Question 1

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

Accepted Answer

The vapor pressure of the solution decreases because the solute particles occupy surface area.

Question 2

A solution is prepared by dissolving 10.0 g of NaCl in 100.0 g of water. Which equation would you use to calculate the boiling point elevation?

Accepted Answer

$$\Delta T_b = K_b \cdot m \cdot i$$

Question 3

Which of the following statements about the second law of thermodynamics is correct?

Accepted Answer

The entropy of the universe increases in a spontaneous process.

Question 4

A reaction has $$\Delta H = -100 \ \mathrm{kJ}$$ and $$\Delta S = -200 \ \mathrm{J/K}. At $$what temperature does the reaction change from spontaneous to nonspontaneous?

Accepted Answer

$$T = 500 \ \mathrm{K}$$

Question 5

Which of the following is the correct expression for the equilibrium constant $$K_c$$ for the reaction $$2\mathrm{NO}_2(g) \rightleftharpoons 2\mathrm{NO}(g) + \mathrm{O}_2(g)$$?

Accepted Answer

$$K_c = \frac{[\mathrm{NO}]^2[\mathrm{O}_2]}{[\mathrm{NO}_2]^2}$$

Question 6

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because its molecules are arranged in an open hexagonal structure.

Question 7

Which of the following is a correct statement about buffer solutions?

Accepted Answer

A buffer solution resists changes in pH when small amounts of acid or base are added.

Question 8

A student mixes 0.10 M acetic acid and 0.10 M sodium acetate. Which equation should be used to calculate the pH of the resulting buffer?

Accepted Answer

$$\mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[\mathrm{A}^-]}{[\mathrm{HA}]} \right)$$

Question 9

Which of the following best describes the effect of increasing temperature on the solubility of most solid salts in water?

Accepted Answer

Solubility increases with increasing temperature.

Question 10

Which of the following is the correct Nernst equation for calculating the cell potential under nonstandard conditions?

Accepted Answer

$$E = E^\circ - \frac{0.0592}{n} \log Q$$

Question 11

A reaction is exothermic and has an increase in entropy. Which of the following statements is true about the spontaneity of the reaction?

Accepted Answer

The reaction is spontaneous at all temperatures.

Question 12

Which of the following is the correct expression for the solubility product constant ($$K_{sp}) $$for $$\mathrm{CaF}_2$$?

Accepted Answer

$$K_{sp} = [\mathrm{Ca}^{2+}][\mathrm{F}^-]^2$$

Question 13

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

A catalyst decreases the activation energy, increasing the reaction rate.

Question 14

Which of the following is the correct balanced equation for the oxidation of glucose in cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O}$$

Question 15

Which of the following is the correct formula for calculating the pH of a strong acid solution?

Accepted Answer

$$\mathrm{pH} = -\log [\mathrm{H}^+]$$

Question 16

Which of the following best describes the relationship between Gibbs free energy and equilibrium?

Accepted Answer

At equilibrium, $$\Delta G = 0.$$

Question 17

Which of the following is the correct equation for the Henderson-Hasselbalch equation?

Accepted Answer

$$\mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[\mathrm{A}^-]}{[\mathrm{HA}]} \right)$$

Question 18

Which of the following is the correct expression for the rate law of a reaction that is first order in A and second order in B?

Accepted Answer

$$	ext{Rate} = k[A][B]^2$$

Honors General Chemistry 2 Syllabus and Topical Outline Study Guide

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