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5 Written questions

5 Matching questions

  1. In the following reaction, = −0.89 mol/L•s. What is the value of the rate of the reaction at this time?
    A + 3B → AB3

    a. 0.30 mol/L•s
    b. 0.89 mol/L•s
    c. −0.30 mol/L•s
    d. 2.67 mol/L•s
    e. 0.22 mol/L•s
  2. The rate constant for the second order reaction below is 2.79 L/mol •min at 48°C. If the initial concentration of NO2 is 1.05 M , what is the half-life?
    2NO2 → N2O4

    a. 20.5 s
    b. 10.3 s
    c. 0.341 min
    d. 176 s
    e. 14.9 s
  3. Which of the following statements about reaction mechanisms is false?
    a. A reaction can have more than one possible mechanism.
    b. A reaction mechanism must be consistent with the experimentally observed rate law.
    c. The slowest step in the reaction mechanism is called the rate-determining step.
    d. Reaction mechanisms involve complex reaction steps.
    e. Reaction mechanisms are difficult to prove.
  4. Calculate the activation energy of a reaction if its rate constant is 2.8 × 106 s−1 at 24°C and 1.5 × 107 s−1 at 48°C.
    a. 26 kJ/mol
    b. 80. kJ/mol
    c. 55 kJ/mol
    d. 67 J/mol
    e. 3.51 J/mol
  5. The oxidation of NO by O3 is first order in each of the reactants, and its rate constant is 1.5 × 107 M−1•s−1. If the concentrations of NO and O3 are each 5.0 × 10−7 M, what is the rate of oxidation of NO in M•s−1?
    a. 3.8 × 10−6
    b. 2.5 × 10−14
    c. 7.5 × 10−7
    d. 15
    e. 7.5
  1. a d. Reaction mechanisms involve complex reaction steps.
  2. b a. 0.30 mol/L•s
  3. c c. 55 kJ/mol
  4. d a. 3.8 × 10−6
  5. e b. 10.3 s

5 Multiple choice questions

  1. d. 18
  2. a. decrease by 3/4
  3. e. 6.4 × 10−3 M•s−1
  4. a. 21 min
  5. c. is third.

5 True/False questions

  1. The rate constant for a first-order reaction is 1.4 × 10-2 s-1 at 716 K and 5.5 × 10-2 s-1 at 864 K. What is the activation energy?
    a. 27 kJ/mol
    b. 21 kJ/mol
    c. 47 kJ/mol
    d. 5700 kJ/mol
    e. 48 kJ/mol
    a. 1.87 × 104 s−1

          

  2. Which of the following statements about catalysts are false?
    a. A catalyst lowers the activation energy.
    b. A catalyst can make a nonspontaneous reaction spontaneous.
    c. A catalyst speeds up both the forward and reverse reaction.
    d. A catalyst speeds up the rate of reaction.
    e. Catalyst are often transition metals and transition metal oxides.
    d. Reaction mechanisms involve complex reaction steps.

          

  3. Which term is incorrectly matched with its description?
    a. Activation Energy / kinetic energy required for reaction to occur
    b. Transition State / short-lived high-energy intermediate state
    c. Effective Collision / molecular collision resulting in a reaction
    d. Net energy change of the reaction / Ea, forward − Ea, reverse
    e. Endothermic Reaction / reaction having Ea, reverse > Ea, forward
    e. The Grand Canyon was created by dissolution by water over millions of years.

          

  4. Cyclopropane rearranges to form propene in a reaction that is first order. If the rate constant is 2.74 × 10−3 s−1, how long would it take for 85.6% of the cyclopropane to rearrange if the initial concentration was 0.460 M?
    a. 51.0 s
    b. 62.0 s
    c. 707 s
    d. 2.74 × 10−3 s
    e. 3.83 × 10−4 s
    d. 0.491

          

  5. The gas phase reaction below obeys the rate-law expression rate = k[SO2Cl2]. At 593 K the specific rate constant is 2.2 × 10−5 s−1. A 2.0-g sample of SO2Cl2 is introduced into a closed 4.0-L container.
    SO2Cl2 → SO2 + Cl2

    How much time must pass in order to reduce the amount of SO2Cl2 present to 1.8 grams?
    a. 7.4 × 103 seconds
    b. 2.1 × 102 seconds
    c. 3.5 × 102 seconds
    d. 4.8 × 103 seconds
    e. 5.8 × 104 seconds
    b. 3.6 × 104 seconds