which of the following?
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1. They have a mass number of 4 and a charge of +2.
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3. They are more penetrating than beta particles.
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5. They are helium nuclei.
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{ ~[moodle]I only ~[moodle]III only ~[moodle]I and II =[moodle]I and III ~[moodle]II and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3971 name: ::AP 1994-22:: In the equilibrium represented below, the species that act as bases include which of the following? HSO4- + H2O ↔ H3O+ + SO42- ::\:\:AP 1994-22\:\: In the equilibrium represented below, the species that act as bases include which of the following? HSO4- + H2O ↔ H3O+ + SO42-::[html]\:\:AP 1994-22\:\: In the equilibrium represented below, the species that act as bases include which of the following?

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HSO4- + H2O → H3O+ + SO42-
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1. HSO4-
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3. H2O
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5. SO42-
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{ ~[moodle]II only ~[moodle]III only ~[moodle]I and II ~[moodle]I and III =[moodle]II and III } // question: 3972 name: ::AP 1994-23:: The proposed steps for a catalyzed reaction between Ce4+ and Tl+ are represented below: Step 1: Ce4+ + Mn2+ → Ce3+ + Mn3+ Step 2: Ce4+ ::\:\:AP 1994-23\:\: The proposed steps for a catalyzed reaction between Ce4+ and Tl+ are represented below\: Step 1\: Ce4+ + Mn2+ → Ce3+ + Mn3+ Step 2\: Ce4+::[html]\:\:AP 1994-23\:\: The proposed steps for a catalyzed reaction between Ce4+ and Tl+ are represented below\:

Step 1\: Ce4+ + Mn2+ → Ce3+ + Mn3+
Step 2\: Ce4+ + Mn3+ → Ce3+ + Mn4+
Step 3\: Mn4+ + Tl+ → Tl3+ + Mn2+

The products of the overall catalyzed reaction are{ ~[moodle]Ce4+ and Tl+ =[moodle]Ce3+ and Tl3+ ~[moodle]Ce3+ and Mn3+ ~[moodle]Ce3+ and Mn4+ ~[moodle]Tl3+ and Mn2+ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3920 name: ::AP 1994-24R:: A sample of 0.0100 mole of oxygen gas is confined at 127°C and 0.80 atmosphere. What would be the pressure of this sample at 27°C and the same volume? ::\:\:AP 1994-24R\:\: A sample of 0.0100 mole of oxygen gas is confined at 127°C and 0.80 atmosphere. What would be the pressure of this sample at 27°C and the same volume?::[html]\:\:AP 1994-24R\:\: A sample of 0.0100 mole of oxygen gas is confined at 127°C and 0.80 atmosphere. What would be the pressure of this sample at 27°C and the same volume?{ ~[moodle]0.10 atm ~[moodle]0.20 atm =[moodle]0.60 atm ~[moodle]0.80 atm ~[moodle]1.1 atm } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4212 name: ::AP 1994-25R:: Based on the information below: H2(g) + ½ O2(g) → H2O(l)      ΔH° = x ::\:\:AP 1994-25R\:\: Based on the information below\: H2(g) + ½ O2(g) → H2O(l)      ΔH° \= x::[html]\:\:AP 1994-25R\:\: Based on the information below\:

H2(g) + ½ O2(g) → H2O(l) ΔH° \= x

2 Na(s) + ½ O2(g) → Na2O(s) ΔH° \= y

Na(s) + ½ O2(g) + 2 H2(g) → NaOH(s) ΔH° \= z

what is the standard enthalpy change for the following reaction?

Na2O(s) + H2O(l) → 2 NaOH(s)
{ ~[moodle]x + y + z ~[moodle]x + y ~[moodle]x + y =[moodle]2z ~[moodle]z } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3921 name: ::AP 1994-26:: Which of the following actions would be likely to change the boiling point of a sample of a pure liquid in an open container? I. Placing it in a smaller container II. Increasing ... ::\:\:AP 1994-26\:\: Which of the following actions would be likely to change the boiling point of a sample of a pure liquid in an open container? I. Placing it in a smaller container II. Increasing ...::[html]\:\:AP 1994-26\:\: Which of the following actions would be likely to change the boiling point of a sample of a pure liquid in an open container?
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1. Placing it in a smaller container
2. \n
3. Increasing the number of moles of the liquid in the container
4. \n
5. Moving the container and liquid to a higher altitude
6. \n
{ ~[moodle]I only ~[moodle]II only =[moodle]III only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4107 name: ::AP 1994-27:: Which of the following sets of quantum numbers (n, l, ml, ms) best describes the valence electron of highest energy in a ground ::\:\:AP 1994-27\:\: Which of the following sets of quantum numbers (n, l, ml, ms) best describes the valence electron of highest energy in a ground::[html]\:\:AP 1994-27\:\: Which of the following sets of quantum numbers (n, l, ml, ms) best describes the valence electron of highest energy in a ground{ ~[moodle]4, 0, 0, ½ ~[moodle]4, 0, 1, ½ =[moodle]4, 1, 1, ½ ~[moodle]4, 1, 2, ½ ~[moodle]4, 2, 0, ½ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4326 name: ::AP 1994-28:: Given that a solution is 5 percent sucrose by mass, what additional information is necessary to calculate the molarity of the solution? I. The density of water II. The density of ... ::\:\:AP 1994-28\:\: Given that a solution is 5 percent sucrose by mass, what additional information is necessary to calculate the molarity of the solution? I. The density of water II. The density of ...::[html]\:\:AP 1994-28\:\: Given that a solution is 5 percent sucrose by mass, what additional information is necessary to calculate the molarity of the solution?

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1. The density of water
2. \n
3. The density of the solution
4. \n
5. The molar mass of sucrose
6. \n
{ ~[moodle]I only ~[moodle]II only ~[moodle]III only ~[moodle]I and III =[moodle]II and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3973 name: ::AP 1994-29:: When an aqueous solution of NaOH is added to an aqueous solution of potassium dichromate, K2Cr2O7, the dichromate ion is converted to ::\:\:AP 1994-29\:\: When an aqueous solution of NaOH is added to an aqueous solution of potassium dichromate, K2Cr2O7, the dichromate ion is converted to::[html]\:\:AP 1994-29\:\: When an aqueous solution of NaOH is added to an aqueous solution of potassium dichromate, K2Cr2O7, the dichromate ion is converted to{ =[moodle]CrO42- ~[moodle]CrO2 ~[moodle]Cr3+ ~[moodle]Cr2O3(s) ~[moodle]Cr(OH)3(s) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4370 name: ::AP 1994-30:: The energy diagram for the reaction X + Y → Z is shown above. The addition of a catalyst to this reaction would cause a change in which of the indicated energy differences? ::\:\:AP 1994-30\:\: The energy diagram for the reaction X + Y → Z is shown above. The addition of a catalyst to this reaction would cause a change in which of the indicated energy differences?::[html]\:\:AP 1994-30\:\: The energy diagram for the reaction X + YZ is shown below. The addition of a catalyst to this reaction would cause a change in which of the indicated energy differences?

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{ ~[moodle]I only ~[moodle]II only ~[moodle]III only =[moodle]I and II only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4430 name: ::AP 1994-31:: Oxalic acid, H2C2O4, is a diprotic acid with K1 = 5 × 10 ::\:\:AP 1994-31\:\: Oxalic acid, H2C2O4, is a diprotic acid with K1 \= 5 × 10::[html]\:\:AP 1994-31\:\: Oxalic acid, H2C2O4, is a diprotic acid with K1 \= 5 - 10 2 and K2 \= 5 - 10 5. For the reaction below, what is the equilibrium constant?

H2C2O4 + 2 H2O → 2 H3O+ + C2O4
{ ~[moodle]5 × 10 2 ~[moodle]5 × 10 5 =[moodle]2.5 × 10 6 ~[moodle]5 × 10 7 ~[moodle]2.5 × 10 8 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4269 name: ::AP 1994-32:: CH3CH2OH boils at 78°C and CH3OCH3 boils at -24°C, although both compounds have the same composition. This difference in boiling points may be attributed to a difference in ::\:\:AP 1994-32\:\: CH3CH2OH boils at 78°C and CH3OCH3 boils at -24°C, although both compounds have the same composition. This difference in boiling points may be attributed to a difference in::[html]\:\:AP 1994-32\:\: CH3CH2OH boils at 78°C and CH3OCH3 boils at -24°C, although both compounds have the same composition. This difference in boiling points may be attributed to a difference in{ ~[moodle]molecular mass ~[moodle]density ~[moodle]specific heat =[moodle]hydrogen bonding ~[moodle]heat of combustion } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4572 name: ::AP 1994-33:: A hydrocarbon gas with an empirical formula CH2 has a density of 1.88 grams per liter at 0°C and 1.00 atmosphere. A possible formula for the hydrocarbon is ::\:\:AP 1994-33\:\: A hydrocarbon gas with an empirical formula CH2 has a density of 1.88 grams per liter at 0°C and 1.00 atmosphere. A possible formula for the hydrocarbon is::[html]

\:\:AP 1994-33\:\: A hydrocarbon gas with an empirical formula CH2 has a density of 1.88 grams per liter at 0�C and 1.00 atmosphere. A possible formula for the hydrocarbon is

{ ~[moodle]CH2 ~[moodle]C2H4 =[moodle]C3H6 ~[moodle]C4H8 ~[moodle]C5H10 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4270 name: ::AP 1994-34:: Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds below in the order of their increasing solubility in water? X. ... ::\:\:AP 1994-34\:\: Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds below in the order of their increasing solubility in water? X. ...::[html]\:\:AP 1994-34\:\: Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds below in the order of their increasing solubility in water?
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1. CH3 CH2 CH2 CH2 CH3
2. \n
3. CH3 CH2 CH2 CH2 OH
4. \n
5. HO CH2 CH2 CH2 OH
6. \n
{ ~[moodle]Z < Y < X ~[moodle]Y < Z < X ~[moodle]Y < X < Z ~[moodle]X < Z < Y =[moodle]X < Y < Z } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4213 name: ::AP 1994-35:: For which of the following processes would ΔS have a negative value? I. 2 Fe2O3(s) → 4 Fe(s) + 3 O2(g) II. Mg ::\:\:AP 1994-35\:\: For which of the following processes would ΔS have a negative value? I. 2 Fe2O3(s) → 4 Fe(s) + 3 O2(g) II. Mg::[html]\:\:AP 1994-35\:\: For which of the following processes would ΔS have a negative value?
\n
\n
1. 2 Fe2O3(s) → 4 Fe(s) + 3 O2(g)
2. \n
3. Mg2+ + 2 OH- → Mg(OH)2(s)
4. \n
5. H2(g) + C2H4(g) → C2H6(g)
6. \n
{ ~[moodle]I only ~[moodle]I and II only ~[moodle]I and III only =[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4481 name: ::AP 1994-36:: An electrolytic cell based on the reaction represented below was constructed from zinc and copper half cells ::\:\:AP 1994-36\:\: An electrolytic cell based on the reaction represented below was constructed from zinc and copper half cells::[html]\:\:AP 1994-36\:\: An electrolytic cell based on the reaction represented below was constructed from zinc and copper half cells\:

Zn(s) + Cu2+ → Zn2+ + Cu(s)

The observed voltage was found to be 1.00 volt instead of the standard cell potential, E°, of 1.10 volts. Which of the following could correctly account for this observation?{ ~[moodle]The copper electrode was larger than the zinc electrode. ~[moodle]The Zn2+ electrolyte was Zn(NO3)2, while the Cu2+ electrolyte was CuSO4. =[moodle]The Zn2+ solution was more concentrated than the Cu2+ solution. ~[moodle]The solutions in the half cells had different volumes. ~[moodle]The salt bridge contained KCl as the electrolyte. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3922 name: ::AP 1994-37:: A sample of 3.0 grams of an ideal gas at 127°C and 1.0 atmosphere pressure has a volume of 1.50 liters. Which of the following expressions is correct for the molar mass of the gas? ... ::\:\:AP 1994-37\:\: A sample of 3.0 grams of an ideal gas at 127°C and 1.0 atmosphere pressure has a volume of 1.50 liters. Which of the following expressions is correct for the molar mass of the gas? ...::[html]\:\:AP 1994-37\:\: A sample of 3.0 grams of an ideal gas at 127°C and 1.0 atmosphere pressure has a volume of 1.50 liters. Which of the following expressions is correct for the molar mass of the gas? The gas constant, R, is 0.08 (L·atm)/(mol·K).{ ~[moodle](0.08)(400) / (3.0)(1.0)(1.5) ~[moodle](1.0)(1.5) / (3.0)(0.08)(400) ~[moodle](0.08)(1.0)(1.5) / (3.0)(400) =[moodle](3.0)(0.08)(400) / (1.0)(1.5) ~[moodle](3.0)(0.08)(1.5) / (1.0)(400) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4327 name: ::AP 1994-38:: Concentrations of colored substances are commonly measured by means of a spectrophotometer. Which of the following would ensure that correct values are obtained for the measured ... ::\:\:AP 1994-38\:\: Concentrations of colored substances are commonly measured by means of a spectrophotometer. Which of the following would ensure that correct values are obtained for the measured ...::[html]\:\:AP 1994-38\:\: Concentrations of colored substances are commonly measured by means of a spectrophotometer. Which of the following would ensure that correct values are obtained for the measured absorbance?
\n
\n
1. There must be enough sample in the tube to cover the entire light path.
2. \n
3. The instrument must be periodically reset using a standard.
4. \n
5. The solution must be saturated.
6. \n
{ ~[moodle]I only ~[moodle]II only =[moodle]I and II only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3923 name: ::AP 1994-39:: Samples of F2 gas and Xe gas are mixed in a container of fixed volume. The initial partial pressure of the F2 gas is 8.0 atmospheres and that of the Xe gas is 1.7 atmospheres. ... ::\:\:AP 1994-39\:\: Samples of F2 gas and Xe gas are mixed in a container of fixed volume. The initial partial pressure of the F2 gas is 8.0 atmospheres and that of the Xe gas is 1.7 atmospheres. ...::[html]\:\:AP 1994-39\:\: Samples of F2 gas and Xe gas are mixed in a container of fixed volume. The initial partial pressure of the F2 gas is 8.0 atmospheres and that of the Xe gas is 1.7 atmospheres. When all of the Xe gas reacted, forming a solid compound, the pressure of the unreacted F2 gas was 4.6 atmospheres. The temperature remained constant. What is the formula of the compound?{ ~[moodle]XeF ~[moodle]XeF3 =[moodle]XeF4 ~[moodle]XeF6 ~[moodle]XeF8 } // question: 3924 name: ::AP 1994-40:: The system shown below is at equilibrium at 28°C. At this temperature, the vapor pressure of water is 28 millimeters of mercury. The partial pressure of O2(g) in the system ... ::\:\:AP 1994-40\:\: The system shown below is at equilibrium at 28°C. At this temperature, the vapor pressure of water is 28 millimeters of mercury. The partial pressure of O2(g) in the system ...::[html]\:\:AP 1994-40\:\: The system shown below is at equilibrium at 28°C.

\n

At this temperature, the vapor pressure of water is 28 millimeters of mercury. The partial pressure of O2(g) in the system is{ ~[moodle]28 mm Hg ~[moodle]56 mm Hg =[moodle]133 mm Hg ~[moodle]161 mm Hg ~[moodle]189 mm Hg } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3974 name: ::AP 1994-41:: A strip of metallic scandium, Sc, is placed in a beaker containing concentrated nitric acid. A brown gas rapidly forms, the scandium disappears, and the resulting liquid is ... ::\:\:AP 1994-41\:\: A strip of metallic scandium, Sc, is placed in a beaker containing concentrated nitric acid. A brown gas rapidly forms, the scandium disappears, and the resulting liquid is ...::[html]\:\:AP 1994-41\:\: A strip of metallic scandium, Sc, is placed in a beaker containing concentrated nitric acid. A brown gas rapidly forms, the scandium disappears, and the resulting liquid is brown yellow but becomes colorless when warmed. These observations best support which of the following statements?{ ~[moodle]Nitric acid is a strong acid. ~[moodle]In solution scandium nitrate is yellow and scandium chloride is colorless. ~[moodle]Nitric acid reacts with metals to form hydrogen. =[moodle]Scandium reacts with nitric acid to form a brown gas. ~[moodle]Scandium and nitric acid react in mole proportions of 1 to 3. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4538 name: ::AP 1994-42:: The data below were gathered in order to determine the density of an unknown solid. Mass of empty container 3.0 grams Mass of the container plus the solid sample ::\:\:AP 1994-42\:\: The data below were gathered in order to determine the density of an unknown solid. Mass of empty container 3.0 grams Mass of the container plus the solid sample::[html]\:\:AP 1994-42\:\: The data below were gathered in order to determine the density of an unknown solid.

\n\n \n \n \n \n \n \n \n \n \n \n \n \n
 Mass of empty container\n 3.0 grams\n 25.0 grams\n 11.0 cm3\n

The density of the sample should be reported as{ ~[moodle]0.5 g/cm3 ~[moodle]0.50 g/cm3 ~[moodle]2.0 g/cm3 =[moodle]2.00 g/cm3 ~[moodle]2.27 g/cm3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Organic Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Organic Chemistry // question: 4524 name: ::AP 1994-43:: Which of the following pairs of compounds are isomers? ::\:\:AP 1994-43\:\: Which of the following pairs of compounds are isomers?::[html]\:\:AP 1994-43\:\: Which of the following pairs of compounds are isomers?{ =[moodle] and ~[moodle] and ~[moodle] and ~[moodle] and ~[moodle] and } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4325 name: ::AP 1994-44:: Which of the following solutions has the lowest freezing point? ::\:\:AP 1994-44\:\: Which of the following solutions has the lowest freezing point?::[html]\:\:AP 1994-44\:\: Which of the following solutions has the lowest freezing point?{ ~[moodle]0.20 m C6H12O6, glucose ~[moodle]0.20 m NH4Br ~[moodle]0.20 m ZnSO4 ~[moodle]0.20 m KMnO4 =[moodle]0.20 m MgCl2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3925 name: ::AP 1994-45:: A sample of an ideal gas is cooled from 50.0°C to 25.0°C in a sealed container of constant volume. Which of the following values for the gas will decrease? I. The average ... ::\:\:AP 1994-45\:\: A sample of an ideal gas is cooled from 50.0°C to 25.0°C in a sealed container of constant volume. Which of the following values for the gas will decrease? I. The average ...::[html]\:\:AP 1994-45\:\: A sample of an ideal gas is cooled from 50.0°C to 25.0°C in a sealed container of constant volume. Which of the following values for the gas will decrease?
\n
\n
1. The average molecular mass of the gas
2. \n
3. The average distance between the molecules
4. \n
5. The average speed of the molecules
6. \n
{ ~[moodle]I only ~[moodle]II only =[moodle]III only ~[moodle]I and III ~[moodle]II and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3975 name: ::AP 1994-46:: Which of the following solids dissolves in water to form a colorless solution? ::\:\:AP 1994-46\:\: Which of the following solids dissolves in water to form a colorless solution?::[html]\:\:AP 1994-46\:\: Which of the following solids dissolves in water to form a colorless solution?{ ~[moodle]CrCl3 ~[moodle]FeCl3 ~[moodle]CoCl2 ~[moodle]CuCl2 =[moodle]ZnCl2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4328 name: ::AP 1994-47:: Which of the following has the lowest conductivity? ::\:\:AP 1994-47\:\: Which of the following has the lowest conductivity?::[html]\:\:AP 1994-47\:\: Which of the following has the lowest conductivity?{ ~[moodle]0.1 M CuSO4 ~[moodle]0.1 M KOH ~[moodle]0.1 M BaCl2 =[moodle]0.1 M HF ~[moodle]0.1 M HNO3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4393 name: ::AP 1994-48:: Some PCl3 and Cl2 are mixed in a container at 200°C and the system reaches equilibrium according to the equation below: PCl3(g) + Cl2(g) → ::\:\:AP 1994-48\:\: Some PCl3 and Cl2 are mixed in a container at 200°C and the system reaches equilibrium according to the equation below\: PCl3(g) + Cl2(g) →::[html]\:\:AP 1994-48\:\: Some PCl3 and Cl2 are mixed in a container at 200°C and the system reaches equilibrium according to the equation below\:

