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5 Written questions

5 Matching questions

  1. The reaction below has the following rate law: rate = 0.011 L/mol•s [SF4]2.
    SF4 → SF2 + F2

    How many minutes will it take for the concentration of SF4 to be reduced from 2.5 M to 0.25 M?
    a. 327 min
    b. 0.025 min
    c. 5.5 min
    d. 0.040 min
    e. 22.7 min
  2. Of the following questions, which ones are thermodynamic rather than kinetic concepts?
    I. Can substances react when they are put together?
    II. If a reaction occurs, how fast will it occur?
    III. What is the mechanism by which the reaction occurs?
    IV. If substances react, what energy changes are associated with the reaction?

    a. I and III
    b. II and IV
    c. I and IV
    d. II and III
    e. I, III, and IV
  3. The gas phase reaction A + B + C → D has a reaction rate which is experimentally observed to follow the relationship rate = k[A]2[C]. The reaction is ____ order in A, ____ order in B, and ____ order in C.
    a. first; second; third
    b. first; second; zero
    c. second; zero; first
    d. second; first; zero
    e. second; zero; zero
  4. A chemical reaction (below) is first order in A and has a rate constant of 1.2 × 10−3 min−1. If the initial concentration of A is 0.40 M., how much time must pass in order to reduce the concentration of A to 0.22 M?
    A → B + C

    a. 5.0 × 102 min
    b. 3.0 × 102 min
    c. 7.4 × 10−3 min
    d. 4.3 × 10−4 min
    e. 2.2 × 102 min
  5. If a reaction is second-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 2, the reaction rate will _____.
    a. increase by a factor of 4.
    b. remain constant.
    c. decrease by a factor of .
    d. increase by a factor of 2.
    e. decrease by a factor of .
  1. a a. increase by a factor of 4.
  2. b c. 5.5 min
  3. c a. 5.0 × 102 min
  4. d c. second; zero; first
  5. e c. I and IV

5 Multiple choice questions

  1. b. 7.5 M−2•s−1
  2. c. rate = k1[A]2
  3. a. rate = k
  4. b. 10.3 s
  5. e. 58.5 s

5 True/False questions

  1. The gas-phase reaction
    2NO + 2H2 → N2 + 2H2O
    has the following rate law expression, rate = 0.14 L2/mol2•s[NO]2[H2]. If the [NO] is 0.95 M and the [H2] is 0.45 M, what rate is expected?
    a. 0.060 mol/L•s
    b. 0.43 mol/L•s
    c. 0.027 mol/L•s
    d. 1.54 mol/L•s
    e. 0.057 mol/L•s
    e. 0.057 mol/L•s


  2. A plot of versus time is linear for the reaction D → E. What is the kinetic order of the reaction?
    a. second
    b. first
    c. zero
    d. one-half
    e. negative one
    a. second


  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.
    e. Reactions involving simultaneous trimolecular collisions are very common in gases.


  4. A hypothetical reaction X + 2Y → Products is found to be first order in X and second order in Y. What are the units of k, the specific rate constant, if reaction rate is expressed in units of moles per liter per second?
    a. M•s−1
    b. M−2•s−1
    c. M−3•s
    d. M2•s−1
    e. M−1•s
    b. M−2•s−1


  5. A bimolecular reaction is found to be 1st order with respect to both reactants. If the rate of reaction is 1.87 mol/L •s at 25°C, what is the reaction rate if both reactant concentrations are doubled?
    a. 7.48 mol/L•s
    b. 46.8 mol/L•s
    c. 1.87 mol/L•s
    d. 0.94 mol/L•s
    e. 3.74 mol/L•s
    a. increase by a factor of 4.