Quiz Review Unit 5 Lesson 2

E.

Decreasing the temperature of an endothermic equilibrium system A. shifts the equilibrium toward the products. E. shifts the equilibrium toward the reactants. C. does not shift the equilibrium.

A.

Historically, sulfur dioxide, SO2, generated from the burning of coal has been a major precursor to acid precipitation by way of its conversion to sulfur trioxide, SO3, and its subsequent reaction with water. Imagine you have a sealed vessel containing the following equilibrium system: 2SO3(g) ⇋ 2SO2(g) + O2(g) Select the correct terms to complete the statement about how the equilibrium will shift under the following conditions. Decreasing the volume of the container will produce more A. SO3 B. SO2 C. O2 D. SO2 and O2.

D.

Historically, sulfur dioxide, SO2, generated from the burning of coal has been a major precursor to acid precipitation by way of its conversion to sulfur trioxide, SO3, and its subsequent reaction with water. Imagine you have a sealed vessel containing the following equilibrium system: 2SO3(g) ⇋ 2SO2(g) + O2(g) Select the correct terms to complete the statement about how the equilibrium will shift under the following conditions. Decreasing the pressure of the container will produce more A. SO3 B. SO2 C. O2 D. SO2 and O2

F.

Increasing the concentration of a reactant in an equilibrium system A. shifts the equilibrium toward the products. F. shifts the equilibrium toward the reactants. C. does not shift the equilibrium.

C.

Select the correct terms to complete the statement about the pH scale. . The pH can be calculated by finding A. log[H3O+ ] B. log[OH− ] C. −log[H3O+ ] D. −log[OH- ].

B.

Select the correct terms to complete the statement about the pH scale. The pH of a solution is a measure of the concentration of the __________________________ it contains. A. hydroxide ion B. hydronium ions

A.

The pH of milk is about 6.6, so milk is A. acidic E. basic C. neutral

B.

The pH of soapy water is about 12, so soapy water is E. acidic B. basic C. neutral

D.

Under what conditions will increasing the pressure on a gaseous equilibrium system shift the equilibrium? Select all correct answers. a. A shift will further increase the pressure on a system. b. A shift will decrease the pressure on a system. c. A shift will increase the number of molecules in the system. d. A shift will decrease the number of molecules in the system. e. There are an unequal number of moles in the reactants and the products. f. There are an equal number of moles in the reactants and the products. A. a,b,c B. b,c,d C. d,e,f D. b,d,e

C.

Which of the following are true of a chemical reaction at equilibrium? Select all correct answers. a. The forward and reverse reactions proceed at the same rate. b. The concentrations of the reactants and the products are the same. c. The rate of the forward reaction is greater than the rate of the reverse reaction. d.. The concentrations of the reactants may differ from those of the products. A. a,c,d B. c,d C. a,d D. a,b,c

B.

Which of the following examples involve an acid-base equilibrium system? Select all correct answers. a. a weak base reacting with water b. a strong acid reacting with water c. a strong acid reacting with a weak base dissolved in water d. a strong base reacting with a strong acid dissolved in water A. a,b B. a,c C. b,c D. c,d

C.

Which of these shows an acid followed by its conjugate base? A. HSO4 − , H2SO4 B. HCl, NaCl C. HCO3 − , CO3 2− D. H2O, H3O+