\n
PCl3(g) + Cl2(g) → PCl5(g) + energy

Which of the following causes an increase in the number of moles of PCl5 present at equilibrium?
\n
\n
1. Decreasing the volume of the container
2. \n
3. Raising the temperature
4. \n
5. Adding a mole of He gas at constant volume
6. \n
{ =[moodle]I only ~[moodle]II only ~[moodle]I and III only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4371 name: ::AP 1994-49:: The isomerization of cyclopropane to propylene is a first order process with a half life of 19 minutes at 500°C. The time it takes for the partial pressure of cyclopropane to decrease from 1.0 atmosphere to 0.125 atm ::\:\:AP 1994-49\:\: The isomerization of cyclopropane to propylene is a first order process with a half life of 19 minutes at 500°C. The time it takes for the partial pressure of cyclopropane to decrease from 1.0 atmosphere to 0.125 atm::[html]\:\:AP 1994-49\:\: The isomerization of cyclopropane to propylene is a first order process with a half life of 19 minutes at 500°C. The time it takes for the partial pressure of cyclopropane to decrease from 1.0 atmosphere to 0.125 atmosphere at 500°C is closest to{ ~[moodle]38 minutes =[moodle]57 minutes ~[moodle]76 minutes ~[moodle]152 minutes ~[moodle]190 minutes } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3976 name: ::AP 1994-50:: Which of the following acids can be oxidized to form a stronger acid? ::\:\:AP 1994-50\:\: Which of the following acids can be oxidized to form a stronger acid?::[html]\:\:AP 1994-50\:\: Which of the following acids can be oxidized to form a stronger acid?{ ~[moodle]H3PO4 ~[moodle]HNO3 ~[moodle]H2CO3 ~[moodle]H3BO3 =[moodle]H2SO3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4394 name: ::AP 1994-51:: Equal numbers of moles of HCl and O2 in a closed system are allowed to reach equilibrium as represented by the equation below: 4 HCl(g) + O2(g) ↔ 2 Cl2 ::\:\:AP 1994-51\:\: Equal numbers of moles of HCl and O2 in a closed system are allowed to reach equilibrium as represented by the equation below\: 4 HCl(g) + O2(g) ↔ 2 Cl2::[html]\:\:AP 1994-51\:\: Equal numbers of moles of HCl and O2 in a closed system are allowed to reach equilibrium as represented by the equation below\:

\n
4 HCl(g) + O2(g) → 2 Cl2(g) + 2 H2O(g)

Which of the following must be true at equilibrium?
\n
\n
1. [HCl] must he less than [Cl2].
2. \n
3. [O2] must be greater than [HCl].
4. \n
5. [Cl2] must equal [H2O].
6. \n
{ ~[moodle]I only ~[moodle]II only ~[moodle]I and III only =[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3977 name: ::AP 1994-52:: When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of ... ::\:\:AP 1994-52\:\: When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of ...::[html]\:\:AP 1994-52\:\: When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of a white precipitate. The chemical was{ ~[moodle]household ammonia, NH3 =[moodle]baking soda, NaHCO3 ~[moodle]table salt, NaCl ~[moodle]epsom salts, MgSO4·7H2O ~[moodle]bleach, 5% NaOCl } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4329 name: ::AP 1994-53:: If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the concentrations of the potassium and the sulfate ... ::\:\:AP 1994-53\:\: If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the concentrations of the potassium and the sulfate ...::[html]\:\:AP 1994-53\:\: If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the concentrations of the potassium and the sulfate ions?{ ~[moodle][K+] \= 0.020 M; [SO42-] \= 0.020 M ~[moodle][K+] \= 1.0 M; [SO42-] \= 2.0 M ~[moodle][K+] \= 2.0 M; [SO42-] \= 1.0 M ~[moodle][K+] \= 2.0 M; [SO42-] \= 2.0 M =[moodle][K+] \= 4.0 M; [SO42-] \= 2.0 M } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4127 name: ::AP 1994-54:: All of the following statements concerning the characteristics of the halogens are true EXCEPT: ::\:\:AP 1994-54\:\: All of the following statements concerning the characteristics of the halogens are true EXCEPT\:::[html]\:\:AP 1994-54\:\: All of the following statements concerning the characteristics of the halogens are true EXCEPT\:{ ~[moodle]The first ionization energies (potentials) decrease as the atomic numbers of the halogens increase. ~[moodle]Fluorine is the best oxidizing agent. ~[moodle]Fluorine atoms have the smallest radii. =[moodle]Iodine liberates free bromine from a solution of bromide ion. ~[moodle]Fluorine is the most electronegative of the halogens. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4431 name: ::AP 1994-55:: What volume of 0.150 molar HCl is required to neutralize 25.0 milliliters of 0.120 molar Ba(OH)2? ::\:\:AP 1994-55\:\: What volume of 0.150 molar HCl is required to neutralize 25.0 milliliters of 0.120 molar Ba(OH)2?::[html]\:\:AP 1994-55\:\: What volume of 0.150 molar HCl is required to neutralize 25.0 milliliters of 0.120 molar Ba(OH)2?{ ~[moodle]20.0 mL ~[moodle]30.0 mL =[moodle]40.0 mL ~[moodle]60.0 mL ~[moodle]80.0 mL } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4058 name: ::AP 1994-56:: It is suggested that SO2 (molar mass = 64.1 grams), which contributes to acid rain, could be removed from a stream of waste gases by bubbling the gases through 0.25 molar KOH, thereby producing K2SO3. What is the maximum mass of SO2 ::\:\:AP 1994-56\:\: It is suggested that SO2 (molar mass \= 64.1 grams), which contributes to acid rain, could be removed from a stream of waste gases by bubbling the gases through 0.25 molar KOH, thereby producing K2SO3. What is the maximum mass of SO2::[html]\:\:AP 1994-56\:\: It is suggested that SO2 (molar mass \= 64.1 grams), which contributes to acid rain, could be removed from a stream of waste gases by bubbling the gases through 0.25 molar KOH, thereby producing K2SO3. What is the maximum mass of SO2 that could be removed by 1,000. liters of the KOH solution?{ ~[moodle]4.0 kg =[moodle]8.0 kg ~[moodle]16 kg ~[moodle]20. kg ~[moodle]40. kg } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4167 name: ::AP 1994-57:: Molecules that have planar configurations include which of the following? I. BCl3 II. CHCl3 III. NCl3 ::\:\:AP 1994-57\:\: Molecules that have planar configurations include which of the following? I. BCl3 II. CHCl3 III. NCl3::[html]\:\:AP 1994-57\:\: Molecules that have planar configurations include which of the following?
\n
\n
1. BCl3
2. \n
3. CHCl3
4. \n
5. NCl3
6. \n
{ =[moodle]I only ~[moodle]III only ~[moodle]I and II only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4214 name: ::AP 1994-58:: The reaction indicated below is thermodynamically spontaneous at 298 K, but becomes nonspontaneous at higher temperatures. Which of the following is true at 298 K? N2(g) + ... ::\:\:AP 1994-58\:\: The reaction indicated below is thermodynamically spontaneous at 298 K, but becomes nonspontaneous at higher temperatures. Which of the following is true at 298 K? N2(g) + ...::[html]\:\:AP 1994-58\:\: The reaction indicated below is thermodynamically spontaneous at 298 K, but becomes nonspontaneous at higher temperatures. Which of the following is true at 298 K?

N2(g) + 3 H2(g) → 2 NH3(g)
{ ~[moodle]ΔG, ΔH, and ΔS are all positive. =[moodle]ΔG, ΔH, and ΔS are all negative. ~[moodle]ΔG and ΔH are negative, but ΔS is positive. ~[moodle]ΔG and ΔS are negative, but ΔH is positive. ~[moodle]ΔG and ΔH are positive, but ΔS is negative. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4059 name: ::AP 1994-59R:: When a 1.25 gram sample of limestone was dissolved in acid, 0.44 gram of CO2 was generated. If the rock contained no carbonate other than CaCO3, what was the percent of CaCO3 by mass in the limestone? ::\:\:AP 1994-59R\:\: When a 1.25 gram sample of limestone was dissolved in acid, 0.44 gram of CO2 was generated. If the rock contained no carbonate other than CaCO3, what was the percent of CaCO3 by mass in the limestone?::[html]\:\:AP 1994-59R\:\: When a 1.25 gram sample of limestone was dissolved in acid, 0.44 gram of CO2 was generated. If the rock contained no carbonate other than CaCO3, what was the percent of CaCO3 by mass in the limestone?{ ~[moodle]33% ~[moodle]44% ~[moodle]67% =[moodle]80% ~[moodle]100% } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4215 name: ::AP 1994-60R:: According to the data in the table below, what is the value of ΔH° for the reaction: I2(g) + 3 Cl2(g) → 2 ICl3(g) ::\:\:AP 1994-60R\:\: According to the data in the table below, what is the value of ΔH° for the reaction\: I2(g) + 3 Cl2(g) → 2 ICl3(g)::[html]\:\:AP 1994-60R\:\: According to the data in the table below, what is the value of ΔH° for the reaction\:
I2(g) + 3 Cl2(g) → 2 ICl3(g)

\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
Bond\n Average Bond Energy (kJ mol-1\n
I-I\n 150\n
Cl-Cl\n 240\n
I-Cl\n 210\n
{ ~[moodle]-870 kJ =[moodle]-390 kJ ~[moodle]+180 kJ ~[moodle]+450 kJ ~[moodle]+1,260 kJ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4432 name: ::AP 1994-61:: A 1 molar solution of which of the following salts has the highest pH? ::\:\:AP 1994-61\:\: A 1 molar solution of which of the following salts has the highest pH?::[html]\:\:AP 1994-61\:\: A 1 molar solution of which of the following salts has the highest pH?{ ~[moodle]NaNO3 =[moodle]Na2CO3 ~[moodle]NH4Cl ~[moodle]NaHSO4 ~[moodle]Na2SO4 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4168 name: ::AP 1994-62:: The electron dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom? ::\:\:AP 1994-62\:\: The electron dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom?::[html]\:\:AP 1994-62\:\: The electron dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom?{ =[moodle]H2S ~[moodle]NH3 ~[moodle]CH4 ~[moodle]HCN ~[moodle]CO2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4482 name: ::AP 1994-63R:: Which of the following expressions is correct for the maximum mass of copper that could be plated out by electrolyzing aqueous CuCl2 for 16.0 hours at a constant current of 3.... ::\:\:AP 1994-63R\:\: Which of the following expressions is correct for the maximum mass of copper that could be plated out by electrolyzing aqueous CuCl2 for 16.0 hours at a constant current of 3....::[html]\:\:AP 1994-63R\:\: Which of the following expressions is correct for the maximum mass of copper that could be plated out by electrolyzing aqueous CuCl2 for 16.0 hours at a constant current of 3.00 amperes? (1 faraday \= 96,500 coulombs){ ~[moodle](16)(3,600)(3.0)(63.55)(2) / (96,500) =[moodle](16)(3,600)(3.0)(63.55) / (96,500)(2) ~[moodle](16)(3,600)(3.0)(63.55) / (96,500) ~[moodle](16)(60)(3.0)(96,500)(2) / (63.55) ~[moodle](16)(60)(3.0)(96,500) / (63.55)(2) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3926 name: ::AP 1994-64:: At 25°C, a sample of NH3 (molar mass 17 grams) effuses at the rate of 0.050 mole per minute. Under the same conditions, which of the following gases effuses at approximately ... ::\:\:AP 1994-64\:\: At 25°C, a sample of NH3 (molar mass 17 grams) effuses at the rate of 0.050 mole per minute. Under the same conditions, which of the following gases effuses at approximately ...::[html]\:\:AP 1994-64\:\: At 25°C, a sample of NH3 (molar mass 17 grams) effuses at the rate of 0.050 mole per minute. Under the same conditions, which of the following gases effuses at approximately one half that rate?{ ~[moodle]O2 (molar mass 32 grams) ~[moodle]He (molar mass 4.0 grams) ~[moodle]CO2 (molar mass 44 grams) =[moodle]Cl2 (molar mass 71 grams) ~[moodle]CH4 (molar mass 16 grams) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Precipitation Equilibria \$CATEGORY: \$course\$/AP Multiple Choice/Precipitation Equilibria // question: 4464 name: ::AP 1994-65:: Barium sulfate is LEAST soluble in a 0.01 molar solution of which of the following? ::\:\:AP 1994-65\:\: Barium sulfate is LEAST soluble in a 0.01 molar solution of which of the following?::[html]\:\:AP 1994-65\:\: Barium sulfate is LEAST soluble in a 0.01 molar solution of which of the following?{ =[moodle]Al2(SO4)3 ~[moodle](NH4)2SO4 ~[moodle]Na2SO4 ~[moodle]NH3 ~[moodle]BaCl2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4433 name: ::AP 1994-66:: What is the pH of a 1.0 × 10 2 molar solution of HCN? (For HCN, Ka = 4.0 - 10 10.) ::\:\:AP 1994-66\:\: What is the pH of a 1.0 × 10 2 molar solution of HCN? (For HCN, Ka \= 4.0 - 10 10.)::[html]\:\:AP 1994-66\:\: What is the pH of a 1.0 - 10 2 molar solution of HCN? (For HCN, Ka \= 4.0 - 10 10.){ ~[moodle]10 ~[moodle]between 7 and 10 ~[moodle]7 =[moodle]between 1 and 7 ~[moodle]4 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4539 name: ::AP 1994-67:: Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystallization. This fractional crystallization is possible because ... ::\:\:AP 1994-67\:\: Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystallization. This fractional crystallization is possible because ...::[html]\:\:AP 1994-67\:\: Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystallization. This fractional crystallization is possible because substances X and Y have different{ ~[moodle]boiling points ~[moodle]melting points ~[moodle]densities ~[moodle]crystal colors =[moodle]solubilities } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4271 name: ::AP 1994-68:: Which of the following molecules has a dipole moment of zero? ::\:\:AP 1994-68\:\: Which of the following molecules has a dipole moment of zero?::[html]\:\:AP 1994-68\:\: Which of the following molecules has a dipole moment of zero?{ =[moodle]C6H6 (benzene) ~[moodle]NO ~[moodle]SO2 ~[moodle]NH3 ~[moodle]H2S } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4540 name: ::AP 1994-69:: Correct procedures for a titration include which of the following? I. Draining a pipet by touching the tip to the side of the container used for the titration II. Rinsing the ... ::\:\:AP 1994-69\:\: Correct procedures for a titration include which of the following? I. Draining a pipet by touching the tip to the side of the container used for the titration II. Rinsing the ...::[html]\:\:AP 1994-69\:\: Correct procedures for a titration include which of the following?
\n
\n
1. Draining a pipet by touching the tip to the side of the container used for the titration
2. \n
3. Rinsing the buret with distilled water just before filling it with the liquid to be titrated
4. \n
5. Swirling the solution frequently during the titration
6. \n
{ ~[moodle]I only ~[moodle]II only =[moodle]I and III only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 4541 name: ::AP 1994-70:: To determine the molar mass of a solid monoprotic acid, a student titrated a weighed sample of the acid with standardized aqueous NaOH. Which of the following could explain why the ... ::\:\:AP 1994-70\:\: To determine the molar mass of a solid monoprotic acid, a student titrated a weighed sample of the acid with standardized aqueous NaOH. Which of the following could explain why the ...::[html]\:\:AP 1994-70\:\: To determine the molar mass of a solid monoprotic acid, a student titrated a weighed sample of the acid with standardized aqueous NaOH. Which of the following could explain why the student obtained a molar mass that was too large?
\n
\n
1. Failure to rinse all acid from the weighing paper into the titration vessel
2. \n
3. Addition of more water than was needed to dissolve the acid
4. \n
5. Addition of some base beyond the equivalence point
6. \n
{ =[moodle]I only ~[moodle]III only ~[moodle]I and II only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4060 name: ::AP 1994-71:: If 1 mole of O2 oxidizes Fe(OH)2 according to the unbalanced reaction represented below, how many moles of Fe(OH)3 can be formed? Fe(OH)2 + O2 ::\:\:AP 1994-71\:\: If 1 mole of O2 oxidizes Fe(OH)2 according to the unbalanced reaction represented below, how many moles of Fe(OH)3 can be formed? Fe(OH)2 + O2::[html]\:\:AP 1994-71\:\: If 1 mole of O2 oxidizes Fe(OH)2 according to the unbalanced reaction represented below, how many moles of Fe(OH)3 can be formed?

Fe(OH)2 + O2 + H2O → Fe(OH)3
{ ~[moodle]2 ~[moodle]3 =[moodle]4 ~[moodle]5 ~[moodle]6 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4511 name: ::AP 1994-72:: The nuclide 24996Cm is radioactive and decays by the loss of one beta (β ::\:\:AP 1994-72\:\: The nuclide 24996Cm is radioactive and decays by the loss of one beta (β::[html]\:\:AP 1994-72\:\: The nuclide 24996Cm is radioactive and decays by the loss of one beta (β ) particle. The product nuclide is{ ~[moodle]24594Pu ~[moodle]24595Am ~[moodle]24596Cm ~[moodle]25096Cm =[moodle]24997Bk } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4395 name: ::AP 1994-73R:: When 0.40 mole of SO2 and 0.60 mole of O2 are placed in an evacuated 1.00 liter flask, the reaction represented above occurs. After the reactants and the product reach equilibrium and the initial temperature is restored, the fl ::\:\:AP 1994-73R\:\: When 0.40 mole of SO2 and 0.60 mole of O2 are placed in an evacuated 1.00 liter flask, the reaction represented above occurs. After the reactants and the product reach equilibrium and the initial temperature is restored, the fl::[html]\:\:AP 1994-73R\:\: When 0.40 mole of SO2 and 0.60 mole of O2 are placed in an evacuated 1.00 liter flask, the reaction represented above occurs. After the reactants and the product reach equilibrium and the initial temperature is restored, the flask is found to contain 0.30 mole of SO3. Based on these results, the equilibrium constant, Kc, for the reaction is

