AP QUIZZES - AP TOPIC 13 Equilibrium SET D
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QUESTION 1. Consider the equilibrium below. The equilibrium position can be moved to the product side by performing which of the following?

CO(g) + 2H2(g) <==> CH3OH(g)


(A) Decreasing the pressure
(B) Adding more methanol (CH3OH(g))
(C) Adding a catalyst
(D) Adding more hydrogen
(E) None of the above

QUESTION 2. Consider the reaction below. As the temperature of the equilibrium mixture is increased, it is found that the % of N2O4 in the equilibrium mixture increases. What can be deduced about the enthalpy change in this reaction?

N2O4(g) <==> 2NO2(g)


(A) The forward reaction is exothermic
(B) The backward reaction is exothermic
(C) Delta H = 0
(D) Nothing
(E) None of the above

QUESTION 3. When a chemical reaction has reached a state of dynamic equilibrium, which of the following statements is true?

(A) The forward reaction has stopped
(B) Reactants form products as fast as products form reactants
(C) Reactants and products are present in equal concentrations
(D) The position of equilibrium can be altered by adding a catalyst
(E) The rates of the backward reaction is zero

QUESTION 4. For a reaction where 2.00 mole of gaseous reactants is converted to 4.00 moles of gaseous products in an endothermic reaction, that uses a catalyst, which of the following will increase the amount of products in the equilibrium mixture?

(A) Increasing the temperature
(B) Increasing the pressure
(C) Decreasing the concentration of the reactants
(D) Using more of the catalyst
(E) Using a different catalyst

QUESTION 5. Dichromate (VI) ions (orange) can be converted to chromate (VI) ions (yellow) by adding water. The equilibrium below can be established. Which of the following is initially UNCHANGED by the addition of hydroxide ions to the equilibrium mixture?

Cr2O72-(aq) + H2O(l) <==> 2CrO42-(aq) + 2H+(aq)


(A) The color of the solution
(B) The concentration of H+ ions in solution
(C) The oxidation number of the chromium
(D) The position of equilibrium
(E) The concentration of dichromate (VI) ions in solution




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