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5 Written questions

5 Matching questions

  1. Compounds A and B react to form C and D in a reaction that is found to be second-order overall and second-order in B. The rate constant at 30°C is 0.622 liter per mole per minute.
    A + B → C + D

    How many minutes does it take 4.0 × 10−2 M B (mixed with excess A) to be reduced to 3.3 × 10−2 M B?
    a. 1.4 min
    b. 3.6 min
    c. 5.0 min
    d. 6.4 min
    e. 8.5 min
  2. Which of the following reactions would be expected to be the slowest?
    a. Ag+(aq) + Cl−(aq) → AgCl(s)
    b. H+(aq) + OH−(aq) → H2O
    c. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
    d. Pb2+(aq) + CrO42−(aq) → PbCrO4(s)
    e. H+(aq) + CN−(aq) → HCN(aq)
  3. The decomposition of dinitrogen pentoxide obeys the rate-law expression rate = 0.080 min−1[N2O5]. If the initial concentration of N2O5 is 0.30 M, what is the concentration after 2.6 minutes?
    N2O5 → N2O3 + O2

    a. 0.38 M
    b. 0.028 M
    c. 0.24 M
    d. 0.13 M
    e. 0.32 M
  4. The specific rate constant, k, for a reaction is 0.44 s−1 at 298 K, and the activation energy is 245.kJ/mol. Calculate k at 398 K. (The universal gas constant = 8.314 J/mol•K.)


    a. 2.71 × 1010 s−1
    b. 6.17 × 1010 s−1
    c. 1.03 × 1010 s−1
    d. 8.32 × 108 s−1
    e. 4.51 × 109 s−1
  5. Consider the hypothetical reaction shown below.
    A + 2B → AB2

    Assume that the following proposed mechanism is consistent with the rate data.

    B + B → B2 slow
    B2 + A → AB + B fast
    B + AB → AB2 fast
    A + 2B → AB2 overall

    Which one of the following statements must be true? The reaction is ____.
    a. first order in A, second order in B, and third order overall
    b. second order in B and second order overall
    c. first order in A and first order overall
    d. second order in B, zero order in A, and third order overall
    e. second order in A and second order overall
  1. a e. 8.5 min
  2. b a. 2.71 × 1010 s−1
  3. c c. 0.24 M
  4. d b. second order in B and second order overall
  5. e c. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

5 Multiple choice questions

  1. go to graph
  2. b. The rate is reduced by 3/4.
  3. a. decrease by 3/4
  4. b. 54.5 s−1
  5. c. Each enzyme catalyzes many different reactions in a living system.

5 True/False questions

  1. The following data were collected for the following reaction at a particular temperature. What is the rate-law expression for this reaction? rate = ____.
    A + B → C

    Experiment Initial [A] Initial [B] Initial Rate of Formation of C
    1 0.10 M 0.10 M 4.0 × 10−4 M/min
    2 0.20 M 0.20 M 3.2 × 10−3 M/min
    3 0.10 M 0.20 M 1.6 × 10−3 M/min

    a. k[A]
    b. k[A]2
    c. k[A][B]
    d. k[B]
    e. k[A][B]2
    d. k[H2][CO]

          

  2. What would be the activation energy of a reaction if its rate constant at 35°C was double the value of its rate constant at 25°C?
    a. 63.8 kJ/mol
    b. 75.1 kJ/mol
    c. 8.12 kJ/mol
    d. 52.9 kJ/mol
    e. 68.3 J/mol
    d. 47.1 kJ/mol

          

  3. 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

          

  4. 124 go to graphgraph

          

  5. One of the reactions that is used to produce gaseous hydrogen commercially follows. A proper expression for the rate of this reaction could be ____.
    H2O(g) + CO(g) → H2(g) + CO2(g)

    a.
    b.
    c. k
    d.
    e.
    c. is third.