2 SO2(g) + O2(g) → 2 SO3(g)
{ =[moodle](0.30)2 / (0.45)(0.10)2 ~[moodle](0.30)2 / (0.60)(0.40)2 ~[moodle](2 × 0.30) / (0.45)(2 × 0.10) ~[moodle](0.30) / (0.45)(0.10) ~[moodle](0.30) / (0.60)(0.40) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3978 name: ::AP 1994-74:: A solution of calcium hypochlorite, a common additive to swimming pool water, is ::\:\:AP 1994-74\:\: A solution of calcium hypochlorite, a common additive to swimming pool water, is::[html]\:\:AP 1994-74\:\: A solution of calcium hypochlorite, a common additive to swimming pool water, is{ =[moodle]basic because of the hydrolysis of the OCl ~[moodle]basic because Ca(OH)2 is a weak and insoluble base ~[moodle]neutral if the concentration is kept below 0.1 molar ~[moodle]acidic because of the hydrolysis of the Ca2+ ions ~[moodle]acidic because the acid HOCl is formed } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4483 name: ::AP 1994-75:: A direct current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair ::\:\:AP 1994-75\:\: A direct current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair::[html]\:\:AP 1994-75\:\: A direct current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair of platinum electrodes that dip into 0.1 molar KI solution. Which of the following correctly identifies the polarities of the power supply terminals?{ ~[moodle]A gas will be evolved only at the positive electrode. =[moodle]A gas will be evolved only at the negative electrode. ~[moodle]A brown color will appear in the solution near the negative electrode. ~[moodle]A metal will be deposited on the positive electrode. ~[moodle]None of the methods above will identify the polarities of the power supply terminals. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4097 name: ::AP 1999-01:: The energy required to convert a ground-state atom in the gas phase to a gaseous positive ion ::\:\:AP 1999-01\:\: The energy required to convert a ground-state atom in the gas phase to a gaseous positive ion::[html]\:\:AP 1999-01\:\: The energy required to convert a ground-state atom in the gas phase to a gaseous positive ion{ ~[moodle]Activation energy ~[moodle]Free energy =[moodle]Ionization energy ~[moodle]Kinetic energy ~[moodle]Lattice energy } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4258 name: ::AP 1999-02:: The energy change that occurs in the conversion of an ionic solid to widely separated gaseous ions ::\:\:AP 1999-02\:\: The energy change that occurs in the conversion of an ionic solid to widely separated gaseous ions::[html]\:\:AP 1999-02\:\: The energy change that occurs in the conversion of an ionic solid to widely separated gaseous ions{ ~[moodle]Activation energy ~[moodle]Free energy ~[moodle]Ionization energy ~[moodle]Kinetic energy =[moodle]Lattice energy } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4208 name: ::AP 1999-03:: The energy in a chemical or physical change that is available to do useful work ::\:\:AP 1999-03\:\: The energy in a chemical or physical change that is available to do useful work::[html]\:\:AP 1999-03\:\: The energy in a chemical or physical change that is available to do useful work{ ~[moodle]Activation energy =[moodle]Free energy ~[moodle]Ionization energy ~[moodle]Kinetic energy ~[moodle]Lattice energy } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4098 name: ::AP 1999-04:: Which of the following atomic orbital diagrams represents the energy required to form the transition state in a chemical reaction? ::\:\:AP 1999-04\:\: Which of the following atomic orbital diagrams represents the energy required to form the transition state in a chemical reaction?::[html]\:\:AP 1999-04\:\: Which of the following atomic orbital diagrams represents the energy required to form the transition state in a chemical reaction?{ =[moodle]1s    2s ↑  ~[moodle]1s ↑↓ 2s ↑↓ ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑  ↑     ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ ~[moodle][Ar] 4s ↑↓ 3d ↑↓ ↑  ↑  ↑  } // question: 4099 name: ::AP 1999-05:: Which of the following atomic orbital diagrams represents an atom that is chemically unreactive ::\:\:AP 1999-05\:\: Which of the following atomic orbital diagrams represents an atom that is chemically unreactive::[html]\:\:AP 1999-05\:\: Which of the following atomic orbital diagrams represents an atom that is chemically unreactive{ ~[moodle]1s    2s ↑  ~[moodle]1s ↑↓ 2s ↑↓ ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑  ↑     =[moodle]1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ ~[moodle][Ar] 4s ↑↓ 3d ↑↓ ↑  ↑  ↑  } // question: 4100 name: ::AP 1999-06:: Which of the following atomic orbital diagrams represents an atom in an excited state ::\:\:AP 1999-06\:\: Which of the following atomic orbital diagrams represents an atom in an excited state::[html]\:\:AP 1999-06\:\: Which of the following atomic orbital diagrams represents an atom in an excited state{ =[moodle]1s    2s ↑  ~[moodle]1s ↑↓ 2s ↑↓ ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑  ↑     ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ ~[moodle][Ar] 4s ↑↓ 3d ↑↓ ↑  ↑  ↑  } // question: 4101 name: ::AP 1999-07:: Which of the following atomic orbital diagrams represents an atom that has four valence electrons ::\:\:AP 1999-07\:\: Which of the following atomic orbital diagrams represents an atom that has four valence electrons::[html]\:\:AP 1999-07\:\: Which of the following atomic orbital diagrams represents an atom that has four valence electrons{ ~[moodle]1s    2s ↑  ~[moodle]1s ↑↓ 2s ↑↓ =[moodle]1s ↑↓ 2s ↑↓ 2p ↑  ↑     ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ ~[moodle][Ar] 4s ↑↓ 3d ↑↓ ↑  ↑  ↑  } // question: 4102 name: ::AP 1999-08:: Which of the following atomic orbital diagrams represents an atom of a transition metal ::\:\:AP 1999-08\:\: Which of the following atomic orbital diagrams represents an atom of a transition metal::[html]\:\:AP 1999-08\:\: Which of the following atomic orbital diagrams represents an atom of a transition metal{ ~[moodle]1s    2s ↑  ~[moodle]1s ↑↓ 2s ↑↓ ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑  ↑     ~[moodle]1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ =[moodle][Ar] 4s ↑↓ 3d ↑↓ ↑  ↑  ↑  } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4422 name: ::AP 1999-09:: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1:1 mole ratios. Which solution would have the lowest pH? ::\:\:AP 1999-09\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios. Which solution would have the lowest pH?::[html]\:\:AP 1999-09\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios.
Which solution would have the lowest pH?{ ~[moodle]NH3 and NH4Cl ~[moodle]H3PO4 and NaH2PO4 =[moodle]HCl and NaCl ~[moodle]NaOH and NH3 ~[moodle]NH3 and HC2H3O2 (acetic acid) } // question: 4423 name: ::AP 1999-10:: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1:1 mole ratios. Which solution is most nearly neutral? ::\:\:AP 1999-10\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios. Which solution is most nearly neutral?::[html]\:\:AP 1999-10\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios.
Which solution is most nearly neutral?{ ~[moodle]NH3 and NH4Cl ~[moodle]H3PO4 and NaH2PO4 ~[moodle]HCl and NaCl ~[moodle]NaOH and NH3 =[moodle]NH3 and HC2H3O2 (acetic acid) } // question: 4424 name: ::AP 1999-11:: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1:1 mole ratios. Which soultion would act as a buffer at a pH > 8? ::\:\:AP 1999-11\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios. Which soultion would act as a buffer at a pH > 8?::[html]\:\:AP 1999-11\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios.
Which soultion would act as a buffer at a pH > 8?{ =[moodle]NH3 and NH4Cl ~[moodle]H3PO4 and NaH2PO4 ~[moodle]HCl and NaCl ~[moodle]NaOH and NH3 ~[moodle]NH3 and HC2H3O2 (acetic acid) } // question: 4425 name: ::AP 1999-12:: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1:1 mole ratios. Which solution would act as a buffer at a pH < 6? ::\:\:AP 1999-12\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios. Which solution would act as a buffer at a pH < 6?::[html]\:\:AP 1999-12\:\: Assume each of the following pairs of substances are 1 M aqueous solutions containing 1\:1 mole ratios.
Which solution would act as a buffer at a pH < 6?{ ~[moodle]NH3 and NH4Cl =[moodle]H3PO4 and NaH2PO4 ~[moodle]HCl and NaCl ~[moodle]NaOH and NH3 ~[moodle]NH3 and HC2H3O2 (acetic acid) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4259 name: ::AP 1999-13:: The bonding in cesium chloride, CsCl (s), is best described as: ::\:\:AP 1999-13\:\: The bonding in cesium chloride, CsCl (s), is best described as\:::[html]\:\:AP 1999-13\:\: The bonding in cesium chloride, CsCl (s), is best described as\:{ =[moodle]Lattice of positive and negative ions held together by electrostatic forces ~[moodle]Closely packed lattice with delocalized electrons throughout ~[moodle]Strong single covalent bonds with weak intermolecular forces ~[moodle]Strong multiple covalent bonds (including π-bonds) with weak intermolecular forces ~[moodle]Macromolecules held together with strong polar bonds } // question: 4260 name: ::AP 1999-14:: The bonding in gold, Au (s), is best described as: ::\:\:AP 1999-14\:\: The bonding in gold, Au (s), is best described as\:::[html]\:\:AP 1999-14\:\: The bonding in gold, Au (s), is best described as\:{ ~[moodle]Lattice of positive and negative ions held together by electrostatic forces =[moodle]Closely packed lattice with delocalized electrons throughout ~[moodle]Strong single covalent bonds with weak intermolecular forces ~[moodle]Strong multiple covalent bonds (including π-bonds) with weak intermolecular forces ~[moodle]Macromolecules held together with strong polar bonds } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4158 name: ::AP 1999-15:: The bonding in carbon dioxide, CO2 (s), is best described as: ::\:\:AP 1999-15\:\: The bonding in carbon dioxide, CO2 (s), is best described as\:::[html]\:\:AP 1999-15\:\: The bonding in carbon dioxide, CO2 (s), is best described as\:{ ~[moodle]Lattice of positive and negative ions held together by electrostatic forces ~[moodle]Closely packed lattice with delocalized electrons throughout ~[moodle]Strong single covalent bonds with weak intermolecular forces =[moodle]Strong multiple covalent bonds (including π-bonds) with weak intermolecular forces ~[moodle]Macromolecules held together with strong polar bonds } // question: 4159 name: ::AP 1999-16:: The bonding in methane, CH4 (s), is best described as: ::\:\:AP 1999-16\:\: The bonding in methane, CH4 (s), is best described as\:::[html]\:\:AP 1999-16\:\: The bonding in methane, CH4 (s), is best described as\:{ ~[moodle]Lattice of positive and negative ions held together by electrostatic forces ~[moodle]Closely packed lattice with delocalized electrons throughout =[moodle]Strong single covalent bonds with weak intermolecular forces ~[moodle]Strong multiple covalent bonds (including π-bonds) with weak intermolecular forces ~[moodle]Macromolecules held together with strong polar bonds } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3893 name: ::AP 1999-17:: Which of the following elements is a gas in its standard state at 298 K? ::\:\:AP 1999-17\:\: Which of the following elements is a gas in its standard state at 298 K?::[html]\:\:AP 1999-17\:\: Which of the following elements is a gas in its standard state at 298 K?{ ~[moodle]Lithium ~[moodle]Nickel ~[moodle]Bromine ~[moodle]Uranium =[moodle]Fluorine } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3960 name: ::AP 1999-18:: Which of the following elements reacts with water to form a strong base? ::\:\:AP 1999-18\:\: Which of the following elements reacts with water to form a strong base?::[html]\:\:AP 1999-18\:\: Which of the following elements reacts with water to form a strong base?{ =[moodle]Lithium ~[moodle]Nickel ~[moodle]Bromine ~[moodle]Uranium ~[moodle]Fluorine } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4366 name: ::AP 1999-19:: Which of the following best describes the role of the spark from the spark plug in an automobile engine? ::\:\:AP 1999-19\:\: Which of the following best describes the role of the spark from the spark plug in an automobile engine?::[html]\:\:AP 1999-19\:\: Which of the following best describes the role of the spark from the spark plug in an automobile engine?{ ~[moodle]The spark decreases the energy of activation for the slow step. ~[moodle]The spark increases the concentration of the volatile reactant. =[moodle]The spark supplies some of the energy of activation for the combustion reaction. ~[moodle]The spark provides a more favorable activated complex for the combustion reaction. ~[moodle]The spark provides the heat of vaporization for the volatile hydrocarbon. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4050 name: ::AP 1999-20:: What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2? ::\:\:AP 1999-20\:\: What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2?::[html]\:\:AP 1999-20\:\: What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2?{ ~[moodle]9.85 g =[moodle]19.7 g ~[moodle]24.5 g ~[moodle]39.4 g ~[moodle]48.9 g } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4535 name: ::AP 1999-21:: When a solution of sodium chloride is vaporized in a flame, the color of the flame is ::\:\:AP 1999-21\:\: When a solution of sodium chloride is vaporized in a flame, the color of the flame is::[html]\:\:AP 1999-21\:\: When a solution of sodium chloride is vaporized in a flame, the color of the flame is{ ~[moodle]blue =[moodle]yellow ~[moodle]green ~[moodle]violet ~[moodle]white } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4209 name: ::AP 1999-22:: Of the following reactions, which involves the largest decrease in entropy? ::\:\:AP 1999-22\:\: Of the following reactions, which involves the largest decrease in entropy?::[html]\:\:AP 1999-22\:\: Of the following reactions, which involves the largest decrease in entropy?{ ~[moodle]CaCO3 (s) → CaO (s) + CO2 (g) ~[moodle]2 CO (g) + O2 (g) → 2 CO2 (g) ~[moodle]Pb(NO3)2 (s) + 2 KI (s) → PbI2 (s) + 2 KNO3 (s) ~[moodle]C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2(g) =[moodle]4 La (s) + 3 O2 (g) → 2 La2O3 (s) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3894 name: ::AP 1999-23:: A hot-air balloon, shown below, rises. Which of the following is the best explanation for this observation? ::\:\:AP 1999-23\:\: A hot-air balloon, shown below, rises. Which of the following is the best explanation for this observation?::[html]\:\:AP 1999-23\:\: A hot-air balloon, shown below, rises. Which of the following is the best explanation for this observation?{ ~[moodle]The pressure on the walls of the balloon increases with increasing temperature. ~[moodle]The difference in temperature between the air inside and outside the balloon produces convection currents. ~[moodle]The cooler air outside the balloon pushes in on the walls of the balloon. ~[moodle]The rate of diffusion of cooler air is less than that of warmer air. =[moodle]The air density inside the balloon is less than that of the surrounding air. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4533 name: ::AP 1999-24:: The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately? ::\:\:AP 1999-24\:\: The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately?::[html]\:\:AP 1999-24\:\: The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately?{ ~[moodle]Dry the affected area with paper towels ~[moodle]Sprinkle the affected area with powdered Na2SO4 (s) ~[moodle]Flush the affected area with water and then with a dilute NaOH solution =[moodle]Flush the affected area with water and then with a dilute NaHCO3 solution ~[moodle]Flush the affected area with water and then with a dilute vinegar solution } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4261 name: ::AP 1999-25:: The cooling curve for a pure substance as it changes from a liquid to a solid is shown below. The solid and the liquid coexist at ::\:\:AP 1999-25\:\: The cooling curve for a pure substance as it changes from a liquid to a solid is shown below. The solid and the liquid coexist at::[html]\:\:AP 1999-25\:\: The cooling curve for a pure substance as it changes from a liquid to a solid is shown below.

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The solid and the liquid coexist at\:{ ~[moodle]point Q only ~[moodle]point R only =[moodle]all points on the curve between Q and S ~[moodle]all points on the curve between R and T ~[moodle]no point on the curve } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4051 name: ::AP 1999-26:: ... C10H12O4S (s) + ... O2 (g) → ... CO2 (g) + ... SO2 (g) + ... H2 ::\:\:AP 1999-26\:\: ... C10H12O4S (s) + ... O2 (g) → ... CO2 (g) + ... SO2 (g) + ... H2::[html]\:\:AP 1999-26\:\:
... C10H12O4S (s) + ... O2 (g) → ... CO2 (g) + ... SO2 (g) + ... H2O (g)

When the equation above is balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O2 (g) is{ ~[moodle]6 ~[moodle]7 =[moodle]12 ~[moodle]14 ~[moodle]28 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4536 name: ::AP 1999-27:: Appropriate uses of a visible-light spectrophotometer include which of the following? I) Determining the concentration of a solution of Cu(NO3)2 II) Measuring the conductivity of a solution ... ::\:\:AP 1999-27\:\: Appropriate uses of a visible-light spectrophotometer include which of the following? I) Determining the concentration of a solution of Cu(NO3)2 II) Measuring the conductivity of a solution ...::[html]\:\:AP 1999-27\:\: Appropriate uses of a visible-light spectrophotometer include which of the following?

I) Determining the concentration of a solution of Cu(NO3)2
II) Measuring the conductivity of a solution of KMnO4
III. Determining which ions are present in a solution that may contain Na+, Mg2+, Al3+{ =[moodle]I only ~[moodle]II only ~[moodle]III only ~[moodle]I and II only ~[moodle]I and III only } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4262 name: ::AP 1999-28:: The melting point of MgO is higher than that of NaF. Explanations for this observation include which of the following? I) Mg2+ is more positively charged than Na+. II) O2- is more neg ::\:\:AP 1999-28\:\: The melting point of MgO is higher than that of NaF. Explanations for this observation include which of the following? I) Mg2+ is more positively charged than Na+. II) O2- is more neg::[html]\:\:AP 1999-28\:\: The melting point of MgO is higher than that of NaF. Explanations for this observation include which of the following?
\n
\n
1. Mg2+ is more positively charged than Na+.
2. \n
3. O2- is more negatively charged than F-.
4. \n
5. The O2- ion is smaller than the F- ion.
6. \n
{ ~[moodle]II only =[moodle]I and II only ~[moodle]I and III only ~[moodle]II and III only ~[moodle]I, II, and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Organic Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Organic Chemistry // question: 4522 name: ::AP 1999-29:: The organic compound represented below is an example of: ::\:\:AP 1999-29\:\: The organic compound represented below is an example of\:::[html]\:\:AP 1999-29\:\: The organic compound represented below is an example of\:

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{ ~[moodle]an organic acid ~[moodle]an alcohol ~[moodle]an ether ~[moodle]an aldehyde =[moodle]a ketone } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4477 name: ::AP 1999-30:: H2Se(g) + 4 O2F2(g) → SeF6(g) + 2 HF(g) + 4 O2(g) Which of the following is true regarding the reaction represented above? ::\:\:AP 1999-30\:\: H2Se(g) + 4 O2F2(g) → SeF6(g) + 2 HF(g) + 4 O2(g) Which of the following is true regarding the reaction represented above?::[html]\:\:AP 1999-30\:\:
H2Se(g) + 4 O2F2(g) → SeF6(g) + 2 HF(g) + 4 O2(g)

Which of the following is true regarding the reaction represented above?{ ~[moodle]The oxidation number of O does not change. ~[moodle]The oxidation number of H changes from -1 to +1. ~[moodle]The oxidation number of F changes from +1 to -1. =[moodle]The oxidation number of Se changes from -2 to +6. ~[moodle]It is a disproportionation reaction for F. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4314 name: ::AP 1999-31:: If the temperature of an aqueous solution of NaCl is increased from 20°C to 90°C which of the following statements is true? ::\:\:AP 1999-31\:\: If the temperature of an aqueous solution of NaCl is increased from 20°C to 90°C which of the following statements is true?::[html]\:\:AP 1999-31\:\: If the temperature of an aqueous solution of NaCl is increased from 20°C to 90°C which of the following statements is true?{ ~[moodle]The density of the solution remains unchanged. ~[moodle]The molarity of the solution remains unchanged. =[moodle]The molality of the solution remains unchanged. ~[moodle]The mole fraction of solute decreases. ~[moodle]The mole fraction of solute increases. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4160 name: ::AP 1999-32:: Types of hybridization exhibited by the C atoms in propene, CH3CHCH2, include which of the following? ::\:\:AP 1999-32\:\: Types of hybridization exhibited by the C atoms in propene, CH3CHCH2, include which of the following?::[html]\:\:AP 1999-32\:\: Types of hybridization exhibited by the C atoms in propene, CH3CHCH2, include which of the following?

