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Unformatted text preview: Review Problems for Exam 2 – Part 1 (with selected answers) 09-106 Spring 2011 1 I. For the following statements, circle T if the statement is TRUE and F if it is FALSE . . T F 1. For the equilibrium H 2 (g) + Cl 2 (g) barb2leftbarb2right 2HCl(aq), increasing the total pressure of the container will not affect the equilibrium position. T F 2. In the following exothermic reaction: NaOH(s) + CO 2 (g) barb2leftbarb2right NaHCO 3 (s), lowering the temperature will decrease the equilibrium concentration of CO 2 (g). T F 3. Unless Δ H°=0, a change in temperature will affect the value of K . T F 4. When the concentration of a reactant increases in the rate law of a reaction, the rate always increases. T F 5. The half-life of a first order reaction does not depend on the initial concentration of reactant. T F 6. For an equilibrium with a very large K, the rate constant of the forward reaction is larger than that of the reverse reaction. T F 7. If Q < K at a given temperature, a reaction proceeds toward reactants in order to re-establish equilibrium. T F 8. For the reaction H 2 CO 3 (aq) + NH 3 (aq) barb2leftbarb2right NH 4 + (aq) + OH- (aq) + CO 2 (g), each species would contribute to the K expression in concentration units. II. Circle the letter of the best response for each of the following. 1. In order to write the correct equilibrium constant expression for a reaction, one must a. have a properly balanced chemical equation b. have values for the concentrations of the reactants and products c. both a and b d. know the kinetic rate law for the reaction e. know the mechanism for the reaction 2. Identify the INCORRECT statement below regarding chemical equilibrium: a) All chemical reactions are, in principle, reversible. b) Equilibrium is achieved when the forward reaction rate equals the reverse reaction rate. c) Equilibrium is achieved when the concentration of species become constant. d) Equilibrium is achieved when the reaction quotient Q equals the equilibrium constant. e) Equilibrium is achieved when the reactant and product concentrations become equal. Review Problems for Exam 2 – Part 1 (with selected answers) 09-106 Spring 2011 2 3. If the equilibrium constant for the reaction: 2 CO(g) + O 2 (g) barb2leftbarb2right 2 CO 2 (g) is K , what is the equilibrium constant, K ’, for CO 2 (g) barb2leftbarb2right CO(g) + ½ O 2 (g)? (a) K’ = ( K )-1/2 (b) K’ = ½ ( K ) (c) K’ = K 1/2 (d) K = ( K ’ )-1/2 4. In the synthesis of ammonia, N 2 ( g ) + 3H 2 ( g ) barb2right 2NH 3 ( g ), what happens to G and Q if the partial pressure of NH 3 is increased at a constant temperature?...
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