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5 Written questions

5 Matching questions

  1. A plot of ln [C] versus time is linear for the reaction C → D. What is the kinetic order of the reaction?
    a. second
    b. first
    c. zero
    d. one-half
    e. negative one
  2. The rate constant for a first-order reaction is 0.58 s−1 at 25°C. At what temperature would the rate constant have a value of 0.75 s−1? The activation energy is 84 kJ/mol and the universal gas constant = 8.314 J/mol•K.


    a. 30°C
    b. 300°K
    c. 298 K
    d. 301 K
    e. 310 K
  3. Consider a chemical reaction involving compounds A and B, which is found to be first order in A and second order in B. At what rate will the reaction occur in experiment 2?

    Experiment Rate (M•s−1) Initial [A] Initial [B]
    1 0.10 1.0 M 0.20 M
    2 ? 2.0 M 0.60 M

    a. 1.2 M•s−1
    b. 0.20 M•s−1
    c. 0.60 M•s−1
    d. 1.8 M•s−1
    e. 0.36 M•s−1
  4. 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
  5. Which of the following statements concerning graphical methods for determining reaction order is false?
    a. For a first-order reaction the plot of ln[A] vs. time gives a straight line.
    b. For a first-order reaction the slope of the straight-line graph equals −ak.
    c. For a second-order reaction the plot of [A]2 vs. time gives a straight line.
    d. For a first-order reaction the intercept of the straight-line graph equals ln [A]0.
    e. For a zero-order reaction the plot of [A] vs. time gives a straight line.
  1. a b. first
  2. b c. 0.24 M
  3. c c. For a second-order reaction the plot of [A]2 vs. time gives a straight line.
  4. d b. 300°K
  5. e d. 1.8 M•s−1

5 Multiple choice questions

  1. b. The rate is reduced by 3/4.
  2. b. 0.00648 M
  3. c. an equation in which reaction rate is equal to a mathematical expression involving, or related to, concentrations of reactants involved in the rate-determining step
  4. d. 2SO2(g) + O2(g) → 2SO3(g)
  5. a. 1.87 × 104 s−1

5 True/False questions

  1. For a certain third-order reaction with the general form aA → products, the rate is 0.36 M·s−1 when the concentration of the reactant is 0.35 mol/L. What is the rate constant for this reaction?

    a. 0.042 M−2⋅s−1
    b. 8.4 M−2⋅s−1
    c. 0.36 M−2⋅s−1
    d. 0.34 M−2⋅s−1
    e. 24 M−2⋅s−1
    e. 48 kJ/mol

          

  2. The reaction, A + 2B → B2 + A, proceeds by the following mechanism: (A is a catalyst.)
    A + B → AB (slow)
    AB + B → B2 + A (fast)

    What is the rate law expression for this reaction?
    a. Rate = k[A]
    b. Rate = k[B]
    c. Rate = k[A][B]
    d. Rate = k[A][B]2
    e. Rate = k[A]2[B]
    a. M−1•min−1

          

  3. At 300 K the reaction below obeys the rate law Rate = k[NOCl]2 where k = 2.8 × 10−5 M−1•s−1.
    2NOCl → 2NO + Cl2

    Suppose 1.0 mole of NOCl is introduced into a 2.0-liter container at 300 K. Evaluate the half-life of the reaction.
    a. 2.6 × 103 seconds
    b. 3.6 × 104 seconds
    c. 2.4 × 104 seconds
    d. 1.1 × 103 seconds
    e. 4.0 × 104 seconds
    b. 3.6 × 104 seconds

          

  4. A reaction mechanism will usually be
    a. the only possible explanation for the reaction.
    b. difficult to verify experimentally.
    c. generally obvious from the balanced chemical equation.
    d. obvious from a consideration of the balanced chemical equation.
    e. obvious from a consideration of the reaction rate data.
    a. M−1•min−1

          

  5. 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
    c. I and IV

          

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