{ ~[moodle]sp only ~[moodle]sp3 ~[moodle]sp and sp2 only =[moodle]sp2 and sp3 only ~[moodle]sp, sp2, and sp3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4052 name: ::AP 1999-33:: A 1.0 L sample of an aqueous solution contains 0.10 mol of NaCl and 0.10 mol of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order ... ::\:\:AP 1999-33\:\: A 1.0 L sample of an aqueous solution contains 0.10 mol of NaCl and 0.10 mol of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order ...::[html]\:\:AP 1999-33\:\: A 1.0 L sample of an aqueous solution contains 0.10 mol of NaCl and 0.10 mol of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl- as AgCl (s) ? (Assume that AgCl is insoluble.){ ~[moodle]0.10 mol ~[moodle]0.20 mol =[moodle]0.30 mol ~[moodle]0.40 mol ~[moodle]0.60 mol } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4478 name: ::AP 1999-34:: An electrolytic cell involves the following half-reaction: AlF63- + 3 e- → Al + 6 F- Which of the following occurs in the rea ::\:\:AP 1999-34\:\: An electrolytic cell involves the following half-reaction\: AlF63- + 3 e- → Al + 6 F- Which of the following occurs in the rea::[html]\:\:AP 1999-34\:\: An electrolytic cell involves the following half-reaction\:

AlF63- + 3 e- → Al + 6 F-

Which of the following occurs in the reaction?{ =[moodle]AlF63- is reduced at the cathode. ~[moodle]Al is oxidized at the anode. ~[moodle]Aluminum is converted from the -3 oxidation state to the 0 oxidation state. ~[moodle]F- acts as a reducing agent. ~[moodle]F- is reduced at the cathode. } // question: 4479 name: ::AP 1999-35:: An electrolytic cell involves the following half-reaction: AlF63- + 3 e- → Al + 6 F- A steady current of 10 amperes is passed ::\:\:AP 1999-35\:\: An electrolytic cell involves the following half-reaction\: AlF63- + 3 e- → Al + 6 F- A steady current of 10 amperes is passed::[html]\:\:AP 1999-35\:\: An electrolytic cell involves the following half-reaction\:

AlF63- + 3 e- → Al + 6 F-

A steady current of 10 amperes is passed through an aluminum-production cell for 15 minutes. Which of the following is the correct expression for calculating the number of grams of aluminum produced? (1 faraday \= 96,500 coulombs){ ~[moodle]f((10) (15) (96,500) / (27) (60)) g ~[moodle]f((10) (15) (27) / (60) (96,500)) g =[moodle]f((10) (15) (60) (27) / (96,500) (3)) g ~[moodle]f((96,500) (27) / (10) (15) (60) (3)) g ~[moodle]f((27) (3) / (96,500) (10) (15) (60)) g } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4368 name: ::AP 1999-36:: Experiment Initial [NO] (mol L-1) Initial [O2] (mol L-1) Initial Rate of Formation of NO2 (mol L-1s-1) ::\:\:AP 1999-36\:\: Experiment Initial [NO] (mol L-1) Initial [O2] (mol L-1) Initial Rate of Formation of NO2 (mol L-1s-1)::[html]\:\:AP 1999-36\:\:\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
Experiment\n Initial [NO] (mol L-1)\n Initial [O2] (mol L-1)\n Initial Rate of Formation of NO2 (mol L-1s-1)\n
1\n 0.10\n 0.10\n 2.5 - 10-4\n
2\n 0.20\n 0.10\n 5.0 - 10-4\n
3\n 0.20\n 0.40\n 8.0 - 10-3\n

The initial-rate data in the table above were obtained for the reaction represented below. What is the experimental rate law for the reaction?
2 NO (g) + O2 (g) → 2 NO2 (g)
{ ~[moodle]Rate \= k[NO][O2] =[moodle]Rate \= k[NO][O2]2 ~[moodle]Rate \= k[NO]2[O2] ~[moodle]Rate \= k[NO]2[O2]2 ~[moodle]Rate \= k f([NO],[O2]) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4125 name: ::AP 1999-37:: Ionization Energies for element X (kJ mol-1) First Second Third Fourth Fifth 580 1,815 2,740 ::\:\:AP 1999-37\:\: Ionization Energies for element X (kJ mol-1) First Second Third Fourth Fifth 580 1,815 2,740::[html]\:\:AP 1999-37\:\:\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
Ionization Energies for element X (kJ mol-1)
First\n Second\n Third\n Fourth\n Fifth\n
580\n 1,815\n 2,740\n 11,600\n 14,800\n

The ionization energies for element X are listed in the table above. On the basis of the data, element X is most likely to be{ ~[moodle]Na ~[moodle]Mg =[moodle]Al ~[moodle]Si ~[moodle]P } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4426 name: ::AP 1999-38:: A molecule or an ion is classified as a Lewis acid if it ::\:\:AP 1999-38\:\: A molecule or an ion is classified as a Lewis acid if it::[html]\:\:AP 1999-38\:\: A molecule or an ion is classified as a Lewis acid if it{ ~[moodle]accepts a proton from water =[moodle]accepts a pair of electrons to form a bond ~[moodle]donates a pair of electrons to form a bond ~[moodle]donates a proton to water ~[moodle]has resonance Lewis electron-dot structures } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4263 name: ::AP 1999-39:: The phase diagram for a pure substance is shown below. Which point on the diagram corresponds to the equilibrium between the solid and liquid phases at the normal melting point? ::\:\:AP 1999-39\:\: The phase diagram for a pure substance is shown below. Which point on the diagram corresponds to the equilibrium between the solid and liquid phases at the normal melting point?::[html]\:\:AP 1999-39\:\: The phase diagram for a pure substance is shown below.

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Which point on the diagram corresponds to the equilibrium between the solid and liquid phases at the normal melting point?
{ ~[moodle]A ~[moodle]B =[moodle]C ~[moodle]D ~[moodle]E } // question: 4264 name: ::AP 1999-40:: Of the following molecules, which has the largest dipole moment? ::\:\:AP 1999-40\:\: Of the following molecules, which has the largest dipole moment?::[html]\:\:AP 1999-40\:\: Of the following molecules, which has the largest dipole moment?{ ~[moodle]CO ~[moodle]CO2 ~[moodle]O2 =[moodle]HF ~[moodle]F2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4391 name: ::AP 1999-41:: 2 SO3 (g) ↔ 2 SO2 (g) + O2 (g) After the equilibrium represented above is established, some pure O2  ::\:\:AP 1999-41\:\: 2 SO3 (g) ↔ 2 SO2 (g) + O2 (g) After the equilibrium represented above is established, some pure O2 ::[html]\:\:AP 1999-41\:\:
2 SO3 (g) → 2 SO2 (g) + O2 (g)

After the equilibrium represented above is established, some pure O2 (g) is injected into the reaction vessel at constant temperature. After equilibrium is reestablished, which of the following has a lower value compared to its value at the original equilibrium?{ ~[moodle]Keq for the reaction ~[moodle]The total pressure in the reaction vessel ~[moodle]The amount of SO3 (g) in the reaction vessel ~[moodle]The amount of O2 (g) in the reaction vessel =[moodle]The amount of SO2(g) in the reaction vessel } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4053 name: ::AP 1999-42:: ... Li3N (s) + ... H2O (l) ... Li+ (aq) + ... OH- (aq) + ... NH3 (g) ::\:\:AP 1999-42\:\: ... Li3N (s) + ... H2O (l) ... Li+ (aq) + ... OH- (aq) + ... NH3 (g)::[html]\:\:AP 1999-42\:\:
... Li3N (s) + ... H2O (l) → ... Li+ (aq) + ... OH- (aq) + ... NH3 (g)

When the equation above is balanced and all coefficients reduced to lowest whole-number terms, the coefficient for OH- (aq) is{ ~[moodle]1 ~[moodle]2 =[moodle]3 ~[moodle]4 ~[moodle]6 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4315 name: ::AP 1999-43:: A sample of 61.8 g of H3BO3, a weak acid, is dissolved in 1,000 g of water to make a 1.0-molal solution. Which of the following would be the best procedure to determine the molarity ... ::\:\:AP 1999-43\:\: A sample of 61.8 g of H3BO3, a weak acid, is dissolved in 1,000 g of water to make a 1.0-molal solution. Which of the following would be the best procedure to determine the molarity ...::[html]\:\:AP 1999-43\:\: A sample of 61.8 g of H3BO3, a weak acid, is dissolved in 1,000 g of water to make a 1.0-molal solution. Which of the following would be the best procedure to determine the molarity of the solution? (Assume no additional information is available.){ ~[moodle]Titration of the solution with standard acid ~[moodle]Measurement of the pH with a pH meter ~[moodle]Determination of the boiling point of the solution =[moodle]Measurement of the total volume of the solution ~[moodle]Measurement of the specific heat of the solution } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3895 name: ::AP 1999-44:: A rigid metal tank contains oxygen gas. Which of the following applies to the gas in the tank when additional oxygen is added at constant temperature? ::\:\:AP 1999-44\:\: A rigid metal tank contains oxygen gas. Which of the following applies to the gas in the tank when additional oxygen is added at constant temperature?::[html]\:\:AP 1999-44\:\: A rigid metal tank contains oxygen gas. Which of the following applies to the gas in the tank when additional oxygen is added at constant temperature?{ ~[moodle]The volume of the gas increases. ~[moodle]The pressure of the gas decreases. =[moodle]The average speed of the gas molecules remains the same. ~[moodle]The total number of gas molecules remains the same. ~[moodle]The average distance between the gas molecules increases. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4420 name: ::AP 1999-45:: What is the H+ (aq) concentration in 0.05 M HCN (aq) ? (The Ka for HCN is 5.0 × 10-10.) ::\:\:AP 1999-45\:\: What is the H+ (aq) concentration in 0.05 M HCN (aq) ? (The Ka for HCN is 5.0 × 10-10.)::[html]\:\:AP 1999-45\:\: What is the H+ (aq) concentration in 0.05 M HCN (aq) ? (The Ka for HCN is 5.0 - 10-10.){ ~[moodle]2.5 × 10-11 M ~[moodle]2.5 × 10-10 M ~[moodle]5.0 × 10-10 M =[moodle]5.0 × 10-6 M ~[moodle]5.0 × 10-4 M } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3961 name: ::AP 1999-46:: Which of the following occurs when excess concentrated NH3 (aq) is mixed thoroughly with 0.1 M Cu(NO3)2 (aq)? ::\:\:AP 1999-46\:\: Which of the following occurs when excess concentrated NH3 (aq) is mixed thoroughly with 0.1 M Cu(NO3)2 (aq)?::[html]\:\:AP 1999-46\:\: Which of the following occurs when excess concentrated NH3 (aq) is mixed thoroughly with 0.1 M Cu(NO3)2 (aq)?{ ~[moodle]A dark red precipitate forms and settles out. ~[moodle]Separate layers of immiscible liquids form with a blue layer on top. =[moodle]The color of the solution turns from light blue to dark blue. ~[moodle]Bubbles of ammonia gas form. ~[moodle]The pH of the solution decreases. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4054 name: ::AP 1999-47:: When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula ... ::\:\:AP 1999-47\:\: When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula ...::[html]\:\:AP 1999-47\:\: When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula for this compound?{ ~[moodle]HfCl ~[moodle]HfCl2 =[moodle]HfCl3 ~[moodle]HfCl4 ~[moodle]Hf2Cl3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4504 name: ::AP 1999-48:: If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I? ::\:\:AP 1999-48\:\: If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?::[html]\:\:AP 1999-48\:\: If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?{ ~[moodle]6 days =[moodle]8 days ~[moodle]12 days ~[moodle]14 days ~[moodle]21 days } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3962 name: ::AP 1999-49:: Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3? ::\:\:AP 1999-49\:\: Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3?::[html]\:\:AP 1999-49\:\: Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3?{ ~[moodle]Paper chromatography ~[moodle]Filtration ~[moodle]Titration ~[moodle]Electrolysis =[moodle]Evaporation to dryness } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4126 name: ::AP 1999-50:: In the periodic table, as the atomic number increases from 11 to 17, what happens to the atomic radius? ::\:\:AP 1999-50\:\: In the periodic table, as the atomic number increases from 11 to 17, what happens to the atomic radius?::[html]\:\:AP 1999-50\:\: In the periodic table, as the atomic number increases from 11 to 17, what happens to the atomic radius?{ ~[moodle]It remains constant. ~[moodle]It increases only. ~[moodle]It increases, then decreases. =[moodle]It decreases only. ~[moodle]It decreases, then increases. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4569 name: ::AP 1999-51:: Which of the following is a correct interpretation of the results of Rutherford's experiments in which gold atoms were bombarded with alpha particles? ::\:\:AP 1999-51\:\: Which of the following is a correct interpretation of the results of Rutherford's experiments in which gold atoms were bombarded with alpha particles?::[html]\:\:AP 1999-51\:\: Which of the following is a correct interpretation of the results of Rutherford's experiments in which gold atoms were bombarded with alpha particles?{ ~[moodle]Atoms have equal numbers of positive and negative charges. ~[moodle]Electrons in atoms are arranged in shells. ~[moodle]Neutrons are at the center of an atom. ~[moodle]Neutrons and protons in atoms have nearly equal mass. =[moodle]The positive charge of an atom is concentrated in a small region. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4316 name: ::AP 1999-52:: Under which of the following sets of conditions could the most O2 (g) be dissolved in H2O (l)? ::\:\:AP 1999-52\:\: Under which of the following sets of conditions could the most O2 (g) be dissolved in H2O (l)?::[html]\:\:AP 1999-52\:\: Under which of the following sets of conditions could the most O2 (g) be dissolved in H2O (l)?{ ~[moodle]PO2 =[moodle]5.0 atm; TH2O =[moodle]80°C =[moodle]PO2 =[moodle]5.0 atm; TH2O =[moodle]20°C ~[moodle]PO2 =[moodle]1.0 atm; TH2O =[moodle]80°C ~[moodle]PO2 =[moodle]1.0 atm; TH2O =[moodle]20°C ~[moodle]PO2 =[moodle]0.5 atm; TH2O =[moodle]20°C } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3896 name: ::AP 1999-53:: W (g) + X (g) → Y (g) + Z (g) Gases W and X react in a closed, rigid vessel to form gases Y and Z according to the equation above. The initial p ::\:\:AP 1999-53\:\: W (g) + X (g) → Y (g) + Z (g) Gases W and X react in a closed, rigid vessel to form gases Y and Z according to the equation above. The initial p::[html]\:\:AP 1999-53\:\:
W (g) + X (g) → Y (g) + Z (g)

Gases W and X react in a closed, rigid vessel to form gases Y and Z according to the equation above. The initial pressure of W (g) is 1.20 atm and that of X (g) is 1.60 atm. No Y (g) or Z (g) is initially present. The experiment is carried out at constant temperature. What is the partial pressure of Z(g) when the partial pressure of W (g) has decreased to 1.0 atm?{ =[moodle]0.20 atm ~[moodle]0.40 atm ~[moodle]l.0 atm ~[moodle]1.2 atm ~[moodle]l.4 atm } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4392 name: ::AP 1999-54:: 2 NO (g) + O2 (g) → 2 NO2 (g)     ΔH < 0 Which of the following changes alone would cause a decre ::\:\:AP 1999-54\:\: 2 NO (g) + O2 (g) → 2 NO2 (g)     ΔH < 0 Which of the following changes alone would cause a decre::[html]\:\:AP 1999-54\:\:
2 NO (g) + O2 (g) → 2 NO2 (g) ΔH < 0

Which of the following changes alone would cause a decrease in the value of Keq for the reaction represented above?{ ~[moodle]Decreasing the temperature =[moodle]Increasing the temperature ~[moodle]Decreasing the volume of the reaction vessel ~[moodle]Increasing the volume of the reaction vessel ~[moodle]Adding a catalyst } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4055 name: ::AP 1999-55:: 10 HI + 2 KMnO4 + 3 H2SO4 → 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O According to the balanc ::\:\:AP 1999-55\:\: 10 HI + 2 KMnO4 + 3 H2SO4 → 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O According to the balanc::[html]\:\:AP 1999-55\:\:
10 HI + 2 KMnO4 + 3 H2SO4 → 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O

According to the balanced equation above, how many moles of HI would be necessary to produce 2.5 mol of I2, starting with 4.0 mol of KMnO4 and 3.0 mol of H2SO4?{ ~[moodle]20. ~[moodle]10. ~[moodle]8.0 =[moodle]5.0 ~[moodle]2.5 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3958 name: ::AP 1999-56:: A yellow precipitate forms when 0.5 M NaI (aq) is added to a 0.5 M solution of which of the following ions? ::\:\:AP 1999-56\:\: A yellow precipitate forms when 0.5 M NaI (aq) is added to a 0.5 M solution of which of the following ions?::[html]\:\:AP 1999-56\:\: A yellow precipitate forms when 0.5 M NaI (aq) is added to a 0.5 M solution of which of the following ions?{ =[moodle]Pb2+ (aq) ~[moodle]Zn2+ (aq) ~[moodle]CrO42- (aq) ~[moodle]SO42- (aq) ~[moodle]OH- (aq) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4480 name: ::AP 1999-57:: M (s) + 3 Ag+ (aq) → 3 Ag (s) + M3+  (aq)    Eo = +2.46 V Ag+ ::\:\:AP 1999-57\:\: M (s) + 3 Ag+ (aq) → 3 Ag (s) + M3+  (aq)    Eo \= +2.46 V Ag+::[html]\:\:AP 1999-57\:\:
M (s) + 3 Ag+ (aq) → 3 Ag (s) + M3+ (aq) Eo \= +2.46 V

Ag+ (aq) + e- → Ag (s) Eo \= +0.80 V

According to the information above, what is the standard reduction potential for the half-reaction M3+ (aq) + 3 e- → M (s) ?{ =[moodle]-1.66 V ~[moodle]-0.06 V ~[moodle]0.06 V ~[moodle]1.66 V ~[moodle]3.26 V } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3897 name: ::AP 1999-58:: On a mountaintop, it is observed that water boils at 90°C not at 100°C as at sea level. This phenomenon occurs because on the mountaintop the ::\:\:AP 1999-58\:\: On a mountaintop, it is observed that water boils at 90°C not at 100°C as at sea level. This phenomenon occurs because on the mountaintop the::[html]\:\:AP 1999-58\:\: On a mountaintop, it is observed that water boils at 90°C not at 100°C as at sea level. This phenomenon occurs because on the mountaintop the{ ~[moodle]equilibrium water vapor pressure is higher due to the higher atmospheric pressure ~[moodle]equilibrium water vapor pressure is lower due to the higher atmospheric pressure =[moodle]equilibrium water vapor pressure equals the atmospheric pressure at a lower temperature ~[moodle]water molecules have a higher average kinetic energy due to the lower atmospheric pressure ~[moodle]water contains a greater concentration of dissolved gases } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4317 name: ::AP 1999-59:: A 40.0 mL sample of 0.25 M KOH is added to 60.0 mL of 0.15 M Ba(OH)2. What is the molar concentration of OH- (aq) in the resulting solution? (Assume that the volumes ... ::\:\:AP 1999-59\:\: A 40.0 mL sample of 0.25 M KOH is added to 60.0 mL of 0.15 M Ba(OH)2. What is the molar concentration of OH- (aq) in the resulting solution? (Assume that the volumes ...::[html]\:\:AP 1999-59\:\: A 40.0 mL sample of 0.25 M KOH is added to 60.0 mL of 0.15 M Ba(OH)2. What is the molar concentration of OH- (aq) in the resulting solution? (Assume that the volumes are additive.){ ~[moodle]0.10 M ~[moodle]0.19 M =[moodle]0.28 M ~[moodle]0.40 M ~[moodle]0.55 M } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3898 name: ::AP 1999-60:: NH4NO3 (s) → N2O (g) + 2 H2O (g) A 0.03 mol sample of NH4NO3 (s) is ::\:\:AP 1999-60\:\: NH4NO3 (s) → N2O (g) + 2 H2O (g) A 0.03 mol sample of NH4NO3 (s) is::[html]\:\:AP 1999-60\:\:
NH4NO3 (s) → N2O (g) + 2 H2O (g)

A 0.03 mol sample of NH4NO3 (s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3 (s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following? (The value of the gas constant, R, is 0.082 L atm mol-1 K-1.){ =[moodle]3 atm ~[moodle]1 atm ~[moodle]0.5 atm ~[moodle]0.1 atm ~[moodle]0.03 atm } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4210 name: ::AP 1999-61:: C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (g) For the reaction of ethylene r ::\:\:AP 1999-61\:\: C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (g) For the reaction of ethylene r::[html]\:\:AP 1999-61\:\:
C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (g)

For the reaction of ethylene represented above, ΔH is -1,323 kJ. What is the value of ΔH if the combustion produced liquid water H2O (l), rather than water vapor H2O (g) ? (ΔH for the phase change H2O (g) → H2O (l) is -44 kJ mol-1.){ ~[moodle]-1,235 kJ ~[moodle]-1,279 kJ ~[moodle]-1,323 kJ ~[moodle]-1,367 kJ =[moodle]-1,411 kJ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4421 name: ::AP 1999-62:: HC2H3O2 (aq) + CN- (aq) → HCN (aq) + C2H3O2- (aq) The re ::\:\:AP 1999-62\:\: HC2H3O2 (aq) + CN- (aq) → HCN (aq) + C2H3O2- (aq) The re::[html]\:\:AP 1999-62\:\:
HC2H3O2 (aq) + CN- (aq) → HCN (aq) + C2H3O2- (aq)

The reaction represented above has an equilibrium constant equal to 3.7 - 104. Which of the following can be concluded from this information?{ =[moodle]CN- (aq) is a stronger base than C2H3O2- (aq). ~[moodle]HCN (aq) is a stronger acid than HC2H3O2 (aq). ~[moodle]The conjugate base of CN- (aq) is C2H3O2- (aq). ~[moodle]The equilibrium constant will increase with an increase in temperature. ~[moodle]The pH of a solution containing equimolar amounts of CN- (aq) and HC2H3O2 (aq) is 7.0. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4367 name: ::AP 1999-63:: The graph below shows the results of a study of the reaction of X with a large excess of Y to yield Z. The concentrations of X and Y were measured over a period of time. According to the ... ::\:\:AP 1999-63\:\: The graph below shows the results of a study of the reaction of X with a large excess of Y to yield Z. The concentrations of X and Y were measured over a period of time. According to the ...::[html]\:\:AP 1999-63\:\: The graph below shows the results of a study of the reaction of X with a large excess of Y to yield Z. The concentrations of X and Y were measured over a period of time.

