Question 1

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 base 
A) Brønsted-Lowry acid 
B) Brønsted-Lowry base 
C) Lewis acid 
D) Lewis base A

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 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 base 
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 base B

Question 4

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

Accepted Answer

A) CH3COOH 
B) AlCl3 
C) H2O 
D) CH3OH 
A) CH3COOH 
B) AlCl3 
C) H2O 
D) CH3OH

Question 5

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

Accepted Answer

Question 6

Which of the following anions is the strongest base?

Accepted Answer

A) NH2- 
B) NH3 
C) CH3CH=N- 
D) CH3C$\equiv$N 
A) NH2- 
B) NH3 
C) CH3CH=N- 
D) CH3C$\equiv$N

Question 7

Which of the following compounds is the strongest acid?

Accepted Answer

A) HF 
B) H2O 
C) NH3 
D) CH4 
A) HF 
B) H2O 
C) NH3 
D) CH4

Question 8

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 9

Which of the following energy diagrams represents the slowest reaction?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 10

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+ 
A) OH- 
B) H3O+ 
C) CH3COOH 
D) CH3COOH+

Question 11

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]

Accepted Answer

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

Question 12

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

Accepted Answer

log₁₀K_eq = pK_a(acid) - pK

Question 13

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 > NaNMe2 
A) NH3 > MeNH2 > H2O > HF 
B) MeNH2 > NH3 > MeOH > CH4 
C) NH3 > Me3N > H2O > MeOH 
D) CH3COONa > NaOH > NaOMe > NaNMe2

Question 14

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 step 
A) the first step 
B) the last step 
C) the step that crosses the highest energy barrier 
D) the most exothermic step

Question 15

Which of the following compounds is the strongest acid?

Accepted Answer

A) CH3COOH 
B) ClCH2COOH 
C) CH3CH2OH 
D) ClCH2CH2OH 
A) CH3COOH 
B) ClCH2COOH 
C) CH3CH2OH 
D) ClCH2CH2OH

Question 16

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

Accepted Answer

A) True 
 B)False

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

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

Accepted Answer

A) CH3CH3 
B) CH2=CH2 
C) HC$\equiv$CH 
D) CH3CH2OH 
A) CH3CH3 
B) CH2=CH2 
C) HC$\equiv$CH 
D) CH3CH2OH

Question 19

Which of the following anions is the strongest base?

Accepted Answer

A) CH3COO- 
B) HO- 
C) NH2- 
D) Cl- 
A) CH3COO- 
B) HO- 
C) NH2- 
D) Cl-

Question 20

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 acceptor 
A) proton donor 
B) proton acceptor 
C) electron pair donor 
D) electron pair acceptor

Exam 4: Acids and Bases

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

Which acid has the smallest Ka?

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

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

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

Which of the following anions is the strongest base?

Which of the following compounds is the strongest acid?

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

Which of the following energy diagrams represents the slowest reaction?

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

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]

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

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

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

Which of the following compounds is the strongest acid?

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

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.

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

Which of the following anions is the strongest base?

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

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

Which acid has the smallest K_a?

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

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

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]

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