Question 1

Which of the following statements about peptide bond hydrolysis in water is correct, based on the kinetics and thermodynamics discussed in the study materials?

Accepted Answer

Peptide bond hydrolysis is thermodynamically favorable but occurs extremely slowly without a catalyst.

Question 2

For the reaction $$2A + B \rightarrow C$$, which statement best describes the relationship between the rate of consumption of A and the rate of formation of C?

Accepted Answer

A is consumed at twice the rate of C formation.

Question 3

As the concentration of hydrogen peroxide ($$H_2O_2) $$decreases during its decomposition, what happens to the rate of the reaction?

Accepted Answer

The rate decreases.

Question 4

Which of the following would change the value of the rate constant $$k$$ for the reaction $$2NO_2 + F_2$ \rightarrow 2NO_2F$$?

Accepted Answer

Increasing the temperature.

Question 5

A reaction follows zero-order kinetics with respect to substrate concentration. Which scenario best explains this behavior?

Accepted Answer

The enzyme is saturated with substrate, so the rate is independent of substrate concentration.

Question 6

Caffeine is metabolized via first-order kinetics. If the half-life of caffeine in the body is 3 hours, how much caffeine remains after 12 hours if you start with 100 mg?

Accepted Answer

6.25 mg

Question 7

Which of the following reactions would you expect to have $$K_c = K_p$$?

Accepted Answer

I$$_2(g) + Cl$_2(g$$) $$\rightleftharpoons 2 $$ICl(g)

Question 8

Which of the following will cause a shift in equilibrium for the reaction $$NaCl(s) \rightleftharpoons Na^+(aq) + Cl^-(aq) in a $$saturated solution?

Accepted Answer

Removing $$Na^+(aq) or$$ $$Cl^-(aq)$$ from the solution.

Question 9

For the equilibrium $$CaCO_3(s$$) \rightleftharpoons CaO(s) + $$CO_2(g$$)$$, which system cannot reach equilibrium?

Accepted Answer

$$CaO$$ and a $$CO_2$$ pressure greater than the value of $$K_P$$

Question 10

Which mixture would create the most effective buffer solution once at equilibrium?

Accepted Answer

0.200M HNO$$_2$$ and 0.200M NaNO$$_3$$

Question 11

Which acid would be best to combine with its sodium salt to buffer blood at pH 7.4?

Accepted Answer

Carbonic acid (pKa = 6.4)

Question 12

What is the correct expression for the equilibrium constant ($$K_c) $$for the dissociation of acetic acid ($$CH_3COOH) in $$water?

Accepted Answer

$$K_c = \frac{[CH_3COO^-][H_3O^+]}{[CH_3COOH]}$$

Question 13

Which of the following is a conjugate acid/base pair?

Accepted Answer

H$$_2CO$_3$$ and HCO$$_3^-$$

Question 14

Which statement about the relationship between $$K_a$$ and $$K_b$$ for a conjugate acid-base pair is correct?

Accepted Answer

$$K_a 	imes K_b = K_w$$

Question 15

Which of the following reactions will result in an increase in entropy?

Accepted Answer

All of these reactions increase entropy.

Question 16

Which molecule has the largest molar entropy?

Accepted Answer

CO$$_2(g)$$

Question 17

For the reaction $$3 H_2$(g) + N_2$(g) \rightarrow 2 NH_3$(g)$$ with $$\Delta H = -92 kJ/$$mol and $$\Delta S = -198.45 J/$$mol·K, under what conditions is the reaction spontaneous?

Accepted Answer

Spontaneous only at temperatures below 463 K.

Question 18

Which of the following statements about redox reactions is correct?

Accepted Answer

The species that undergoes oxidation is the reducing agent.

Question 19

Which of the following can be reduced by Ni(s) based on standard electrode potentials?

Accepted Answer

Cu$$^{2+}(aq) $$and I$$_2(s)$$

General Chemistry Study Guide: Chemical Kinetics, Equilibrium, Thermodynamics, Acids/Bases, and Electrochemistry

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