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The substance is at its normal freezing point at which time?
{ ~[moodle]t1 =[moodle]t2 ~[moodle]t3 ~[moodle]t4 ~[moodle]t5 } // question: 4203 name: ::AP 2002-16:: The graph below shows the temperature of a pure substance as it is heated at a constant rate in an open vessel at 1.0 atm pressure. The substance changes from the solid to the liquid ... ::\:\:AP 2002-16\:\: The graph below shows the temperature of a pure substance as it is heated at a constant rate in an open vessel at 1.0 atm pressure. The substance changes from the solid to the liquid ...::[html]\:\:AP 2002-16\:\: The graph below shows the temperature of a pure substance as it is heated at a constant rate in an open vessel at 1.0 atm pressure. The substance changes from the solid to the liquid to the gas phase.

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Which of the following best describes what happens to the substance between t4 and t5?{ =[moodle]The molecules are leaving the liquid phase. ~[moodle]The solid and liquid phases coexist in equilibrium. ~[moodle]The vapor pressure of the substance is decreasing. ~[moodle]The average intermolecular distance is decreasing. ~[moodle]The temperature of the substance is increasing. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4567 name: ::AP 2002-17:: In which of the following groups are the three species isoelectronic; i.e., have the same number of electrons? ::\:\:AP 2002-17\:\: In which of the following groups are the three species isoelectronic; i.e., have the same number of electrons?::[html]\:\:AP 2002-17\:\: In which of the following groups are the three species isoelectronic; i.e., have the same number of electrons?{ =[moodle]S2-, K+, Ca2+ ~[moodle]Sc, Ti, V2+ ~[moodle]O2-, S2-, Cl ~[moodle]Mg2+, Ca2+, Sr2+ ~[moodle]Cs, Ba2+, La3+ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4252 name: ::AP 2002-18:: The phase diagram for the pure substance X is shown above. The temperature of a sample of pure solid X is slowly raised from 10°C to 100°C at a constant pressure of 0.5 atm.... ::\:\:AP 2002-18\:\: The phase diagram for the pure substance X is shown above. The temperature of a sample of pure solid X is slowly raised from 10°C to 100°C at a constant pressure of 0.5 atm....::[html]\:\:AP 2002-18\:\: The phase diagram for the pure substance X is shown below.

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I. 1 M NH3 (aq)
II. Zn (s)
III. NaHCO3 (s){ ~[moodle]I only =[moodle]II only ~[moodle]III only ~[moodle]I and II only ~[moodle]I, II, and III } // question: 3965 name: ::AP 2002-22:: In liquid ammonia, the following reaction occurs. 2 NH3 → NH4+ + NH2- In this reaction, NH4+ acts as ::\:\:AP 2002-22\:\: In liquid ammonia, the following reaction occurs. 2 NH3 → NH4+ + NH2- In this reaction, NH4+ acts as::[html]\:\:AP 2002-22\:\: In liquid ammonia, the following reaction occurs.

2 NH3 → NH4+ + NH2-

In this reaction, NH4+ acts as{ ~[moodle]a catalyst ~[moodle]both an acid and a base =[moodle]the conjugate acid of NH3 ~[moodle]the reducing agent ~[moodle]the oxidizing agent } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4506 name: ::AP 2002-23:: Neutron bombardment of uranium can induce the following reaction: 23592U + 10n → 14155Cs + 3 10n + X ::\:\:AP 2002-23\:\: Neutron bombardment of uranium can induce the following reaction\: 23592U + 10n → 14155Cs + 3 10n + X::[html]\:\:AP 2002-23\:\: Neutron bombardment of uranium can induce the following reaction\:

23592U + 10n → 14155Cs + 3 10n + X

Nuclide X is which of the following?{ ~[moodle]9235Br ~[moodle]9435Br ~[moodle]9137Rb =[moodle]9237Rb ~[moodle]9437Rb } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4043 name: ::AP 2002-24:: A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of 0. What is the simplest formula of this compound? ::\:\:AP 2002-24\:\: A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of 0. What is the simplest formula of this compound?::[html]\:\:AP 2002-24\:\: A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of 0. What is the simplest formula of this compound?{ ~[moodle]KTeO ~[moodle]KTe2O =[moodle]K2TeO3 ~[moodle]K2TeO6 ~[moodle]K4TeO6 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4204 name: ::AP 2002-25:: 3 C2H2(g) → C6H6(g) What is the standard enthalpy change, ΔH°, for the reaction represented above? (ΔH& ::\:\:AP 2002-25\:\: 3 C2H2(g) → C6H6(g) What is the standard enthalpy change, ΔH°, for the reaction represented above? (ΔH&::[html]\:\:AP 2002-25\:\:
3 C2H2(g) → C6H6(g)

What is the standard enthalpy change, ΔH°, for the reaction represented above?
H°f C2H2(g) \= 230 kJ mol-1; ΔH°f C6H6(g) \= 83 kJ mol-1){ =[moodle]-607 kJ ~[moodle]-147 kJ ~[moodle]-19 kJ ~[moodle]+19 kJ ~[moodle]+773 kJ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4044 name: ::AP 2002-26:: Approximately what mass of CuSO4·5H2O (250 g mol-1) is required to prepare 250 mL of 0.10 M copper (II) sulfate solution? ::\:\:AP 2002-26\:\: Approximately what mass of CuSO4·5H2O (250 g mol-1) is required to prepare 250 mL of 0.10 M copper (II) sulfate solution?::[html]\:\:AP 2002-26\:\: Approximately what mass of CuSO4·5H2O (250 g mol-1) is required to prepare 250 mL of 0.10 M copper (II) sulfate solution?{ ~[moodle]4.0 g =[moodle]6.2 g ~[moodle]34 g ~[moodle]85 g ~[moodle]140 g } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4362 name: ::AP 2002-27:: 2 NO(g) + O2(g) → 2 NO2(g) A possible mechanism for the overall reaction represented above is the following: (1)   NO(g) + NO ::\:\:AP 2002-27\:\: 2 NO(g) + O2(g) → 2 NO2(g) A possible mechanism for the overall reaction represented above is the following\: (1)   NO(g) + NO::[html]\:\:AP 2002-27\:\:
2 NO(g) + O2(g) → 2 NO2(g)

A possible mechanism for the overall reaction represented above is the following\:

(1)   NO(g) + NO(g) → N2O2(g)    slow
(2)   N2O2(g) + O2(g) → 2 NO2(g)    fast

Which of the following rate expressions agrees best with this possible mechanism?{ =[moodle]Rate \= k[NO]2 ~[moodle]Rate \= k ~[moodle]Rate \= k ~[moodle]Rate \= k[NO]2[O2] ~[moodle]Rate \= k[N2O2][O2] } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4253 name: ::AP 2002-28:: Of the following compounds, which is the most ionic? ::\:\:AP 2002-28\:\: Of the following compounds, which is the most ionic?::[html]\:\:AP 2002-28\:\: Of the following compounds, which is the most ionic?{ ~[moodle]SiCl4 ~[moodle]BrCl ~[moodle]PCl3 ~[moodle]Cl2O =[moodle]CaCl2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4156 name: ::AP 2002-29:: The best explanation for the fact that diamond is extremely hard is that diamond crystals ::\:\:AP 2002-29\:\: The best explanation for the fact that diamond is extremely hard is that diamond crystals::[html]\:\:AP 2002-29\:\: The best explanation for the fact that diamond is extremely hard is that diamond crystals{ ~[moodle]are made up of atoms that are intrinsically hard because of their electronic structures ~[moodle]consist of positive and negative ions that are strongly attracted to each other =[moodle]are giant molecules in which each atom forms strong covalent bonds with all of its neighboring atoms ~[moodle]are formed under extreme conditions of tem ~[moodle]contain orbitals or bands of delocalized elec } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4428 name: ::AP 2002-30:: At 25°C aqueous solutions with a pH of 8 have a hydroxide ion concentration, [OH-], of ::\:\:AP 2002-30\:\: At 25°C aqueous solutions with a pH of 8 have a hydroxide ion concentration, [OH-], of::[html]\:\:AP 2002-30\:\: At 25°C aqueous solutions with a pH of 8 have a hydroxide ion concentration, [OH-], of{ ~[moodle]1 × 10-14 M ~[moodle]1 × 10-8 M =[moodle]1 × 10-6 M ~[moodle]1 M ~[moodle]8 M } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3891 name: ::AP 2002-31:: CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g) What volume of O2(g) is required to react with excess CS2( ::\:\:AP 2002-31\:\: CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g) What volume of O2(g) is required to react with excess CS2(::[html]\:\:AP 2002-31\:\:
CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g)

What volume of O2(g) is required to react with excess CS2(l) to produce 4.0 L of CO2(g)? (Assume all gases are measured at 0°C and 1 atm.){ =[moodle]12 L ~[moodle]22.4 L ~[moodle]1/3 × 22.4 L ~[moodle]2 × 22.4 L ~[moodle]3 × 22.4 L } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4121 name: ::AP 2002-32:: Which of the following oxides is a gas at 25°C and 1 atm? ::\:\:AP 2002-32\:\: Which of the following oxides is a gas at 25°C and 1 atm?::[html]\:\:AP 2002-32\:\: Which of the following oxides is a gas at 25°C and 1 atm?{ ~[moodle]Rb2O =[moodle]N2O ~[moodle]Na2O2 ~[moodle]SiO2 ~[moodle]La2O3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4427 name: ::AP 2002-33:: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH. Which of the following indicators is the best choice ... ::\:\:AP 2002-33\:\: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH. Which of the following indicators is the best choice ...::[html]\:\:AP 2002-33\:\: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH.

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Which of the following indicators is the best choice for this titration?{ ~[moodle]Methyl orange (pH range of color change 3.2 - 4.4) ~[moodle]Methyl red (pH range of color change 4.8 - 6.0) ~[moodle]Bromothymol blue (pH range of color change 6.1 - 7.6) =[moodle]Phenolphthalein (pH range of color change 8.2 - 10.0) ~[moodle]Alizarin (pH range of color change 11.0 - 12.4) } // question: 4416 name: ::AP 2002-34:: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH. What part of the curve corresponds to the optimum ... ::\:\:AP 2002-34\:\: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH. What part of the curve corresponds to the optimum ...::[html]\:\:AP 2002-34\:\: The graph below shows the titration curve that results when 100. mL of 0.0250 M acetic acid is titrated with 0.100 M NaOH.

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What part of the curve corresponds to the optimum buffer action for the acetic acid/acetate ion pair?{ =[moodle]Point V ~[moodle]Point X ~[moodle]Point Z ~[moodle]Along all of section WY ~[moodle]Along all of section YZ } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4322 name: ::AP 2002-35:: A solution is made by dissolving a nonvolatile solute in a pure solvent. Compared to the pure solvent, the solution ::\:\:AP 2002-35\:\: A solution is made by dissolving a nonvolatile solute in a pure solvent. Compared to the pure solvent, the solution::[html]\:\:AP 2002-35\:\: A solution is made by dissolving a nonvolatile solute in a pure solvent. Compared to the pure solvent, the solution{ =[moodle]has a higher normal boiling point ~[moodle]has a higher vapor pressure ~[moodle]has the same vapor pressure ~[moodle]has a higher freezing point ~[moodle]is more nearly ideal } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3966 name: ::AP 2002-36:: A sample of a solution of an unknown was treated with dilute hydrochloric acid. The white precipitate formed was filtered and washed with hot water. A few drops of potassium iodide solution ... ::\:\:AP 2002-36\:\: A sample of a solution of an unknown was treated with dilute hydrochloric acid. The white precipitate formed was filtered and washed with hot water. A few drops of potassium iodide solution ...::[html]\:\:AP 2002-36\:\: A sample of a solution of an unknown was treated with dilute hydrochloric acid. The white precipitate formed was filtered and washed with hot water. A few drops of potassium iodide solution were added to the hot water filtrate and a bright yellow precipitate was produced. The white precipitate remaining on the filter paper was readily soluble in ammonia solution. What two ions could have been present in the unknown?{ ~[moodle]Ag+(aq) and Hg22+(aq) =[moodle]Ag+(aq) and Pb2+(aq) ~[moodle]Ba2+(aq) and Ag+(aq) ~[moodle]Ba2+(aq) and Hg22+(aq) ~[moodle]Ba2+(aq) and Pb2+(aq) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4389 name: ::AP 2002-37:: HCO3-(aq) + OH-(aq) &#harr; H2O(l) + CO32-(aq)      ΔH = -41.4 kJ When th ::\:\:AP 2002-37\:\: HCO3-(aq) + OH-(aq) &\#harr; H2O(l) + CO32-(aq)      ΔH \= -41.4 kJ When th::[html]\:\:AP 2002-37\:\:
HCO3-(aq) + OH-(aq) → H2O(l) + CO32-(aq)      ΔH \= -41.4 kJ

When the reaction represented by the equation above is at equilibrium at 1 atm and 25°C, the ratio of [CO3-2] to [HCO3-] can be increased by doing which of the following?{ =[moodle]Decreasing the temperature ~[moodle]Adding acid ~[moodle]Adding a catalyst ~[moodle]diluting the solution with distilled water ~[moodle]Bubbling neon gas through the solution } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3963 name: ::AP 2002-38:: A 0.10 M aqueous solution of sodium sulfate, Na2SO4, is a better conductor of electricity than 0.10 M aqueous solution of sodium chloride, NaCl. Which of the following best explains ... ::\:\:AP 2002-38\:\: A 0.10 M aqueous solution of sodium sulfate, Na2SO4, is a better conductor of electricity than 0.10 M aqueous solution of sodium chloride, NaCl. Which of the following best explains ...::[html]\:\:AP 2002-38\:\: A 0.10 M aqueous solution of sodium sulfate, Na2SO4, is a better conductor of electricity than 0.10 M aqueous solution of sodium chloride, NaCl. Which of the following best explains this observation?{ ~[moodle]Na2SO4 is more soluble water than NaCl is. ~[moodle]Na2SO4 has a higher molar mass than NaCl has. ~[moodle]To prepare a given volume of 0.10 M solution, the mass of Na2SO4 needed is more than twice the mass of NaCl needed. =[moodle]More moles of ions are present in a given volume of 0.10 M Na2SO4 than in the same volume of 0.10 M NaCl. ~[moodle]The degree of dissociation of Na2SO4 in solution is significantly greater than that of NaCl. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4323 name: ::AP 2002-39:: On the basis of the solubility curves shown above, the greatest percentage of which compound can be recovered by cooling a saturated solution of that compound from 90°C to 30°C? ::\:\:AP 2002-39\:\: On the basis of the solubility curves shown above, the greatest percentage of which compound can be recovered by cooling a saturated solution of that compound from 90°C to 30°C?::[html]\:\:AP 2002-39\:\: On the basis of the solubility curves shown below, the greatest percentage of which compound can be recovered by cooling a saturated solution of that compound from 90°C to 30°C?

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{ ~[moodle]NaCl =[moodle]KNO3 ~[moodle]K2CrO4 ~[moodle]K2SO4 ~[moodle]Ce2(SO4)3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4045 name: ::AP 2002-40:: An excess of Mg(s) is added to 100. mL of 0.400 M HCl. At 0°C and 1 atm pressure, what volume of H2 gas can be obtained? ::\:\:AP 2002-40\:\: An excess of Mg(s) is added to 100. mL of 0.400 M HCl. At 0°C and 1 atm pressure, what volume of H2 gas can be obtained?::[html]\:\:AP 2002-40\:\: An excess of Mg(s) is added to 100. mL of 0.400 M HCl. At 0°C and 1 atm pressure, what volume of H2 gas can be obtained?{ ~[moodle]22.4 mL ~[moodle]44.8 mL ~[moodle]224 mL =[moodle]448 mL ~[moodle]896 mL } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4205 name: ::AP 2002-41:: When solid NH4SCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas is produced. Which of the following is true of ΔG, ΔH, and ΔS for the .. ::\:\:AP 2002-41\:\: When solid NH4SCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas is produced. Which of the following is true of ΔG, ΔH, and ΔS for the ..::[html]\:\:AP 2002-41\:\: When solid NH4SCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas is produced. Which of the following is true of ΔG, ΔH, and ΔS for the process?{ ~[moodle]ΔG < 0; ΔH < 0; ΔS < 0; ~[moodle]ΔG < 0; ΔH > 0; ΔS < 0; =[moodle]ΔG < 0; ΔH > 0; ΔS > 0; ~[moodle]ΔG > 0; ΔH < 0; ΔS > 0; ~[moodle]ΔG > 0; ΔH < 0; ΔS < 0; } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4390 name: ::AP 2002-42:: At a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 - 105. What is the value of K for the reverse reaction at the same temperature? ::\:\:AP 2002-42\:\: At a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 - 105. What is the value of K for the reverse reaction at the same temperature?::[html]
H2(g) + Br2(g) → 2 HBr(g)

At a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 - 105. What is the value of K for the reverse reaction at the same temperature?{ ~[moodle]-2.0 × 10-5 =[moodle]5.0 × 10-6 ~[moodle]2.0 × 10-5 ~[moodle]5.0 × 10-5 ~[moodle]5.0 × 10-4 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4568 name: ::AP 2002-43:: The atomic mass of copper is 63.55. Given that there are only two naturally occurring isotopes of copper, 63Cu and 65Cu, the natural abundance of the 65Cu isotope must be approximately ::\:\:AP 2002-43\:\: The atomic mass of copper is 63.55. Given that there are only two naturally occurring isotopes of copper, 63Cu and 65Cu, the natural abundance of the 65Cu isotope must be approximately::[html]\:\:AP 2002-43\:\: The atomic mass of copper is 63.55. Given that there are only two naturally occurring isotopes of copper, 63Cu and 65Cu, the natural abundance of the 65Cu isotope must be approximately{ ~[moodle]90% ~[moodle]70% ~[moodle]50% =[moodle]25% ~[moodle]10% } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4122 name: ::AP 2002-44:: Which of the following properties generally decreases across the periodic table from sodium to chlorine? ::\:\:AP 2002-44\:\: Which of the following properties generally decreases across the periodic table from sodium to chlorine?::[html]\:\:AP 2002-44\:\: Which of the following properties generally decreases across the periodic table from sodium to chlorine?{ ~[moodle]First ionization energy ~[moodle]Atomic mass ~[moodle]Electronegativity ~[moodle]Maximum value of oxidation number =[moodle]Atomic radius } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4320 name: ::AP 2002-45:: What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46 percent ethanol by mass? (The molar mass of C2H5OH is 46 g; the molar mass of H2O is 18 g.) ::\:\:AP 2002-45\:\: What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46 percent ethanol by mass? (The molar mass of C2H5OH is 46 g; the molar mass of H2O is 18 g.)::[html]\:\:AP 2002-45\:\: What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46 percent ethanol by mass? (The molar mass of C2H5OH is 46 g; the molar mass of H2O is 18 g.){ =[moodle]0.25 ~[moodle]0.46 ~[moodle]0.54 ~[moodle]0.67 ~[moodle]0.75 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4123 name: ::AP 2002-46:: The effective nuclear charge experienced by the outermost electron of Na is different than the effective nuclear charge experienced by the outermost electron of Ne. This difference best ... ::\:\:AP 2002-46\:\: The effective nuclear charge experienced by the outermost electron of Na is different than the effective nuclear charge experienced by the outermost electron of Ne. This difference best ...::[html]\:\:AP 2002-46\:\: The effective nuclear charge experienced by the outermost electron of Na is different than the effective nuclear charge experienced by the outermost electron of Ne. This difference best accounts for which of the following?{ ~[moodle]Na has a greater density at standard conditions than Ne. =[moodle]Na has a lower first ionization energy than Ne. ~[moodle]Na has a higher melting point than Ne. ~[moodle]Na has a higher neutron-to-proton ratio than Ne. ~[moodle]Na has fewer naturally occurring isotopes than Ne. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4363 name: ::AP 2002-47:: Which of the following is a correct statement about reaction order? ::\:\:AP 2002-47\:\: Which of the following is a correct statement about reaction order?::[html]\:\:AP 2002-47\:\: Which of the following is a correct statement about reaction order?{ ~[moodle]Reaction order can only be a whole number. ~[moodle]Reaction order can be determined only from the coefficients of the balanced equation for the reaction. =[moodle]Reaction order can be determined only by experiment. ~[moodle]Reaction order increases with increasing temperature. ~[moodle]A second-order reaction must involve at least two different compounds as reactants. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4254 name: ::AP 2002-48:: Sodium chloride is LEAST soluble in which of the following liquids? ::\:\:AP 2002-48\:\: Sodium chloride is LEAST soluble in which of the following liquids?::[html]\:\:AP 2002-48\:\: Sodium chloride is LEAST soluble in which of the following liquids?{ ~[moodle]H2O =[moodle]CCl4 ~[moodle]HF ~[moodle]CH3OH ~[moodle]CH3COOH } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4046 name: ::AP 2002-49:: ... Cr2O72-(aq) + .. . H2S(g) + ... H+(aq) → ... Cr3+(aq) + ... S(s) + ... H2O(l) ::\:\:AP 2002-49\:\: ... Cr2O72-(aq) + .. . H2S(g) + ... H+(aq) → ... Cr3+(aq) + ... S(s) + ... H2O(l)::[html]\:\:AP 2002-49\:\:
... Cr2O72-(aq) + .. . H2S(g) + ... H+(aq) → ... Cr3+(aq) + ... S(s) + ... H2O(l)

