Question 1

Which of the following best describes the role of an enzyme in a chemical reaction?

Accepted Answer

It lowers the activation energy, increasing the reaction rate.

Question 2

Given the reaction: $$2NO_2(g) \rightarrow 2NO(g) + O_2$(g)$$, what is the rate law if the reaction is first order with respect to $$NO_2$$?

Accepted Answer

$$rate = k[NO_2$]$$

Question 3

Which of the following aqueous solutions will have the lowest freezing point? Assume ideal behavior.

Accepted Answer

0.10 m $$CaCl_2$$

Question 4

A solution is prepared by dissolving 0.5 mol of glucose in 1 kg of water. If $$K_f$$ for water is $$1.86 \ \mathrm{^	ext{o}C \cdot kg/mol}$$, what is the freezing point depression?

Accepted Answer

$$0.93 \ \mathrm{^	ext{o}C}$$

Question 5

Which of the following statements about catalysts is correct?

Accepted Answer

Catalysts provide an alternative pathway with lower activation energy.

Question 6

Which of the following is the correct integrated rate law for a first-order reaction?

Accepted Answer

$$\ln [A] = -kt + \ln [A]_0$$

Question 7

A reaction has a rate constant $$k = 0.693 \ 	ext{day}^{-1}. $$What is the half-life of the reaction?

Accepted Answer

$$1.00 \ 	ext{day}$$

Question 8

Which of the following best describes the effect of increasing temperature on the rate of a chemical reaction?

Accepted Answer

The rate increases because more molecules have energy greater than the activation energy.

Question 9

For the reaction $$A ightarrow B$$, the activation energy is $$50 \ 	ext{kJ/mol}. If $$the temperature increases from $$300 \ 	ext{K} to$$ $$310 \ 	ext{K}$$, what happens to the rate constant?

Accepted Answer

It increases.

Question 10

Which of the following is true for a reaction mechanism?

Accepted Answer

The slowest step determines the overall rate law.

Question 11

A solution contains $$2.00 \ 	ext{g} of an $$unknown protein in $$20.0 \ 	ext{mL}$$ solution and has an osmotic pressure of $$2.57 \ 	ext{atm} at$$ $$27 \ ^\circ 	ext{C}. $$What is the molar mass of the protein? ($$R = 0.0821 \ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K})$$

Accepted Answer

$$1910 \ 	ext{g/mol}$$

Question 12

Which of the following plots will yield a straight line for a first-order reaction?

Accepted Answer

$$\ln [A] vs. $$time

Question 13

Which of the following statements about colligative properties is correct?

Accepted Answer

They depend on the number of solute particles.

Question 14

The rate law for a reaction is $$rate = k[A][B]^2. If$$ $$[A] is $$doubled and $$[B] is $$tripled, by what factor does the rate increase?

Accepted Answer

18

Question 15

Which of the following is the correct expression for the freezing point depression?

Accepted Answer

$$\Delta T_f = K_f m$$

Question 16

Which of the following is NOT a colligative property?

Accepted Answer

Viscosity

Question 17

A reaction is endothermic if:

Accepted Answer

The products have higher energy than the reactants.

Question 18

Which of the following best describes the effect of a nonvolatile solute on the vapor pressure of a solvent?

Accepted Answer

It decreases the vapor pressure.

Question 19

Which of the following is the correct equation for osmotic pressure?

Accepted Answer

$$\pi = MRT$$

Question 20

Which of the following is the correct expression for Henry's Law?

Accepted Answer

$$C = kP$$

General Chemistry II: Chemical Kinetics, Equilibrium, and Solutions – Exam Study Guide

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