a). rate = k[F2][ClO2]2 b). rate = k[F2][ClO2] c). rate = k[FClO2]2CH 117 Summer 2015 Mock Exam 1 d). rate = k[F2][ClO2][FClO2] 7. If the experimental data for the data above were plotted with 1/[F2] on the yaxis and time on the xaxis, what would the slope of the straight line be equal to? a). 1 b). the negative of the rate constant c). the rate constant d). one over the rate constant 8. What is the rate constant for a firstorder chemical reaction, if the reaction has a halflife equal to 85 minutes? a). 8.15 x 103 s1 b). 1.36 x 104 s1 c). 582.9 s1 d). 3534.3 s1 9. The reaction SO2Cl2 → SO2 + Cl2 has a rate constant of 0.17 hours1. If the initial concentration of SO2Cl2 is 1.25 x 103 M, how many seconds does it take for the concentration to drop to 3.1 x 104 M? a). 8.20 s b). 2.9 x 104 s c). 643 min d). 7.5 x 103 s 10. The rate constant for a firstorder reaction at 473 K is 7.43 x 103 s1 and is 9.82 x 102 s1 at 873 K. What is the activation energy of this reaction? a). 857 kJ b). 0.04503 kJ c). 22,220 kJ d). 22.2 kJ 11. A mixture of 2.0 mol of CO (g) and 2.0 mol of H2O (g) was allowed to come to equilibrium in a 1 L flask at a high temperature. If Kc = 4.0, what is the molar concentration of H2 (g) in the equilibrium mixture? CO (g) + H2O (g) → CO2 (g) + H2 (g) a). 0.67 b). 0.05 c). 1.27 d). 1.0 12. A 1.20 L flask contains an equilibrium mixture of 0.0168 mol of N2, 0.2064 mol of H2, and 0.0143 mol of NH3. Calculate the equilibrium constant Kc for the reaction.CH 117 Summer 2015 Mock Exam 1 N2 (g) + 3H2 (g) → 2NH3 (g) a). 1.38 b). 1.99 c). 4.96 d). 4.12 13. Consider the equilibrium N2 (g) + O2 (g) → 2NO (g). At 2300 K the equilibrium constant Kc = 1.7*103. Suppose that 0.015 mol NO, 0.25 N2, and 0.25 mol O2 are placed in a 10 L flask, sealed, and heated to 2300 K. Is this reaction initially at equilibrium? a). Yes, no shift will occur. b). No, the reaction must shift towards the products to reach equilibrium. c). No, the reaction must shift towards the reactants to reach equilibrium. d). Not enough information to answer this question. 14. Which of the following best describes the role of a catalyst? a). A catalyst will affect a reaction by lowering the activation energy and shifting an equilibrium towards the products. b). A catalyst will affect a reaction by lowering the activation energy and shortens the time it takes for a reaction to reach equilibrium. c). A catalyst will affect a reaction by lowering the activation energy and have no effect on the equilibrium. d). A catalyst will not affect a chemical reaction. 15. Given that Kc = 1285 for the reaction NO2 → NO + 1/2O2, what is the value of Kc for this reaction: 2 NO + O2 → 2 NO2? a). 6.1 x 107 b). 2570 c). 1.6 x 106 d). Not enough information given to answer this question. Short Answer 16. Consider the reaction: PCl5 (g) → PCl3 (g) + Cl2 (g), with an enthalpy of +20.6 kJ. Predict which direction the reaction will shift under each of the following conditions, using Le Chatelier’s Principle. a. Add PCl5 b. Add Cl2 c. Remove PCl3 d. Increase the volume of the reaction flask 17. Answer the following question about the mechanism below. Step 1: NO + O2 → NO3 (fast, in equilibrium) Step 2: NO3 + NO → 2 NO2 (slow)CH 117 Summer 2015 Mock Exam 1 a. What is the overall reaction? b. List any intermediates. c. What is the rate law for the overall reaction?
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