When the equation above is correctly balanced and all coefficients are reduced to lowest whole-number terms, the coefficient for H+(aq) is{ ~[moodle]2 ~[moodle]4 ~[moodle]6 =[moodle]8 ~[moodle]14 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4534 name: ::AP 2002-50:: Which of the following represents acceptable laboratory practice? ::\:\:AP 2002-50\:\: Which of the following represents acceptable laboratory practice?::[html]\:\:AP 2002-50\:\: Which of the following represents acceptable laboratory practice?{ ~[moodle]Placing a hot object on a balance pan ~[moodle]Using distilled water for the final rinse of a buret before filling it with standardized solution =[moodle]Adding a weighed quantity of solid acid to a titration flask wet with distilled water ~[moodle]Using 10 mL of standard strength phenolphthalein indicator solution for titration of 25 mL of acid solution ~[moodle]Diluting a solution in a volumetric flask to its final concentration with hot water } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4475 name: ::AP 2002-51:: 3 Cu(s) + 8 H+(aq) + 2 NO3-(aq) → 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l) True statements about the reaction represented ::\:\:AP 2002-51\:\: 3 Cu(s) + 8 H+(aq) + 2 NO3-(aq) → 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l) True statements about the reaction represented::[html]\:\:AP 2002-51\:\:
3 Cu(s) + 8 H+(aq) + 2 NO3-(aq) → 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l)

True statements about the reaction represented above include which of the following?

I. Cu(s) acts as an oxidizing agent.
II. The oxidation state of nitrogen changes from +5 to +2.
III.{ ~[moodle]I only =[moodle]II only ~[moodle]III only ~[moodle]I and II ~[moodle]II and III } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4047 name: ::AP 2002-52:: Propane gas, C3H8, burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient ... ::\:\:AP 2002-52\:\: Propane gas, C3H8, burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient ...::[html]\:\:AP 2002-52\:\: Propane gas, C3H8, burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O2 is{ ~[moodle]4 =[moodle]5 ~[moodle]7 ~[moodle]10 ~[moodle]22 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4157 name: ::AP 2002-53:: According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3, and H2O is best accounted for by the ::\:\:AP 2002-53\:\: According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3, and H2O is best accounted for by the::[html]\:\:AP 2002-53\:\: According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3, and H2O is best accounted for by the{ ~[moodle]increasing strength of the bonds ~[moodle]decreasing size of the central atom ~[moodle]increasing electronegativity of the central atom =[moodle]increasing number of unshared pairs of electrons ~[moodle]decreasing repulsion between hydrogen atoms } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4364 name: ::AP 2002-54:: Which of the following must be true for a reaction for which the activation energy is the same for both the forward and the reverse reactions? ::\:\:AP 2002-54\:\: Which of the following must be true for a reaction for which the activation energy is the same for both the forward and the reverse reactions?::[html]\:\:AP 2002-54\:\: Which of the following must be true for a reaction for which the activation energy is the same for both the forward and the reverse reactions?{ ~[moodle]A catalyst is present. ~[moodle]The reaction order can be obtained directly from the balanced equation. ~[moodle]The reaction order is zero. =[moodle]ΔH for the reaction is zero. ~[moodle]ΔS for the reaction is zero. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4505 name: ::AP 2002-55:: Time (days) 0 1 2 3 4 5 6 7 ... 10 ... 20 % Reactant Remaining ::\:\:AP 2002-55\:\: Time (days) 0 1 2 3 4 5 6 7 ... 10 ... 20 % Reactant Remaining::[html]\:\:AP 2002-55\:\:\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
 Time (days)\n % Reactant Remaining\n 0\n 1\n 2\n 3\n 4\n 5\n 6\n 7\n ...\n 10\n ...\n 20\n 100\n 79\n 63\n 50\n 40\n 31\n 25\n 20\n ...\n 10\n ...\n 1\n

A reaction was observed for 20 days and the percentage of the reactant remaining after each day was recorded in the table above. Which of the following best describes the order and the half-life of the reaction?{ =[moodle]Reaction order \= First ; half-life \= 3 days ~[moodle]Reaction order \= First ; half-life \= 10 days ~[moodle]Reaction order \= Second ; half-life \= 3 days ~[moodle]Reaction order \= Second ; half-life \= 6 days ~[moodle]Reaction order \= Second ; half-life \= 10 days } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4255 name: ::AP 2002-56:: The boiling points of the elements helium, neon, argon, krypton, and xenon increase in that order. Which of the following statements accounts for this increase? ::\:\:AP 2002-56\:\: The boiling points of the elements helium, neon, argon, krypton, and xenon increase in that order. Which of the following statements accounts for this increase?::[html]\:\:AP 2002-56\:\: The boiling points of the elements helium, neon, argon, krypton, and xenon increase in that order. Which of the following statements accounts for this increase?{ =[moodle]The London (dispersion) forces increase. ~[moodle]The hydrogen bonding increases. ~[moodle]The dipole-dipole forces increase. ~[moodle]The chemical reactivity increases. ~[moodle]The number of nearest neighbors increases. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4365 name: ::AP 2002-57:: Rate = k[M][N]2 The rate of a certain chemical reaction between substances M and N obeys the rate law above. The reaction is first studied with [M] and [N] each 1 × 10 ::\:\:AP 2002-57\:\: Rate \= k[M][N]2 The rate of a certain chemical reaction between substances M and N obeys the rate law above. The reaction is first studied with [M] and [N] each 1 × 10::[html]\:\:AP 2002-57\:\:
Rate \= k[M][N]2

The rate of a certain chemical reaction between substances M and N obeys the rate law above. The reaction is first studied with [M] and [N] each 1 × 10-3 molar. If a new experiment is conducted with [M] and [N] each 2 × 10-3 molar, the reaction rate will increase by a factor of{ ~[moodle]2 ~[moodle]4 ~[moodle]6 =[moodle]8 ~[moodle]16 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4048 name: ::AP 2002-58:: 2 N2H4(g) + N2O4(g) → 3 N2(g) + 4 H2O(g) When 8.0 g of N2H4 (32 g mo ::\:\:AP 2002-58\:\: 2 N2H4(g) + N2O4(g) → 3 N2(g) + 4 H2O(g) When 8.0 g of N2H4 (32 g mo::[html]\:\:AP 2002-58\:\:
2 N2H4(g) + N2O4(g) → 3 N2(g) + 4 H2O(g)

When 8.0 g of N2H4 (32 g mol-1) and 92 g of N2O4 (92 g mol-1) are mixed together and react according to the equation above, what is the maximum mass of H2O that can be produced?{ =[moodle]9.0 g ~[moodle]18 g ~[moodle]36 g ~[moodle]72 g ~[moodle]144 g } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4124 name: ::AP 2002-59:: All of the halogens in their elemental form at 25°C and 1 atm are ::\:\:AP 2002-59\:\: All of the halogens in their elemental form at 25°C and 1 atm are::[html]\:\:AP 2002-59\:\: All of the halogens in their elemental form at 25°C and 1 atm are{ ~[moodle]conductors of electricity =[moodle]diatomic molecules ~[moodle]odorless ~[moodle]colorless ~[moodle]gases } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4049 name: ::AP 2002-60:: 2 H2O(l) + 4 MnO4-(aq) + 3 ClO2-(aq) → 4 MnO2(s) + 3 ClO4-(aq) + 4 OH-(aq) ::\:\:AP 2002-60\:\: 2 H2O(l) + 4 MnO4-(aq) + 3 ClO2-(aq) → 4 MnO2(s) + 3 ClO4-(aq) + 4 OH-(aq)::[html]\:\:AP 2002-60\:\:
2 H2O(l) + 4 MnO4-(aq) + 3 ClO2-(aq) → 4 MnO2(s) + 3 ClO4-(aq) + 4 OH-(aq)

According to the balanced equation above, how many moles of ClO2-(aq) are needed to react completely with 20. mL of 0.20 M KMnO4 solution?{ =[moodle]0.0030 mol ~[moodle]0.0053 mol ~[moodle]0.0075 mol ~[moodle]0.013 mol ~[moodle]0.030 mol } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4417 name: ::AP 2002-61:: How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00? ::\:\:AP 2002-61\:\: How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00?::[html]\:\:AP 2002-61\:\: How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00?{ ~[moodle]By diluting the solution with distilled water to a total volume of 108 mL ~[moodle]By diluting the solution with distilled water to a total volume of 200 mL =[moodle]By diluting the solution with distilled water to a total volume of 1.00 L ~[moodle]By adding 100. mL of 0.10 M HCl ~[moodle]By adding 100. mL of 0.10 M NaOH } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Organic Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Organic Chemistry // question: 4523 name: ::AP 2002-62:: Which of the following structural formulas represents an isomer of the compound that has the structural formula represented above? ::\:\:AP 2002-62\:\: Which of the following structural formulas represents an isomer of the compound that has the structural formula represented above?::[html]Which of the following structural formulas represents an isomer of the compound that has the structural formula represented below?

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{ ~[moodle]# This is the same compound from a different angle. =[moodle]# Correct! This is a structural isomer (same formula, but atoms attached differently). ~[moodle]# This is the same compound. Remember that C-C single bonds can rotate. ~[moodle]# This is a different compound, not an isomer, because it has a different chemical formula (C3H6Br2 instead of C3H7Br). ~[moodle]# This is a different compound, not an isomer, because it has a different chemical formula (C4H9Br instead of C3H7Br). } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4418 name: ::AP 2002-63:: Mixtures that would be considered buffers include which of the following? I. 0.10 M HCl + 0.10 M NaCl II. 0.10 M HF + 0.10 M NaF III. 0.10 M HBr + ::\:\:AP 2002-63\:\: Mixtures that would be considered buffers include which of the following? I. 0.10 M HCl + 0.10 M NaCl II. 0.10 M HF + 0.10 M NaF III. 0.10 M HBr +::[html]\:\:AP 2002-63\:\: Mixtures that would be considered buffers include which of the following?

I. 0.10 M HCl + 0.10 M NaCl
II. 0.10 M HF + 0.10 M NaF
III. 0.10 M HBr + 0.10 M NaBr{ ~[moodle]I only =[moodle]II only ~[moodle]III only ~[moodle]I and II ~[moodle]II and III } // question: 4419 name: ::AP 2002-64:: Ascorbic acid, H2C6H6O6(s), is a diprotic acid with K1 = 7.9 × 10-5 and K2 = 1.6 × 10-12. In a 0.005  ::\:\:AP 2002-64\:\: Ascorbic acid, H2C6H6O6(s), is a diprotic acid with K1 \= 7.9 × 10-5 and K2 \= 1.6 × 10-12. In a 0.005 ::[html]\:\:AP 2002-64\:\: Ascorbic acid, H2C6H6O6(s), is a diprotic acid with K1 \= 7.9 × 10-5 and K2 \= 1.6 × 10-12. In a 0.005 M aqueous solution of ascorbic acid, which of the following species is present in the lowest concentration?{ ~[moodle]H2O(l) ~[moodle]H3O+(aq) ~[moodle]H2C6H6O6(aq) ~[moodle]HC6H6O6-(aq) =[moodle]C6H6O62-(aq) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3955 name: ::AP 2002-65:: Which of the following substances is LEAST soluble in water? ::\:\:AP 2002-65\:\: Which of the following substances is LEAST soluble in water?::[html]\:\:AP 2002-65\:\: Which of the following substances is LEAST soluble in water?{ ~[moodle](NH4)2SO4 ~[moodle]KMnO4 =[moodle]BaCO3 ~[moodle]Zn(NO3)2 ~[moodle]Na3PO4 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3892 name: ::AP 2002-66:: A 2 L container will hold about 4 g of which of the following gases at 0°C and 1 atm? ::\:\:AP 2002-66\:\: A 2 L container will hold about 4 g of which of the following gases at 0°C and 1 atm?::[html]\:\:AP 2002-66\:\: A 2 L container will hold about 4 g of which of the following gases at 0°C and 1 atm?{ ~[moodle]SO2 ~[moodle]N2 =[moodle]CO2 ~[moodle]C4H8 ~[moodle]NH3 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4256 name: ::AP 2002-67:: Which of the following describes the changes in forces of attraction that occur as H2O changes phase from a liquid to a vapor? ::\:\:AP 2002-67\:\: Which of the following describes the changes in forces of attraction that occur as H2O changes phase from a liquid to a vapor?::[html]\:\:AP 2002-67\:\: Which of the following describes the changes in forces of attraction that occur as H2O changes phase from a liquid to a vapor?{ ~[moodle]H-O bonds break as H-H and O-O bonds form. =[moodle]Hydrogen bonds between H2O molecules are broken. ~[moodle]Covalent bonds between H2O molecules are broken. ~[moodle]Ionic bonds between H+ ions and OH- ions are broken. ~[moodle]Covalent bonds between H+ ions and H2O molecules become more effective. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4206 name: ::AP 2002-68:: Liquid naphthalene at 95°C was cooled to 30°C as represented in the cooling curve above. From which section of the curve can the melting point of naphthalene be determined? ::\:\:AP 2002-68\:\: Liquid naphthalene at 95°C was cooled to 30°C as represented in the cooling curve above. From which section of the curve can the melting point of naphthalene be determined?::[html]\:\:AP 2002-68\:\: Liquid naphthalene at 95°C was cooled to 30°C as represented in the cooling curve below.

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Which of the following ions could be present in the solution at a concentration of 0.10 M?{ ~[moodle]Ni2+(aq) ~[moodle]Al3+(aq) ~[moodle]Ba2+(aq) =[moodle]Na+(aq) ~[moodle]CO32-(aq) } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4207 name: ::AP 2002-73:: X(s) ⇌ X(l) Which of the following is true for any substance undergoing the process represented above at its normal melting point? ::\:\:AP 2002-73\:\: X(s) &\#8652; X(l) Which of the following is true for any substance undergoing the process represented above at its normal melting point?::[html]\:\:AP 2002-73\:\:
X(s) &\#8652; X(l)

