Q: Which of the following is the correct expression for the solubility product constant ($$K_{sp}) $$for $$\text{AgCl}$$?

$$K_{sp} = [\text{Ag}^+][\text{Cl}^-]$$

Question 1

Which of the following statements best describes the role of intermolecular forces in determining the boiling point of a liquid?

Accepted Answer

Stronger intermolecular forces result in a higher boiling point.

Question 2

A sample of water is heated from 25°C to 100°C at 1 atm. Which phase change occurs at 100°C, and what is the name of the process?

Accepted Answer

Vaporization; liquid to gas

Question 3

Which equation is used to relate the vapor pressure of a liquid to temperature, and what is its general form?

Accepted Answer

$$\ln P = -\frac{\Delta H_{vap}}{R} \left( \frac{1}{T} \right) + C$$

Question 4

Which of the following best describes a buffer solution?

Accepted Answer

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

Question 5

A reaction is found to be first order with respect to reactant A. Which integrated rate law should be used to determine the concentration of A at any time t?

Accepted Answer

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

Question 6

Which of the following is true about catalysts in chemical reactions?

Accepted Answer

Catalysts lower the activation energy, increasing the reaction rate.

Question 7

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 decreases.

Question 8

Given the following equilibrium: $$	ext{N}_2(g) + 3	ext{H}_2(g) ightleftharpoons 2	ext{NH}_3(g)$$, what will happen if the pressure is increased by decreasing the volume?

Accepted Answer

The equilibrium will shift toward the side with fewer moles of gas.

Question 9

Which of the following is the correct expression for the solubility product constant ($$K_{sp}) $$for $$	ext{AgCl}$$?

Accepted Answer

$$K_{sp} = [	ext{Ag}^+][	ext{Cl}^-]$$

Question 10

A solution is prepared by dissolving 0.10 mol of NaCl in 1.0 L of water. Which colligative property will be affected, and how?

Accepted Answer

The boiling point will increase.

Question 11

Which of the following is the correct form of the Arrhenius equation?

Accepted Answer

$$k = A e$$^{-E_a/RT}$$

Question 12

Which of the following statements about entropy ($$S) is $$correct?

Accepted Answer

Entropy is a measure of the disorder or randomness of a system.

Question 13

Which of the following is the correct equation for Gibbs free energy change?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 14

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred.

Question 15

Which of the following is the correct cell notation for a galvanic cell based on the reaction: $$	ext{Zn}(s) + 	ext{Cu}^{2+}(aq) ightarrow 	ext{Zn}^{2+}(aq) + 	ext{Cu}(s)$$?

Accepted Answer

$$	ext{Zn}(s) | 	ext{Zn}^{2+}(aq) || 	ext{Cu}^{2+}(aq) | 	ext{Cu}(s)$$

Question 16

Which of the following is true about the autoionization of water?

Accepted Answer

It produces equal concentrations of $$	ext{H}_3	ext{O}^+$$ and $$	ext{OH}^- at 25$$°C.

Question 17

A radioactive isotope decays with a half-life of 10 years. If you start with 80 g, how much remains after 30 years?

Accepted Answer

10 g

Question 18

Which of the following best describes the effect of a catalyst on the activation energy and the rate of a reaction?

Accepted Answer

A catalyst decreases the activation energy and increases the rate.

Question 19

Which of the following is the correct relationship between the equilibrium constant $$K$$ and Gibbs free energy change $$\Delta G^\circ$$?

Accepted Answer

$$\Delta G^\circ = -RT \ln K$$

Question 20

Which of the following is a correct statement about Le Chatelier’s Principle?

Accepted Answer

If a system at equilibrium is disturbed, the system will shift to minimize the disturbance.

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