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Which of the following statements is true?


A) The product is favored in reaction in which H° is a positive value.
B) Entropy decreases when an acyclic compound forms a ring.
C) In homolytic bond cleavage, entropy decreases and favors formation of products.
D) The starting material is favored in a reaction in which H° is a negative value.

E) B) and C)
F) A) and C)

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Which of the following statements about the equilibrium constant, Keq, is true?


A) When Keq > 1, the equilibrium favors the reactants.
B) When Keq < 1, the equilibrium favors the products.
C) The size of Keq tells about the position of equilibrium.
D) For a reaction to be useful, the equilibrium must favor the reactants.

E) B) and C)
F) A) and B)

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In which reaction is Keq > 1? In which reaction is K<sub>eq</sub> > 1? A) A B) B C) C


A) A
B) B
C) C

D) None of the above
E) A) and B)

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Using the bond dissociation energies given, calculate ?H° for the following reaction. (CH3) 3CCl+H2O⟶(CH3) 3COH+HCl+\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCl } + \mathrm { H } _ { 2 } \mathrm { O } \longrightarrow \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { COH } + \mathrm { HCl } ^ { + } Bond A-B ?H° KJ/mol (CH3) 3C-Cl 331 H-OH 498 (CH3) 3C-OH 401 H-Cl 431


A) +3 KJ/mol
B) -3 KJ/mol
C) -67 KJ/mol
D) +70 KJ/mol

E) B) and C)
F) A) and D)

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Which of the Keq corresponds to the most negative value of G°?


A) Keq = 1
B) Keq = 101
C) Keq = 102
D) Keq = 103

E) A) and D)
F) B) and D)

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Which of the following statements is true?


A) The size of the activation energy tells us about the reaction mechanism.
B) The size of the activation energy tells us about the reaction rate.
C) A slow reaction has low activation energy.
D) A fast reaction has large activation energy.

E) A) and B)
F) C) and D)

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Which of the following statements about equilibrium is true?


A) Equilibrium favors the products when the energy of the products is higher than the energy of the reactants.
B) Equilibrium favors the reactants when the energy of the product is lower than the energy of the reactants.
C) Equilibrium favors the products when they are less stable than the starting material of a reaction
D) Equilibrium favors the products when they are more stable than the starting material of a reaction.

E) C) and D)
F) A) and D)

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Which step would most likely have the largest energy of activation? Which step would most likely have the largest energy of activation? A) Step one B) Step two C) Step three D) It cannot be determined from the information provided


A) Step one
B) Step two
C) Step three
D) It cannot be determined from the information provided

E) A) and B)
F) C) and D)

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Which reaction is slowest? Which reaction is slowest? A) A B) B C) C


A) A
B) B
C) C

D) All of the above
E) A) and B)

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Which of the following statements is not true?


A) "Two reactions can have identical values for H° but very different Ea values."
B) "The larger the activation energy, the slower the reaction."
C) "H° determines the height of the energy barrier."
D) "The lower the activation energy, the faster the reaction."

E) All of the above
F) A) and B)

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Which of the following statements is true?


A) Bond dissociation energies increase down a column of the periodic table.
B) When H° is positive, more energy is released in forming bonds than is needed to break bonds.
C) When H° is negative, more energy is needed to break bonds than is released in forming bonds.
D) Bond dissociation energies decrease down a column of the periodic table.

E) None of the above
F) A) and D)

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Which compound would you predict to be highest in energy? Which compound would you predict to be highest in energy? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

E) B) and C)
F) A) and B)

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What kind of reaction does the conversion of A to D represent? What kind of reaction does the conversion of A to D represent? A) Addition reaction B) Substitution reaction C) Elimination reaction D) Oxidation-reduction reaction


A) Addition reaction
B) Substitution reaction
C) Elimination reaction
D) Oxidation-reduction reaction

E) A) and D)
F) B) and C)

Correct Answer

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Which of the following statements about substitution reactions is true?


A) Substitution reactions involve bonds.
B) Substitution reactions involve bonds.
C) One bond breaks and another forms at a different carbon atom.
D) One bond breaks and another forms at the same carbon atom.

E) C) and D)
F) B) and D)

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Which of the following statements about addition reactions is true?


A) Two bonds are formed.
B) Two bonds are broken.
C) Two bonds are formed.
D) One bond is formed.

E) A) and B)
F) All of the above

Correct Answer

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Which of the following statements about enzymes is true?


A) Enzymes increase the activation energy for a reaction.
B) Enzymes decrease the equilibrium constant.
C) Enzymes shift the equilibrium to favor the product.
D) Enzymes lower the transition state for the rate-determining step.

E) A) and B)
F) A) and C)

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The equilibrium constant for the conversion of A to D is predicted to be which of the following? The equilibrium constant for the conversion of A to D is predicted to be which of the following? A) K<sub>eq</sub> = 1 B) K<sub>eq</sub> < 1 C) K<sub>eq</sub> > 1 D) Cannot be determined from the information provided


A) Keq = 1
B) Keq < 1
C) Keq > 1
D) Cannot be determined from the information provided

E) C) and D)
F) B) and C)

Correct Answer

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Which of the following statements about a catalyst is true?


A) A catalyst accelerates a reaction by changing the amount of reactant and product at equilibrium.
B) A catalyst accelerates a reaction by lowering the energy of activation.
C) A catalyst accelerates a reaction by raising the energy of activation.
D) A catalyst accelerates a reaction by lowering the equilibrium constant.

E) All of the above
F) A) and B)

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Which of the following statements about a two-step reaction mechanism is true?


A) The transition states are located at energy minima.
B) Each step is characterized by its own value of H° and Ea.
C) The rate-determining step has the lower energy transition state.
D) The reactive intermediate is located at an energy maximum.

E) None of the above
F) All of the above

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Which reaction has a positive G°, assuming that entropy changes are negligible compared to enthalpy changes? Which reaction has a positive <font face= symbol ></font>G°, assuming that entropy changes are negligible compared to enthalpy changes? A) A B) B C) C


A) A
B) B
C) C

D) A) and B)
E) A) and C)

Correct Answer

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