Which of the following is true for any substance undergoing the process represented above at its normal melting point?{ ~[moodle]ΔS < 0 ~[moodle]ΔH \= 0 ~[moodle]ΔH \= TΔG ~[moodle]TΔS \= 0 =[moodle]ΔH \= TΔS } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3959 name: ::AP 2002-74:: A pure, white crystalline solid dissolves in water to yield a basic solution that liberates a gas when excess acid is added to it. On the basis of this information, the solid could be ::\:\:AP 2002-74\:\: A pure, white crystalline solid dissolves in water to yield a basic solution that liberates a gas when excess acid is added to it. On the basis of this information, the solid could be::[html]\:\:AP 2002-74\:\: A pure, white crystalline solid dissolves in water to yield a basic solution that liberates a gas when excess acid is added to it. On the basis of this information, the solid could be{ ~[moodle]KNO3 =[moodle]K2CO3 ~[moodle]KOH ~[moodle]KHSO4 ~[moodle]KCl } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Precipitation Equilibria \$CATEGORY: \$course\$/AP Multiple Choice/Precipitation Equilibria // question: 4462 name: ::AP 2002-75:: In a saturated solution of Zn(OH)2 at 25°C the value of [OH-] is 2.0 × 10-6 M. What is the value of the solubility-product constant, Ksp, for Zn(OH)2 at ::\:\:AP 2002-75\:\: In a saturated solution of Zn(OH)2 at 25°C the value of [OH-] is 2.0 × 10-6 M. What is the value of the solubility-product constant, Ksp, for Zn(OH)2 at::[html]\:\:AP 2002-75\:\: In a saturated solution of Zn(OH)2 at 25°C the value of [OH-] is 2.0 × 10-6 M. What is the value of the solubility-product constant, Ksp, for Zn(OH)2 at 25°C?{ =[moodle]4.0 × 10-18 ~[moodle]8.0 × 10-18 ~[moodle]1.6 × 10-17 ~[moodle]4.0 × 10-12 ~[moodle]2.0 × 10-6 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3992 name: ::AP 2007P-01:: Which of the following is commonly used as a disinfectant for minor skin wounds? ::\:\:AP 2007P-01\:\: Which of the following is commonly used as a disinfectant for minor skin wounds?::[html]\:\:AP 2007P-01\:\: Which of the following is commonly used as a disinfectant for minor skin wounds?{ ~[moodle]CH4# ~[moodle]CCl3F# ~[moodle]H2S# =[moodle]H2O2# ~[moodle]K2CrO4# } // question: 3993 name: ::AP 2007P-02:: Which of the following is a refrigerant implicated in the thinning of the stratospheric ozone layer? ::\:\:AP 2007P-02\:\: Which of the following is a refrigerant implicated in the thinning of the stratospheric ozone layer?::[html]\:\:AP 2007P-02\:\: Which of the following is a refrigerant implicated in the thinning of the stratospheric ozone layer?{ ~[moodle]CH4# =[moodle]CCl3F# ~[moodle]H2S# ~[moodle]H2O2# ~[moodle]K2CrO4# } // question: 3994 name: ::AP 2007P-03:: Which of the following is a major component of the fuel known as natural gas? ::\:\:AP 2007P-03\:\: Which of the following is a major component of the fuel known as natural gas?::[html]\:\:AP 2007P-03\:\: Which of the following is a major component of the fuel known as natural gas?{ =[moodle]CH4# ~[moodle]CCl3F# ~[moodle]H2S# ~[moodle]H2O2# ~[moodle]K2CrO4# } // question: 3995 name: ::AP 2007P-04:: Which of the following is a yellow solid at room temperature and 1 atm? ::\:\:AP 2007P-04\:\: Which of the following is a yellow solid at room temperature and 1 atm?::[html]\:\:AP 2007P-04\:\: Which of the following is a yellow solid at room temperature and 1 atm?{ ~[moodle]CH4# ~[moodle]CCl3F# ~[moodle]H2S# ~[moodle]H2O2# =[moodle]K2CrO4# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4174 name: ::AP 2007P-05:: Which of the following contains two π-bonds? ::\:\:AP 2007P-05\:\: Which of the following contains two π-bonds?::[html]\:\:AP 2007P-05\:\: Which of the following contains two π-bonds?{ =[moodle]CO# ~[moodle]CH4# ~[moodle]HF# ~[moodle]PH3# ~[moodle]F2# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4281 name: ::AP 2007P-06:: Which of the following has the highest dipole moment? ::\:\:AP 2007P-06\:\: Which of the following has the highest dipole moment?::[html]\:\:AP 2007P-06\:\: Which of the following has the highest dipole moment?{ ~[moodle]CO#When the electron pair is donated to C by O via the coordinate bond, the partial negative charge on O decreases and that of C increases. This results in lowering the effective difference in electronegativity between C and O, which in turn suppresses the dipole moment. ~[moodle]CH4 =[moodle]HF ~[moodle]PH3 ~[moodle]F2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Bonding & Molecular Geometry \$CATEGORY: \$course\$/AP Multiple Choice/Bonding & Molecular Geometry // question: 4175 name: ::AP 2007P-07:: Which of the following has a molecular geometry that is trigonal pyramidal? ::\:\:AP 2007P-07\:\: Which of the following has a molecular geometry that is trigonal pyramidal?::[html]\:\:AP 2007P-07\:\: Which of the following has a molecular geometry that is trigonal pyramidal?{ ~[moodle]CO# ~[moodle]CH4# ~[moodle]HF# =[moodle]PH3# ~[moodle]F2# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4114 name: ::AP 2007P-08:: Which of the following atomic orbitals represents an atom in an excited state? ::\:\:AP 2007P-08\:\: Which of the following atomic orbitals represents an atom in an excited state?::[html]\:\:AP 2007P-08\:\: Which of the following atomic orbitals represents an atom in an excited state?{ ~[moodle] =[moodle] ~[moodle] ~[moodle] ~[moodle] } // question: 4115 name: ::AP 2007P-09:: Which of the following atomic orbitals represents an atom that has exactly five valence electrons? ::\:\:AP 2007P-09\:\: Which of the following atomic orbitals represents an atom that has exactly five valence electrons?::[html]\:\:AP 2007P-09\:\: Which of the following atomic orbitals represents an atom that has exactly five valence electrons?{ ~[moodle] ~[moodle] =[moodle] ~[moodle] ~[moodle] } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4131 name: ::AP 2007P-10:: Which of the following atomic orbitals represents the atom that has the highest first ionization energy? ::\:\:AP 2007P-10\:\: Which of the following atomic orbitals represents the atom that has the highest first ionization energy?::[html]\:\:AP 2007P-10\:\: Which of the following atomic orbitals represents the atom that has the highest first ionization energy?{ =[moodle]# ~[moodle]# ~[moodle]# ~[moodle]# ~[moodle]# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electronic Structure \$CATEGORY: \$course\$/AP Multiple Choice/Electronic Structure // question: 4116 name: ::AP 2007P-11:: Which of the following atomic orbitals represents an atom that forms an aqueous cation that is colored? ::\:\:AP 2007P-11\:\: Which of the following atomic orbitals represents an atom that forms an aqueous cation that is colored?::[html]\:\:AP 2007P-11\:\: Which of the following atomic orbitals represents an atom that forms an aqueous cation that is colored?{ ~[moodle] ~[moodle] ~[moodle] ~[moodle] =[moodle] } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 3996 name: ::AP 2007P-12:: Which of the following chemical equations represents an oxidation-reduction reaction? ::\:\:AP 2007P-12\:\: Which of the following chemical equations represents an oxidation-reduction reaction?::[html]\:\:AP 2007P-12\:\: Which of the following chemical equations represents an oxidation-reduction reaction?{ ~[moodle]HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq)# ~[moodle]Ba2+(aq) + SO42-(aq) → BaSO4(s)# ~[moodle]Zn(OH)2(s) + 2 OH-(aq) → [Zn(OH)4]2-(aq)# =[moodle]2 K(s) + Br2(l) → 2 KBr(s)# ~[moodle]N2O4(g) → 2 NO2(g)# } // question: 3997 name: ::AP 2007P-13:: Which of the following chemical equations represents a precipitation reaction? ::\:\:AP 2007P-13\:\: Which of the following chemical equations represents a precipitation reaction?::[html]\:\:AP 2007P-13\:\: Which of the following chemical equations represents a precipitation reaction?{ ~[moodle]HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq)# =[moodle]Ba2+(aq) + SO42-(aq) → BaSO4(s)# ~[moodle]Zn(OH)2(s) + 2 OH-(aq) → [Zn(OH)4]2-(aq)# ~[moodle]2 K(s) + Br2(l) → 2 KBr(s)# ~[moodle]N2O4(g) → 2 NO2(g)# } // question: 3998 name: ::AP 2007P-14:: Which of the following chemical equations represents a reaction in which a coordination complex is formed? ::\:\:AP 2007P-14\:\: Which of the following chemical equations represents a reaction in which a coordination complex is formed?::[html]\:\:AP 2007P-14\:\: Which of the following chemical equations represents a reaction in which a coordination complex is formed?{ ~[moodle]HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq)# ~[moodle]Ba2+(aq) + SO42-(aq) → BaSO4(s)# =[moodle]Zn(OH)2(s) + 2 OH-(aq) → [Zn(OH)4]2-(aq)# ~[moodle]2 K(s) + Br2(l) → 2 KBr(s)# ~[moodle]N2O4(g) → 2 NO2(g)# } // question: 3999 name: ::AP 2007P-15:: Which of the following chemical equations represents a Lewis acid-base reaction that is not a Brønsted-Lowry acid-base reaction? ::\:\:AP 2007P-15\:\: Which of the following chemical equations represents a Lewis acid-base reaction that is not a Brønsted-Lowry acid-base reaction?::[html]\:\:AP 2007P-15\:\: Which of the following chemical equations represents a Lewis acid-base reaction that is not a Brønsted-Lowry acid-base reaction?{ ~[moodle]HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq)# ~[moodle]Ba2+(aq) + SO42-(aq) → BaSO4(s)# =[moodle]Zn(OH)2(s) + 2 OH-(aq) → [Zn(OH)4]2-(aq)# ~[moodle]2 K(s) + Br2(l) → 2 KBr(s)# ~[moodle]N2O4(g) → 2 NO2(g)# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4222 name: ::AP 2007P-16:: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph ... ::\:\:AP 2007P-16\:\: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph ...::[html]\:\:AP 2007P-16\:\: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph shows the temperature of the sample as a function of time.

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At which time was the average distance between the particles the greatest?{ ~[moodle]t1 ~[moodle]t2 ~[moodle]t3 ~[moodle]t4 =[moodle]t5 } // question: 4223 name: ::AP 2007P-17:: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph ... ::\:\:AP 2007P-17\:\: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph ...::[html]\:\:AP 2007P-17\:\: The diagram below represents an experiment conducted at 1.0 atm in which heat was added at a constant rate to a sample of a pure substance that was solid at time t0. The graph shows the temperature of the sample as a function of time.

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At which time was the temperature of the substance between its melting point and its boiling point?{ ~[moodle]t1 ~[moodle]t2 =[moodle]t3 ~[moodle]t4 ~[moodle]t5 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4575 name: ::AP 2007P-18:: Which of the following is the correct name for the compound with formula Ca3P2? ::\:\:AP 2007P-18\:\: Which of the following is the correct name for the compound with formula Ca3P2?::[html]\:\:AP 2007P-18\:\: Which of the following is the correct name for the compound with formula Ca3P2?{ ~[moodle]tricalcium diphosphorus# ~[moodle]calcium phosphite# ~[moodle]calcium phosphate# ~[moodle]calcium diphosphate# =[moodle]calcium phosphide# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4337 name: ::AP 2007P-19:: What mass of KBr (molar mass 119 g mol-1) is required to make 250 mL of a 0.400 M KBr solution? ::\:\:AP 2007P-19\:\: What mass of KBr (molar mass 119 g mol-1) is required to make 250 mL of a 0.400 M KBr solution?::[html]\:\:AP 2007P-19\:\: What mass of KBr (molar mass 119 g mol-1) is required to make 250 mL of a 0.400 M KBr solution?{ ~[moodle]0.595 g# ~[moodle]1.19 g# ~[moodle]2.50 g# =[moodle]11.9 g# ~[moodle]47.6 g# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4434 name: ::AP 2007P-20:: The value of the acid-dissociation constant, Ka, for a weak monoprotic acid HA is 2.5 × 10-6. The pH of 0.40 M HA is closest to ::\:\:AP 2007P-20\:\: The value of the acid-dissociation constant, Ka, for a weak monoprotic acid HA is 2.5 × 10-6. The pH of 0.40 M HA is closest to::[html]\:\:AP 2007P-20\:\: The value of the acid-dissociation constant, Ka, for a weak monoprotic acid HA is 2.5 × 10-6. The pH of 0.40 M HA is closest to{ ~[moodle]2.0# =[moodle]3.0# ~[moodle]4.0# ~[moodle]6.0# ~[moodle]8.0# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4396 name: ::AP 2007P-21:: Which of the systems in equilibrium represented below will exhibit a shift to the left (toward reactants) when the pressure on the system is increased by reducing the volume of the ... ::\:\:AP 2007P-21\:\: Which of the systems in equilibrium represented below will exhibit a shift to the left (toward reactants) when the pressure on the system is increased by reducing the volume of the ...::[html]\:\:AP 2007P-21\:\: Which of the systems in equilibrium represented below will exhibit a shift to the left (toward reactants) when the pressure on the system is increased by reducing the volume of the system? (Assume that temperature is constant.){ ~[moodle]2 Mg(s) + O2(g) ↔ 2 MgO(s)# ~[moodle]SF4(g) + F2(g) ↔ SF6(g)# ~[moodle]H2(g) + Br2(g) ↔ 2 HBr(g)# ~[moodle]N2(g) + 3 H2(g) ↔ 2 NH3(g)# =[moodle]SO2Cl2(g) ↔ SO2(g) + Cl2(g)# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4224 name: ::AP 2007P-22:: The standard enthalpy of formation, ΔH°f, of HI(g) is +26 kJ mol-1. Which of the following is the approximate mass of HI(g) that must decompose into H2 ::\:\:AP 2007P-22\:\: The standard enthalpy of formation, ΔH°f, of HI(g) is +26 kJ mol-1. Which of the following is the approximate mass of HI(g) that must decompose into H2::[html]\:\:AP 2007P-22\:\: The standard enthalpy of formation, ΔH°f, of HI(g) is +26 kJ mol-1. Which of the following is the approximate mass of HI(g) that must decompose into H2(g) and I2(s) to release 500. kJ of energy?{ ~[moodle]250 g# ~[moodle]650 g# ~[moodle]1,300 g# =[moodle]2,500 g# ~[moodle]13,000 g# } // question: 4225 name: ::AP 2007P-23:: For the process of solid calcium chloride dissolving in water, represented below, the entropy change might be expected to be positive. However, ΔS for the process is actually ... ::\:\:AP 2007P-23\:\: For the process of solid calcium chloride dissolving in water, represented below, the entropy change might be expected to be positive. However, ΔS for the process is actually ...::[html]\:\:AP 2007P-23\:\: For the process of solid calcium chloride dissolving in water, represented below, the entropy change might be expected to be positive. However, ΔS for the process is actually negative. Which of the following best helps account for the net loss of entropy?

CaCl2(s) → Ca2+(aq) + 2 Cl-(aq)
{ ~[moodle]Cl- ions are much larger in size than Ca2+ ions.# ~[moodle]The particles in solid calcium chloride are more ordered than are particles in amorphous solids.# =[moodle]Water molecules in the hydration shells of Ca2+ and Cl- ions are more ordered than they are in pure water.# ~[moodle]The Ca2+(aq) and Cl-(aq) ions are more free to move around in solution than they are in CaCl2(s).# ~[moodle]In the solution, the average distance Ca2+(aq) Cl-(aq) is greater than the average distance between Ca2+(aq) and Cl-(aq) in CaCl2(s).# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4069 name: ::AP 2007P-24:: Whern the equation below is balanced using the lowest whole-number coefficients, the coefficient for O2(g) is CH3OCH3(g) + O2(g) ::\:\:AP 2007P-24\:\: Whern the equation below is balanced using the lowest whole-number coefficients, the coefficient for O2(g) is CH3OCH3(g) + O2(g)::[html]\:\:AP 2007P-24\:\: Whern the equation below is balanced using the lowest whole-number coefficients, the coefficient for O2(g) is

CH3OCH3(g) + O2(g) → CO2(g) + H2O(g)
{ ~[moodle]6# ~[moodle]4# =[moodle]3# ~[moodle]2# ~[moodle]1# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4226 name: ::AP 2007P-25:: For which of the following processes does entropy decrease (ΔS < 0)? ::\:\:AP 2007P-25\:\: For which of the following processes does entropy decrease (ΔS < 0)?::[html]\:\:AP 2007P-25\:\: For which of the following processes does entropy decrease (ΔS < 0)?{ ~[moodle]H2O(s) → H2O(l)# ~[moodle]Br2(l) → Br2(g)# =[moodle]Crystallization of I2(s) from an ethanol solution# ~[moodle]Thermal expansion of a balloon filled with CO2(g)# ~[moodle]Mixing of equal volumes of H2O(l) and CH3OH(l)# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3936 name: ::AP 2007P-26:: In a laboratory, a student wants to quantitatively collect the CO2 gas generated by adding Na2CO3(s) to 2.5 M HCl. The student sets up the apparatus to collect the CO ::\:\:AP 2007P-26\:\: In a laboratory, a student wants to quantitatively collect the CO2 gas generated by adding Na2CO3(s) to 2.5 M HCl. The student sets up the apparatus to collect the CO::[html]\:\:AP 2007P-26\:\: In a laboratory, a student wants to quantitatively collect the CO2 gas generated by adding Na2CO3(s) to 2.5 M HCl. The student sets up the apparatus to collect the CO2 gas over water. The volume of collected gas is much less than the expected volume because CO2 gas{ =[moodle]is very soluble in water# ~[moodle]is produced at a low pressure# ~[moodle]is more dense than water vapor# ~[moodle]has a larger molar mass than that of N2 gas, the major component of air# ~[moodle]has a slower average molecular speed than water vapor at the same temperature# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4070 name: ::AP 2007P-27:: What mass of Cus would be produced if 0.40 mol of Cu2O was reduced completely with excess H2(g)? ::\:\:AP 2007P-27\:\: What mass of Cus would be produced if 0.40 mol of Cu2O was reduced completely with excess H2(g)?::[html]\:\:AP 2007P-27\:\: What mass of Cu(s) would be produced if 0.40 mol of Cu2O was reduced completely with excess H2(g)?{ ~[moodle]13 g ~[moodle]25 g ~[moodle]38 g =[moodle]51 g ~[moodle]100 g } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Organic Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Organic Chemistry // question: 4525 name: ::AP 2007P-28:: Which of the following is a formula for an ether? ::\:\:AP 2007P-28\:\: Which of the following is a formula for an ether?::[html]\:\:AP 2007P-28\:\: Which of the following is a formula for an ether?{ ~[moodle] ~[moodle] ~[moodle] ~[moodle] =[moodle] } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3937 name: ::AP 2007P-29:: Three gases in the amounts shown in the table below are added to a previously evacuated rigid tank. Gas Amount Ar 0.35 mol ::\:\:AP 2007P-29\:\: Three gases in the amounts shown in the table below are added to a previously evacuated rigid tank. Gas Amount Ar 0.35 mol::[html]\:\:AP 2007P-29\:\: Three gases in the amounts shown in the table below are added to a previously evacuated rigid tank.

\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
Gas\n Amount\n
Ar\n 0.35 mol\n
CH4\n 0.90 mol\n
N2\n 0.25 mol\n

If the total pressure in the tank is 3.0 atm at 25°C, the partial pressure of N2(g) in the tank is closest to{ ~[moodle]0.75 atm =[moodle]0.50 atm ~[moodle]0.33 atm ~[moodle]0.25 atm ~[moodle]0.17 atm } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4282 name: ::AP 2007P-30:: Which of the following best explains why the normal boiling point of CCl4(l) (350 K) is higher than the normal boiling point of CF4(l) (145 K)? ::\:\:AP 2007P-30\:\: Which of the following best explains why the normal boiling point of CCl4(l) (350 K) is higher than the normal boiling point of CF4(l) (145 K)?::[html]\:\:AP 2007P-30\:\: Which of the following best explains why the normal boiling point of CCl4(l) (350 K) is higher than the normal boiling point of CF4(l) (145 K)?{ ~[moodle]The C-Cl bonds in CCl4 are less polar than the C-F bonds in CF4. ~[moodle]The C-Cl bonds in CCl4 are weaker than the C-F bonds in CF4. ~[moodle]The mass of the CCl4 molecule is greater than that of the CF4 molecule. =[moodle]The electron cloud of the CCl4 molecule is more polarizable than that of the CF4 molecule. ~[moodle]The bonds in the CCl4 molecule are covalent, whereas the bonds in the CF4 molecule are ionic. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3938 name: ::AP 2007P-31:: At which of the following temperatures and pressures would a real gas be most likely to deviate from ideal behavior? ::\:\:AP 2007P-31\:\: At which of the following temperatures and pressures would a real gas be most likely to deviate from ideal behavior?::[html]\:\:AP 2007P-31\:\: At which of the following temperatures and pressures would a real gas be most likely to deviate from ideal behavior?{ =[moodle]T \= 100 K; P \= 50 atm# ~[moodle]T \= 200 K; P \= 5 atm# ~[moodle]T \= 300 K; P \= 0.01 atm# ~[moodle]T \= 500 K; P \= 0.01 atm# ~[moodle]T \= 500 K; P \= 1 atm# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4514 name: ::AP 2007P-32:: After 195 days, a 10.0 g sample of pure 95Zr has decayed to the extent that only 1.25 g of the original 95Zr remains. The half-life of 95Zr is closest to ::\:\:AP 2007P-32\:\: After 195 days, a 10.0 g sample of pure 95Zr has decayed to the extent that only 1.25 g of the original 95Zr remains. The half-life of 95Zr is closest to::[html]\:\:AP 2007P-32\:\: After 195 days, a 10.0 g sample of pure 95Zr has decayed to the extent that only 1.25 g of the original 95Zr remains. The half-life of 95Zr is closest to{ ~[moodle]195 days# ~[moodle]97.5 days# =[moodle]65.0 days# ~[moodle]48.8 days# ~[moodle]24.4 days# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4071 name: ::AP 2007P-33:: Which of the following would produce the LEAST mass of CO2 if completely burned in excess oxygen gas? ::\:\:AP 2007P-33\:\: Which of the following would produce the LEAST mass of CO2 if completely burned in excess oxygen gas?::[html]\:\:AP 2007P-33\:\: Which of the following would produce the LEAST mass of CO2 if completely burned in excess oxygen gas?{ ~[moodle]10.0 g CH4# =[moodle]10.0 g CH3OH# ~[moodle]10.0 g C2H4# ~[moodle]10.0 g C2H6# ~[moodle]10.0 g C4H5OH# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces \$CATEGORY: \$course\$/AP Multiple Choice/Solids, Liquids & Intermolecular Forces // question: 4283 name: ::AP 2007P-34:: Which of the following exhibits significant hydrogen bonding in the liquid state? ::\:\:AP 2007P-34\:\: Which of the following exhibits significant hydrogen bonding in the liquid state?::[html]\:\:AP 2007P-34\:\: Which of the following exhibits significant hydrogen bonding in the liquid state?{ ~[moodle]CH2F2 =[moodle]N2H4 ~[moodle]CH3OCH3 ~[moodle]C2H4 ~[moodle]C2H2 } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4435 name: ::AP 2007P-35:: In an aqueous solution with a pH of 11.50 at 25°C, the molar concentration of OH-(aq) is approximately ::\:\:AP 2007P-35\:\: In an aqueous solution with a pH of 11.50 at 25°C, the molar concentration of OH-(aq) is approximately::[html]\:\:AP 2007P-35\:\: In an aqueous solution with a pH of 11.50 at 25°C, the molar concentration of OH-(aq) is approximately{ ~[moodle]3.2 × 10-12 M# =[moodle]3.2 × 10-3 M# ~[moodle]2.5 × 10-1 M# ~[moodle]2.5 M# ~[moodle]3.2 × 1011 M# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4397 name: ::AP 2007P-36:: Which of the following changes to a reaction system in equliibrium would affect the value of the equlibrium constant, Keq, for the reaction? (Assume in each case that all other ... ::\:\:AP 2007P-36\:\: Which of the following changes to a reaction system in equliibrium would affect the value of the equlibrium constant, Keq, for the reaction? (Assume in each case that all other ...::[html]\:\:AP 2007P-36\:\: Which of the following changes to a reaction system in equliibrium would affect the value of the equlibrium constant, Keq, for the reaction? (Assume in each case that all other conditions are held constant.){ ~[moodle]Adding more of the reactants to the system# ~[moodle]Adding a catalyst for the reaction to the system# =[moodle]Increasing the temperature of the system# ~[moodle]Increasing the pressure on the system# ~[moodle]Removing some of the reaction products from the system# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Electrochemistry \$CATEGORY: \$course\$/AP Multiple Choice/Electrochemistry // question: 4484 name: ::AP 2007P-37:: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below. Zn2+(aq) + 2 e- → Zn(s)  &nb ::\:\:AP 2007P-37\:\: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below. Zn2+(aq) + 2 e- → Zn(s)  &nb::[html]\:\:AP 2007P-37\:\: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below.

