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Practice Questions
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8.1 Energy Diagrams
 
8.2 Equilibrium
 
8.3 Le Chatelier’s Principle
 
 
8.4 Practice Questions
 
8.5 Explanations
 
Practice Questions
Use the following diagram to answer questions 1–3:
1. Which letter corresponds to the activation energy of the reaction?
(A) A
(B) B
(C) C
(D) Y
(E) X
2. Which letter corresponds to the change in energy for the overall reaction?
(A) A
(B) B
(C) C
(D) Y
(E) X
Statement I Statement II
3. The reaction shown above is exothermic.   BECAUSE   Energy difference B is greater than energy difference A.
4. A system is at equilibrium when the rate of the forward reaction is equal to the rate of the reverse reactions.   BECAUSE   At equilibrium, the concentration of the products is equal to that of the reactants.
5. Which of the following statements best describes the condition(s) needed for a successful formation of a product in a chemical reaction?
(A) The collision must involve a sufficient amount of energy, provided from the motion of the particles, to overcome the activation energy.
(B) The relative orientation of the particles has little or no effect on the formation of the product.
(C) The relative orientation of the particles has an effect only if the kinetic energy of the particles is below some minimum value.
(D) The relative orientation of the particles must allow for formation of the new bonds in the product.
(E) The energy of the incoming particles must be above a certain minimum value and the relative orientation of the particles must allow for formation of new bonds in the product.
6. The catalyzed pathway in a reaction mechanism has a _____ activation energy and thus causes a _____ reaction rate.
(A) higher, lower
(B) higher, higher
(C) lower, higher
(D) lower, steady
(E) higher, steady
7. Write the equilibrium expression for the following reaction:
(A) [A]2[B][D]
(B)
(C)
(D)
(E)
8. If at a given temperature the equilibrium constant for the reactionis Kp, the equilibrium constant for the reactioncan be represented as
(A)
(B)
(C)
(D)
(E)
9. The value of the equilibrium constant, K, is dependent on
  I. The temperature of the system
 II. The concentration of the reactants
III. The concentration of the products
IV. The nature of the reactants and products
(A) I, II
(B) II, III
(C) III, IV
(D) I and IV
(E) I, II, and IV
10. Consider the system below at equilibrium. Which of the following changes will shift the equilibrium to the right?
  I. Increasing the temperature
 II. Decreasing the temperature
III. Increasing the pressure on the system
(A) I only
(B) II only
(C) III only
(D) I and III
(E) II and III
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