Question 1

The pKa of acetic acid, CH3COOH, is 4.76. 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] a of acetic acid, CH3COOH, is 4.76. 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]   A)  3.2 * 107  B)  -3.2 * 10-7  C)  -3.2 * 107  D)  3.2 *10-7 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  "3.2 * 107"
B)  "-3.2 * 10-7"
C)  "-3.2 * 107"
D)  "3.2 *10-7"E) A) and B)
F) B) and C)

Question 2

Which acid has the smallest Ka?

Accepted Answer

ethanol
Consider the following terms. Use these as appropriate to complete the following statements.
transition state
endergonic
exergonic
free energy of activation
Gibbs free energy changes
reaction intermediate

Question 3

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

Accepted Answer

A)  proton donor
B)  proton acceptor
C)  electron pair donor
D)  electron pair acceptorE) A) and C)
F) A) and B)

Question 4

Consider the following reaction coordinate diagram.  The free energy of activation is represented by the letter C.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is a Lewis acid but not a Brønsted-Lowry acid?

Accepted Answer

A)  CH3COOH
B)  AlCl3
C)  H2O
D)  CH3OHE) A) and B)
F) A) and C)

Question 6

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

Accepted Answer

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

Question 7

Provide the equation that relates the acid dissociation constant, Ka, to the pKa of an acid.

Accepted Answer

Question 8

Which of the following anions is the strongest base?

Accepted Answer

A)  NH2-
B)  NH3
C)  CH3CH=N-
D)  CH3C ≡\equiv≡ N E) B) and D)
F) A) and C)

Question 9

Which of the following terms describes the reactivity of trimethylamine, (CH3) 3N?

Accepted Answer

A)  Brønsted-Lowry acid and Lewis acid
B)  Brønsted-Lowry base and Lewis base
C)  Lewis acid and not a Brønsted-Lowry acid
D)  Lewis base and not a Brønsted-Lowry baseE) A) and B)
F) All of the above B

Question 10

What is the value of the equilibrium constant for the following equilibrium?

Accepted Answer

log₁₀K_eq = pK_a(acid) - pK...

Question 11

Which of the following is the correct order of decreasing basicity (stronger base > weaker base) ?

Accepted Answer

A)  NH3 > MeNH2 > H2O > HF
B)  MeNH2 > NH3 > MeOH > CH4
C)  NH3 > Me3N > H2O > MeOH
D)  CH3COONa > NaOH > NaOMe > NaNMe2E) None of the above
F) A) and B)

Question 12

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) All of the above
F) A) and C)

Question 13

Which of the following has a pKa value of approximately 25?

Accepted Answer

A)  CH3CH3
B)  CH2=CH2
C)  HC ≡\equiv≡ CH
D)  CH3CH2OH E) A) and B)
F) C) and D)

Question 14

Which of the following is present in the highest concentration upon dissolution of acetic acid in water?

Accepted Answer

A)  OH-
B)  H3O+
C)  CH3COOH
D)  CH3COOH+E) All of the above
F) A) and B)

Question 15

A reaction in which the free energy of the products is greater than the reactants is termed____________________ .

Accepted Answer

The answer of A reaction in which the free energy...

Question 16

Which of the following anions is the strongest base?

Accepted Answer

A)  CH3COO-
B)  HO-
C)  NH2-
D)  Cl-E) B) and C)
F) A) and B)

Question 17

Which of the following energy diagrams represents the slowest reaction?

Accepted Answer

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

Question 18

Which of the following compounds is the strongest acid?

Accepted Answer

A)  HF
B)  H2O
C)  NH3
D)  CH4E) C) and D)
F) B) and D)

Question 19

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CH3COOH
B)  ClCH2COOH
C)  CH3CH2OH
D)  ClCH2CH2OHE) A) and B)
F) B) and D)

Question 20

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

Exam 4: Acids and Bases

The pKa of acetic acid, CH3COOH, is 4.76. 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]

Correct AnswerverifiedShow Answer

Which acid has the smallest Ka?

Correct Answerverifiedethanol Consider the following terms. Use these as appropriate to complete the following statements. transition state endergonic exergonic free energy of activation Gibbs free energy changes reaction intermediate

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

Correct AnswerverifiedShow Answer

Consider the following reaction coordinate diagram. The free energy of activation is represented by the letter C.

Correct AnswerverifiedShow Answer

Which of the following is a Lewis acid but not a Brønsted-Lowry acid?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

Provide the equation that relates the acid dissociation constant, Ka, to the pKa of an acid.

Correct AnswerverifiedShow Answer

Which of the following anions is the strongest base?

Correct AnswerverifiedShow Answer

Which of the following terms describes the reactivity of trimethylamine, (CH3) 3N?

Correct AnswerverifiedB

What is the value of the equilibrium constant for the following equilibrium?

Correct Answerverifiedlog10Keq = pKa(acid) - pK...View AnswerShow Answer

Which of the following is the correct order of decreasing basicity (stronger base > weaker base) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following has a pKa value of approximately 25?

Correct AnswerverifiedShow Answer

Which of the following is present in the highest concentration upon dissolution of acetic acid in water?

Correct AnswerverifiedShow Answer

A reaction in which the free energy of the products is greater than the reactants is termed____________________ .

Correct AnswerverifiedShow Answer

Which of the following anions is the strongest base?

Correct AnswerverifiedShow Answer

Which of the following energy diagrams represents the slowest reaction?

Correct AnswerverifiedShow Answer

Which of the following compounds is the strongest acid?

Correct AnswerverifiedShow Answer

Which of the following compounds is the strongest acid?

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

The pK_a of acetic acid, CH₃COOH, is 4.76. What is the value of the equilibrium constant K_eq, for the following equilibrium? [The concentration of water in a dilute aqueous solution is 55 M]

Correct Answer
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Which acid has the smallest K_a?

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ethanol Consider the following terms. Use these as appropriate to complete the following statements. transition state endergonic exergonic free energy of activation Gibbs free energy changes reaction intermediate

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A

Provide the equation that relates the acid dissociation constant, K_a, to the pK_a of an acid.

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Which of the following terms describes the reactivity of trimethylamine, (CH₃) ₃N?

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B

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log₁₀K_eq = pK_a(acid) - pK...
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Which of the following has a pK_a value of approximately 25?

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