Zn2+(aq) + 2 e- → Zn(s)     E° \= -0.76 V

Fe3+(aq) + e- → Fe3+(aq)     E° \= 0.77 V

As the cell operates, ionic species that are found in the half-cell containing the cathode include which of the following?
1. Zn2+(aq)
2. Fe2+(aq)
3. Fe3+(aq)
{ ~[moodle]I only# ~[moodle]II only# ~[moodle]III only# ~[moodle]I and III# =[moodle]II and III# } // question: 4485 name: ::AP 2007P-38:: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below. Zn2+(aq) + 2 e- → Zn(s)  &nb ::\:\:AP 2007P-38\:\: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below. Zn2+(aq) + 2 e- → Zn(s)  &nb::[html]\:\:AP 2007P-38\:\: A galvanic cell is constructed using two half-cells based on the two half-reactions represented below.

Zn2+(aq) + 2 e- → Zn(s)     E° \= -0.76 V

Fe3+(aq) + e- → Fe3+(aq)     E° \= 0.77 V

What is the standard cell potential for the galvanic cell?{ ~[moodle]-0.01 V# ~[moodle]0.01 V# ~[moodle]0.78 V# =[moodle]1.53 V# ~[moodle]2.31 V# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Periodic Trends \$CATEGORY: \$course\$/AP Multiple Choice/Periodic Trends // question: 4132 name: ::AP 2007P-39:: The first seven ionization energies of element X are shown in the table below. 1st 2nd 3rd 4th 5th 6th 7th ::\:\:AP 2007P-39\:\: The first seven ionization energies of element X are shown in the table below. 1st 2nd 3rd 4th 5th 6th 7th::[html]\:\:AP 2007P-39\:\: The first seven ionization energies of element X are shown in the table below.

\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n
1st\n 2nd\n 3rd\n 4th\n 5th\n 6th\n 7th\n
Ionization Energy
(kJ mol-1)\n
787\n 1,580\n 3,200\n 4,400\n 16,000\n 20,000\n 24,000\n

On the basis of these data, element X is most lilkely a member of which of the following groups (families) of elements?{ ~[moodle]Alkaline earth metals ~[moodle]Boron group =[moodle]Carbon group ~[moodle]Nitrogen group ~[moodle]Halogen group } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Nuclear Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Nuclear Chemistry // question: 4515 name: ::AP 2007P-40:: Which of the following particles is emitted by an atom of 39Ca when it decays to produce an atom of 39K ::\:\:AP 2007P-40\:\: Which of the following particles is emitted by an atom of 39Ca when it decays to produce an atom of 39K::[html]\:\:AP 2007P-40\:\: Which of the following particles is emitted by an atom of 39Ca when it decays to produce an atom of 39K{ ~[moodle]42He# ~[moodle]10n# ~[moodle]11H# ~[moodle]β-# =[moodle]β+# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3939 name: ::AP 2007P-41:: At approximately what temperature will 40. g of argon gas at 2.0 atm occupy a volume of 22.4 L ::\:\:AP 2007P-41\:\: At approximately what temperature will 40. g of argon gas at 2.0 atm occupy a volume of 22.4 L::[html]\:\:AP 2007P-41\:\: At approximately what temperature will 40. g of argon gas at 2.0 atm occupy a volume of 22.4 L{ ~[moodle]1,200 K# ~[moodle]600 K# =[moodle]550 K# ~[moodle]270 K# ~[moodle]140 K# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4338 name: ::AP 2007P-42:: Which of the following aqueous solutions has the highest boiling point at 1.0 atm? ::\:\:AP 2007P-42\:\: Which of the following aqueous solutions has the highest boiling point at 1.0 atm?::[html]\:\:AP 2007P-42\:\: Which of the following aqueous solutions has the highest boiling point at 1.0 atm?{ ~[moodle]0.20 M CaCl2# =[moodle]0.25 M Na2SO4# ~[moodle]0.30 M NaCl# ~[moodle]0.30 M KBr# ~[moodle]0.40 M C6H12O6# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4227 name: ::AP 2007P-43:: A centain reaction is spontaneous at temperatures below 400. K but is not spontaneous at temperatures above 400. K. If ΔH° for the reaction is -20. kJ mol-1 and it is assumed that ... ::\:\:AP 2007P-43\:\: A centain reaction is spontaneous at temperatures below 400. K but is not spontaneous at temperatures above 400. K. If ΔH° for the reaction is -20. kJ mol-1 and it is assumed that ...::[html]\:\:AP 2007P-43\:\: A centain reaction is spontaneous at temperatures below 400. K but is not spontaneous at temperatures above 400. K. If ΔH° for the reaction is -20. kJ mol-1 and it is assumed that ΔH° and ΔS° do not change appreciably with temperature, then the value of ΔS° for the reaction is{ =[moodle]-50. J mol-1 K-1# ~[moodle]-20. J mol-1 K-1# ~[moodle]-0.050 J mol-1 K-1# ~[moodle]20. J mol-1 K-1# ~[moodle]8,000 J mol-1 K-1# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Solutions \$CATEGORY: \$course\$/AP Multiple Choice/Solutions // question: 4339 name: ::AP 2007P-44:: A sample of a solution of RbCl (molar mass 121 g mol-1) contains 11.0 percent RbCl by mass. From the following observation, what is needed to determine the molarity of RbCl in the ... ::\:\:AP 2007P-44\:\: A sample of a solution of RbCl (molar mass 121 g mol-1) contains 11.0 percent RbCl by mass. From the following observation, what is needed to determine the molarity of RbCl in the ...::[html]\:\:AP 2007P-44\:\: A sample of a solution of RbCl (molar mass 121 g mol-1) contains 11.0 percent RbCl by mass. From the following observation, what is needed to determine the molarity of RbCl in the solution?
1. Mass of the sample
2. Volume of the sample
3. Temperature of the sample
{ ~[moodle]I only# ~[moodle]II only# =[moodle]I and II only# ~[moodle]II and III only# ~[moodle]I, II, and III# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4072 name: ::AP 2007P-45:: When the reaction below is balanced using the lowest whole-number coefficients, the coefficient for I2(s) is Au3+(aq) + I-(aq) → A ::\:\:AP 2007P-45\:\: When the reaction below is balanced using the lowest whole-number coefficients, the coefficient for I2(s) is Au3+(aq) + I-(aq) → A::[html]\:\:AP 2007P-45\:\: When the reaction below is balanced using the lowest whole-number coefficients, the coefficient for I2(s) is

Au3+(aq) + I-(aq) → Au(s) + I2(s)
{ ~[moodle]8# ~[moodle]6# ~[moodle]4# =[moodle]3# ~[moodle]2# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4398 name: ::AP 2007P-46:: A closed rigid container contians distilled water and N2(g) at equilibrium. Actions that would increase the concentration of N2(g) in the water include which of the following? ::\:\:AP 2007P-46\:\: A closed rigid container contians distilled water and N2(g) at equilibrium. Actions that would increase the concentration of N2(g) in the water include which of the following? ::[html]\:\:AP 2007P-46\:\: A closed rigid container contians distilled water and N2(g) at equilibrium. Actions that would increase the concentration of N2(g) in the water include which of the following?
1. Shaking the container vigorously
2. Raising the temperature of the water
3. Injecting more N2(g) into the container
{ ~[moodle]I only# ~[moodle]II only# =[moodle]III only# ~[moodle]I and II only# ~[moodle]I, II, and III# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Kinetics \$CATEGORY: \$course\$/AP Multiple Choice/Kinetics // question: 4372 name: ::AP 2007P-47:: A pure substance Z decomposes into two products, X and Y, as shown by the equation below. Z → X + Y Which of the following graphs of ::\:\:AP 2007P-47\:\: A pure substance Z decomposes into two products, X and Y, as shown by the equation below. Z → X + Y Which of the following graphs of::[html]\:\:AP 2007P-47\:\: A pure substance Z decomposes into two products, X and Y, as shown by the equation below.

ZX + Y

Which of the following graphs of the concentration of Z versus time is consistent with the rate of the reaction being first order with respect to Z?{ ~[moodle] ~[moodle] ~[moodle] ~[moodle] =[moodle] } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Stoichiometry \$CATEGORY: \$course\$/AP Multiple Choice/Stoichiometry // question: 4073 name: ::AP 2007P-48:: When 0.60 mol of CS2(l) reacts as completely as possible with 1.5 mol of O2(g) according to the equation below, CS2(l) + 3&nb ::\:\:AP 2007P-48\:\: When 0.60 mol of CS2(l) reacts as completely as possible with 1.5 mol of O2(g) according to the equation below, CS2(l) + 3&nb::[html]\:\:AP 2007P-48\:\: When 0.60 mol of CS2(l) reacts as completely as possible with 1.5 mol of O2(g) according to the equation below,

CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g)

the total number of moles of reaction products is{ ~[moodle]2.4 mol# ~[moodle]2.1 mol# ~[moodle]1.8 mol# =[moodle]1.5 mol# ~[moodle]0.75 mol# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4546 name: ::AP 2007P-49:: A student performed tthe following experiment to determine the heat of fusion of ice: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup ... ::\:\:AP 2007P-49\:\: A student performed tthe following experiment to determine the heat of fusion of ice\: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup ...::[html]\:\:AP 2007P-49\:\: A student performed tthe following experiment to determine the heat of fusion of ice\: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup was weighed, then filled halfway with warm water, then weighed again. The temperature of the water was measured, and some ice cubes from a 0°C ice bath were added to the cup. The mixture was gently stirred as the ice melted, and the lowest temperature reached by the water in the cup was recorded. The cup and its contents were weighed again.

The purpose of weighing the cup and its contents at the end of the experiment was to{ =[moodle]determine the mass of ice that was added# ~[moodle]determine the mass of the thermometer# ~[moodle]determine the mass of water that evaporated# ~[moodle]verify the mass of water that was cooled# ~[moodle]verify the mass of the calorimeter cup# } // question: 4547 name: ::AP 2007P-50:: A student performed tthe following experiment to determine the heat of fusion of ice: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup ... ::\:\:AP 2007P-50\:\: A student performed tthe following experiment to determine the heat of fusion of ice\: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup ...::[html]\:\:AP 2007P-50\:\: A student performed tthe following experiment to determine the heat of fusion of ice\: The student used a calorimeter consisting of a polystyrene cup and a thermometer. The cup was weighed, then filled halfway with warm water, then weighed again. The temperature of the water was measured, and some ice cubes from a 0°C ice bath were added to the cup. The mixture was gently stirred as the ice melted, and the lowest temperature reached by the water in the cup was recorded. The cup and its contents were weighed again.

F-(aq) + H2O(l) → HF(aq) + OH-(aq)
{ ~[moodle]HF(aq) ~[moodle]H2O(l) ~[moodle]F-(aq) only =[moodle]Both F-(aq) and OH-(aq) act as Brønsted-Lowry bases. ~[moodle]No species acts as a Brønsted-Lowry base. } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4576 name: ::AP 2007P-56:: What is the empirical formula of a hydrocarbon that is 10.0 percent hydrogen by mass? ::\:\:AP 2007P-56\:\: What is the empirical formula of a hydrocarbon that is 10.0 percent hydrogen by mass?::[html]\:\:AP 2007P-56\:\: What is the empirical formula of a hydrocarbon that is 10.0 percent hydrogen by mass?{ ~[moodle]CH3# ~[moodle]C2H5# =[moodle]C3H4# ~[moodle]C4H9# ~[moodle]C9H10# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4228 name: ::AP 2007P-57:: Which of the following is true for the process represented below at 327°C and 1 atm? (The normal melting point of Pb(s) is 327°C.) Pb(s) ↔ Pb(l) ::\:\:AP 2007P-57\:\: Which of the following is true for the process represented below at 327°C and 1 atm? (The normal melting point of Pb(s) is 327°C.) Pb(s) ↔ Pb(l)::[html]\:\:AP 2007P-57\:\: Which of the following is true for the process represented below at 327°C and 1 atm? (The normal melting point of Pb(s) is 327°C.)

Pb(s) → Pb(l)
{ ~[moodle]ΔH \= 0 ~[moodle]TΔS \= 0 ~[moodle]ΔS < 0 ~[moodle]ΔH \= TΔG =[moodle]ΔH \= TΔS } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Equilibrium \$CATEGORY: \$course\$/AP Multiple Choice/Equilibrium // question: 4399 name: ::AP 2007P-58:: The equilibrium system represented below is contained in a sealed, rigid vessel. N2(g) + O2(g) ↔ 2 NOCl(g)      ::\:\:AP 2007P-58\:\: The equilibrium system represented below is contained in a sealed, rigid vessel. N2(g) + O2(g) ↔ 2 NOCl(g)     ::[html]\:\:AP 2007P-58\:\: The equilibrium system represented below is contained in a sealed, rigid vessel.

N2(g) + O2(g) + Cl2(g) → 2 NOCl(g) ΔH° \= +104 kJ mol-1

Which of the following will increase if the temperature of the mixture is raised?{ ~[moodle][N2(g)] ~[moodle]The rate of the forward reaction only ~[moodle]The rate of the reverse reaction only =[moodle]The rates of both the forward and reverse reactions ~[moodle]The total number of moles of gas in the vessel } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Atoms, Molecules & Ions \$CATEGORY: \$course\$/AP Multiple Choice/Atoms, Molecules & Ions // question: 4577 name: ::AP 2007P-59:: If a metal X forms an ionic chloride with the formula XCl3, then which of the following formulas is most likely to be that of a stable sulfide of X? ::\:\:AP 2007P-59\:\: If a metal X forms an ionic chloride with the formula XCl3, then which of the following formulas is most likely to be that of a stable sulfide of X?::[html]\:\:AP 2007P-59\:\: If a metal X forms an ionic chloride with the formula XCl3, then which of the following formulas is most likely to be that of a stable sulfide of X?{ ~[moodle]XS2# =[moodle]X2S3# ~[moodle]XS6# ~[moodle]X(SO3)3# ~[moodle]X2(SO3)2# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Acids & Bases \$CATEGORY: \$course\$/AP Multiple Choice/Acids & Bases // question: 4436 name: ::AP 2007P-60:: An acid solution of known concentration was titrated with a saturated solution of Ba(OH)2. Phenolphthalein was used as the indicator for the titration. What is the evidence that ... ::\:\:AP 2007P-60\:\: An acid solution of known concentration was titrated with a saturated solution of Ba(OH)2. Phenolphthalein was used as the indicator for the titration. What is the evidence that ...::[html]\:\:AP 2007P-60\:\: An acid solution of known concentration was titrated with a saturated solution of Ba(OH)2. Phenolphthalein was used as the indicator for the titration. What is the evidence that the endpoint of the titration has been reached?{ ~[moodle]The color of the solution in the buret changes from pink to colorless.# ~[moodle]The color of the solution in the buret changes from blue to red.# =[moodle]The color of the contents of the flask below the buret changes from colorless to pink.# ~[moodle]The color of the contents of the flask below the buret changes from blue to red.# ~[moodle]The contents of the flask below the buret change from clear to cloudy.# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Laboratory \$CATEGORY: \$course\$/AP Multiple Choice/Laboratory // question: 4548 name: ::AP 2007P-61:: The figures below show portions of a buret used in a titration of an acid solution of known concentration with a saturated solution of Ba(OH)2. Figures 1 and 2 show the level of ... ::\:\:AP 2007P-61\:\: The figures below show portions of a buret used in a titration of an acid solution of known concentration with a saturated solution of Ba(OH)2. Figures 1 and 2 show the level of ...::[html]\:\:AP 2007P-61\:\: The figures below show portions of a buret used in a titration of an acid solution of known concentration with a saturated solution of Ba(OH)2. Figures 1 and 2 show the level of the Ba(OH)2 solution at the start and at the endpoint of the titration, respectively.

\n

The volume of saturated Ba(OH)2 used to neutralize the acid was closest to{ ~[moodle]6.60 mL ~[moodle]22.80 mL ~[moodle]23.02 mL =[moodle]23.20 mL ~[moodle]29.80 mL } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics \$CATEGORY: \$course\$/AP Multiple Choice/Thermochemistry & Thermodynamics // question: 4229 name: ::AP 2007P-62:: For the reaction represented below, the standard Gibbs free energy change, ΔG°298, has a value of -2.90 kJ mol-1. C(diamond) → C(graphi ::\:\:AP 2007P-62\:\: For the reaction represented below, the standard Gibbs free energy change, ΔG°298, has a value of -2.90 kJ mol-1. C(diamond) → C(graphi::[html]\:\:AP 2007P-62\:\: For the reaction represented below, the standard Gibbs free energy change, ΔG°298, has a value of -2.90 kJ mol-1.

C(diamond) → C(graphite)

Which of the following best accounts for the observation that the reaction does not occur (i.e., diamond is stable) at 298 K and 1.00 atm?{ ~[moodle]ΔS° for the reaction is positive# =[moodle]The activation energy, Ea, for the reaction is very large.# ~[moodle]The reaction is slightly exothermic (ΔH° < 0)# ~[moodle]Diamond has a density greater than that of graphite.# ~[moodle]Diamond has a heat capacity lower than that of graphite.# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Gases \$CATEGORY: \$course\$/AP Multiple Choice/Gases // question: 3940 name: ::AP 2007P-63:: When 26.6 g of S8(s) (molar mass 256 g mol-1) reacts completely with an excess of H2(g) according to the equation below, 8 H2 ::\:\:AP 2007P-63\:\: When 26.6 g of S8(s) (molar mass 256 g mol-1) reacts completely with an excess of H2(g) according to the equation below, 8 H2::[html]\:\:AP 2007P-63\:\: When 26.6 g of S8(s) (molar mass 256 g mol-1) reacts completely with an excess of H2(g) according to the equation below,

8 H2(g) + S8(s) → 8 H2S(g)

the volume of H2S(g), measured at 0°C and 1.00 atm, produced is closest to{ ~[moodle]30 L# =[moodle]20 L# ~[moodle]10 L# ~[moodle]5 L# ~[moodle]2 L# } // question: 0 name: Switch category to \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry \$CATEGORY: \$course\$/AP Multiple Choice/Reactions & Descriptive Chemistry // question: 4001 name: ::AP 2007P-64:: As the reaction below proceeds to the right, 2 HClO + 3 O2 → 2 HClO4 the oxidation number of chlorine changes from ::\:\:AP 2007P-64\:\: As the reaction below proceeds to the right, 2 HClO + 3 O2 → 2 HClO4 the oxidation number of chlorine changes from::[html]\:\:AP 2007P-64\:\: As the reaction below proceeds to the right,

2 HClO + 3 O2 → 2 HClO4