Unit 16 Study Guide

Unit 16 Study Guide
1. Which of the following statements concerning equilibrium is not true? A) A system that is disturbed from an equilibrium condition responds in a manner to restore equilibrium. B) Equilibrium in molecular systems is dynamic, with two opposing processes balancing one another. C) The value of the equilibrium constant for a given reaction mixture is the same regardless of the direction from which equilibrium is attained. D) A system moves spontaneously toward a state of equilibrium. E) The equilibrium constant is independent of temperature.

2. Which of the following statements is true? A) When two opposing processes are proceeding at identical rates, the system is at equilibrium.
C) The concentration of the products equals that of reactants and is constant at equilibrium. D) An endothermic reaction shifts toward reactants when heat is added to the reaction. E) None of the above statements is true.

3. Indicate the mass action expression for the following reaction: 2X(g) + Y(g) [pic] 3W(g) + V(g) A) [X]2[Y][W]3[V] B) [pic] C) [pic] D) [pic]

4. If, at a given temperature, the equilibrium constant for the reaction H2(g) + Cl2(g) [pic] 2HCl(g) is Kp, then the equilibrium constant for the reaction HCl(g) [pic](1/2) H2(g) + (1/2)Cl2 (g) can be represented as: A) [pic] B) Kp2 C) [pic] D) [pic]

5. The value of the equilibrium constant , K, is dependent on
I. The temperature of the system.
II. The nature of the reactants and products.
III. The concentration of the reactants.
IV The concentration of the
The value for K at 700.oC for the formation of ammonia is: A) 1.1e–1 B) 6.8e–2 C) 7.1e–3 D) 3.6e–1 E) none of these

32. Consider the reaction [pic][pic][pic]At 1273 K, the Kp value is 167.5. What is the [pic] at equilibrium if the [pic] is 0.18 atm at this temperature? A) 2.7 atm B) 0.18 atm C) 11 atm D) 5.5 atm E) 7.8 atm

33. Which of the following is true for a system whose equilibrium constant is relatively small? A) It will take a short time to reach equilibrium. B) It will take a long time to reach equilibrium. C) The equilibrium lies to the left. D) The equilibrium lies to the right. E) Two of these.

34. The reaction quotient for a system is 7.2 × 102. If the equilibrium constant for the system is 36, what will happen as equilibrium is approached? A) There will be a net gain in product. B) There will be a net gain in reactant. C) There will be a net gain in both product and reactant. D) There will be no net gain in either product or reactant. E) The equilibrium constant will decrease until it equals the reaction