Ap Chem Questions

46. A sample of H2S gas is placed in an evacuated, sealed container and heated until the following decomposition reaction occurs ay 1000K:

2 H2s(g) →2 H2 + S2 Kc=1.0x10^-6

Which of the following represents the equilibrium constant for this reaction?

Correct Answer: A

47. Which of the following graphs would best represent the change in concentration of the various species involved in the reaction over time?

Correct Answer: C

48. Which option best describes what will immediately occur to the reaction rates if the pressure on the system is increased after it has reached equilibrium?

(A) The rate of both the forward and reverse reactions will increase.

(B) The rate of the forward reaction will increase while the rate of the reverse reaction decreases.

(C) The rate of the forward reaction will decrease while the rate of the reverse reaction increases.

(D) Neither the rate of the forward nor reverse reactions will change.

Correct Answer C

49. If, at a given point in the reaction, the value for the reaction quotient Q is determined to be 2.5x10^-8, which of the following is occurring?

(A) The concentration of the react is decreasing while the concentration of the products is increasing.

(B) The concentration of the reactant is increasing while the concentration of the products is decreasing

(C) The system has passed the equilibrium point and the concentration of all species involved in the reaction will remain constant.

(D) The concentration of all species involved is changing at the same rate.

Correct Answer: A

50. As the reaction progresses at a constant temperature of 1,000K, how does the value for the Gibbs free energy constant for the reaction change?

(A) It stays constant.

(B) It increases exponentially.

(C) It increases linearly.

(D) It decreases exponentially.

Correct Answer: A

51. An unknown substance is found to...