CHM 115 CHM115 Practice Chapter 12 Quiz Answers (Grand Canyon University)

CHM 115 CHM115 Practice Chapter 12 Quiz Answers (Grand Canyon University)


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CHM 115 Practice Chapter 12 Quiz Answers (Grand Canyon University)

  1. Which relationship of reaction rates is correct for the following reaction?
  2. Given the following equation Br2(g) + 3F2(g) ---> 2BrF3(g), if -Δ[F2]/Δtime = 2.4 x 10-4 M/s, then what is the value of Δ[BrF3]/Δtime? 

  3. In which rate law is the overall reaction order equal to 3?

  4. Which statement is NOT true for the reaction C + D à F + G if the rate law is
    rate = k[C]

  5. Which statement is true regarding the experimental determination of a rate law?

  6. Given the following reaction:  2 H2 (g) + 2 NO (g) à 2 H2O + N2 (g)  Use the following initial rate data to determine the rate law.

  7. The reaction CO (g) + Cl2 (g) ---> COCl2 (g) is first order with respect to CO, and 3/2 order with respect to Cl2. If the units for rate are M/min, what are the units of the rate constant for this reaction?

  8. The reaction D à Products is first order, and the rate constant is 2.7 x 10-4 s-1. If the initial concentration of D is 3.00 M, then what is the final concentration of D after 2.50 hr?

  9. Circle the graph that best describes the following reaction if it is zero order in N2O4?

  10. Which statement is true about the half-life of a first-order reaction?

  11. Which mechanism is consistent with the rate law rate = k[A][B] for the reaction A + 2B à 2C?

  12. If a reaction has an activation energy of 125 kJ/mole and an energy of reaction of +35 kJ/mole, then which of these energy combinations represents the use of a catalyst in this reaction?

  13. If the rate constant of a reaction increases by a factor 2.5 when the temperature is increased from 22 °C to 35 °C, then what is the activation energy (in kJ/mole) of the reaction?

  14. If a reaction is first order with a rate constant of 5.48 x 10-2 sec-1, how long is required for 3/4 of the initial concentration of reactant to be used up?

  15. For the following reaction:

  16. A reaction is first order. If the initial reactant concentration is 0.0200 M, and 25.0 days later the concentration is 6.25 x 10-4 M, then its half-life is:

  17. The rate constant at 160oC for the first order decomposition of ore is 0.032/min. The half-life of the reaction is:

  18. In a typical energy profile diagram, the transition state:

  19. Potassium Chlorate, KClO3, decomposes according to the reaction:

    2KClO3 → 2KCl + 3O2

    If the rate of decomposition of KClO3 at a certain time is determined to be 2.4 x 10-2 mol s-1, what is the rate of formation of KCl at the same time?

  20. The rate law for a reaction involving only A and B is 1st order in A and 4th order in B, respectively.  If the concentration of A is increased by a factor of 4 and the concentration of B is tripled the new rate will be:

  21. Nitric oxide gas reacts with chlorine gas according to the equation:

    2 NO + Cl2à 2 NOCl

  22. What is the numerical value of the rate constant?

  23. Determine the initial rate of B consumption ([B]/t) in the first trial?

  24. For a first order reaction with a rate constant k = 3.13 x 102 s-1, how long does it take for the concentration of the only reactant to become 40% of the original amount?

  25. Given the following reaction:  

    2 H2 (g) + 2 NO (g) à 2 H2O + N2 (g)  

  26. For the reaction:

    2NO(g) + Cl2(g) ßà 2NOCl(g)  

    a mechanism involving the following steps has been proposed:

  27. The rate constants are given below for the following reaction, at two different temperatures:

  28. The following reaction is first order in [H2O2]:


    2H2O2 (l) → 2H2O (l) + O2 (g)

  29. Which letter shows the activation energy (without use of a catalyst)?

  30. Which letter shows the change in energy for the overall reaction?

  31. Which letter shows the activation energy using a catalyst?

  32. Catalysts lower the activation energy of a reaction by:

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