Question 1

Which of the following has the highest bond dissociation energy?

Accepted Answer

A)   HF
B)   HCl
C)   HBr
D)   HIE) A) and B)
F) C) and D)

Question 2

Which of the following terms describes the role of ethanol in the acid-base reaction shown?

Accepted Answer

A)   Brønsted-Lowry acid
B)   Brønsted-Lowry base
C)   Lewis acid
D)   Lewis baseE) A) and B)
F) C) and D)

Question 3

Which of the following compounds is the strongest acid?

Accepted Answer

A)   CH3COOH
B)   FCH2COOH
C)   ClCH2COOH
D)   BrCH2COOHE) All of the above
F) A) and B)

Question 4

Which of the following compounds is the strongest acid?

Accepted Answer

A)   HF
B)   H2O
C)   NH3
D)   CH4E) None of the above
F) All of the above

Question 5

Which of the following compounds has the lowest pKa?

Accepted Answer

A)   H2O
B)   H2S
C)   H2Se
D)   H2TeE) A) and C)
F) B) and C)

Question 6

Which of the following concepts can be used to rationalize the observation that acetic acid is a stronger acid than methanol?

Accepted Answer

A)   electronegativity
B)   resonance
C)   valence shell electron pair repulsion theory
D)   Pauli exclusion principleE) A) and B)
F) A) and D)

Question 7

The pKa of HCl is ?7. What is the value of the equilibrium constant, Keq, for the following equilibrium? [The concentration of water in a dilute aqueous solution is 55 M]  HCl+H2O⇌H3O⊕+Cl⊖\mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{\oplus}+\mathrm{Cl}^{\ominus}HCl+H2​O⇌H3​O⊕+Cl⊖

Accepted Answer

A)   1.8 × 105
B)   385
C)   1.8 × 10?5
D)   ?1.8 × 105 E) A) and B)
F) A) and D)

Question 8

Which of the following statements is not true?

Accepted Answer

A)   The position of the equilibrium for an exergonic reaction favors products
B)   The products of an exergonic reaction have a higher Gibbs free energy than the reactants.
C)   The equilibrium constant of a reaction for which ΔG° = 0 is 1.
D)   ΔG° = ΔH° − TΔS°E) B) and C)
F) B) and D)

Question 9

Match the types of reactions with the most appropriate relationships.
-ΔGproduct reactant

Accepted Answer

A)  Exergonic Reaction
B)  Endergonic Reaction
C)  Exothermic Reaction
D)  Endothermic ReactionE) B) and C)
F) B) and D)

Question 10

Which of the following is a feature of a Lewis base?

Accepted Answer

A)   proton donor
B)   proton acceptor
C)   electron pair donor
D)   electron pair acceptorE) None of the above
F) C) and D)

Question 11

Match the types of reactions with the most appropriate relationships.
-ΔHproduct reactant

Accepted Answer

A)  Exergonic Reaction
B)  Endergonic Reaction
C)  Exothermic Reaction
D)  Endothermic ReactionE) A) and D)
F) B) and C)

Question 12

Which of the following compounds is the strongest acid?

Accepted Answer

A)   CH3COOH
B)   ClCH2COOH
C)   CH3CH2OH
D)   ClCH2CH2OHE) None of the above
F) A) and C)

Question 13

Which of the following energy diagrams represents the slowest reaction?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and C)
F) A) and B)

Question 14

Use curved arrows to show the movement of pairs of electrons in the following acid-base reaction and show the structures of the conjugate acid and conjugate base.

Accepted Answer

The answer of Use curved arrows to show the movement...

Question 15

Which of the following is a definition of the rate-determining step of a reaction mechanism?

Accepted Answer

A)   the first step
B)   the last step
C)   the step that crosses the highest energy barrier
D)   the most exothermic stepE) A) and C)
F) None of the above

Question 16

Which of the following energy diagrams represents the fastest reaction?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and D)
F) None of the above

Question 17

The structure of the alkaloid ephedrine is shown below. When ephedrine is placed in the presence of an acid, the -OH group will be protonated.

Accepted Answer

A) True 
 B)False

Question 18

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery.  When indole is placed in the presence of a strong base the nitrogen atom will be deprotonated.

Accepted Answer

A) True 
 B)False

Question 19

What is the approximate pKa value of acetic acid?

Accepted Answer

A)   −7
B)   5
C)   16
D)   51E) A) and B)
F) A) and C)

Question 20

Consider the following reaction coordinate diagram.  The transition state is represented by the letter B.

Accepted Answer

A) True 
 B)False

Exam 4: Acids and Bases

Which of the following compounds is the strongest acid?

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Consider the following reaction coordinate diagram. The transition state is represented by the letter B.

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Which of the following compounds is the strongest acid?

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Which of the following energy diagrams represents the fastest reaction?

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Which of the following is a feature of a Lewis base?

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Which of the following concepts can be used to rationalize the observation that acetic acid is a stronger acid than methanol?

Correct AnswerverifiedShow Answer

Which of the following has the highest bond dissociation energy?

Correct AnswerverifiedShow Answer

Use curved arrows to show the movement of pairs of electrons in the following acid-base reaction and show the structures of the conjugate acid and conjugate base.

Correct AnswerverifiedShow Answer

What is the approximate pKa value of acetic acid?

Correct AnswerverifiedShow Answer

Which of the following terms describes the role of ethanol in the acid-base reaction shown?

Correct AnswerverifiedShow Answer

Which of the following compounds is the strongest acid?

Correct AnswerverifiedShow Answer

Match the types of reactions with the most appropriate relationships. -ΔHproduct < ΔHreactant

Correct AnswerverifiedShow Answer

The structure of the alkaloid ephedrine is shown below. When ephedrine is placed in the presence of an acid, the -OH group will be protonated.

Correct AnswerverifiedShow Answer

Match the types of reactions with the most appropriate relationships. -ΔGproduct < ΔGreactant

Correct AnswerverifiedShow Answer

Which of the following energy diagrams represents the slowest reaction?

Correct AnswerverifiedShow Answer

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery. When indole is placed in the presence of a strong base the nitrogen atom will be deprotonated.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements is not true?

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Which of the following compounds has the lowest pKa?

Correct AnswerverifiedShow Answer

Which of the following is a definition of the rate-determining step of a reaction mechanism?

Correct AnswerverifiedShow Answer

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What is the approximate pK_a value of acetic acid?

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Match the types of reactions with the most appropriate relationships. -ΔH_product < ΔH_reactant

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Match the types of reactions with the most appropriate relationships. -ΔG_product < ΔG_reactant

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Which of the following compounds has the lowest pK_a?

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