NAME

Question types


Start with


Question limit

of 124 available terms

Advertisement Upgrade to remove ads
Print test

5 Written questions

5 Matching questions

  1. The gas phase reaction A + B → C has a reaction rate which is experimentally observed to follow the relationship rate = k[A][B]2. The overall order of the reaction
    a. is first.
    b. is second.
    c. is third.
    d. is zero.
    e. cannot be determined.
  2. 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
  3. Which of the following is/are expected to affect the rate of a chemical reaction?
    1. Increasing the reaction temperature.
    2. Addition of a catalyst.
    3. Stirring a well mixed reaction solution.



    a. 1 only
    b. 2 only
    c. 3 only
    d. 1 and 2
    e. 1, 2, and 3
  4. #126 go to graph
  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 b. second order in B and second order overall
  2. b d. 1 and 2
  3. c go to graph
  4. d e. 8.5 min
  5. e c. is third.

5 Multiple choice questions

  1. a. zero order graph
  2. e. a greater fraction of molecules possess the activation energy when they collide
  3. e. k[A][B]2
  4. b. 2.25 x 10-2 Ms-1
  5. e. Endothermic Reaction / reaction having Ea, reverse > Ea, forward

5 True/False questions

  1. Evaluate the specific rate constant at the temperature at which the data were collected. The rate-law expression is rate = k[NO]2[H2].
    H2(g) + NO(g) → N2O(g) + H2O(g)

    Experiment Initial [NO] (M) Initial [H2] (M) Initial Rate (M•s−1)
    1 0.30 0.35 2.835 × 10−3
    2 0.60 0.35 1.134 × 10−2
    3 0.60 0.70 2.268 × 10−2



    a. 9.4 × 10−3 M−2•s−1
    b. 2.7 × 10−2 M−2•s−1
    c. 1.6 × 10−4 M−2•s−1
    d. 8.1 × 10−3 M−2•s−1
    e. 9.0 × 10−2 M−2•s−1
    d. k[B]2[C]

          

  2. Consider the reaction below and its observed rate law expression. Which proposed mechanisms are consistent with the rate law expression?
    2NO2 → 2NO + O2 rate = k[NO2]2

    I. NO2 + NO2 → N2O4 slow
    N2O4 → N2 + 2O2 fast
    N2 + O2 → 2NO fast
    2NO2 → 2NO + O2 overall

    II. NO2 → N + O2 slow
    NO2 + N → N2O2 fast
    N2O2 → 2NO fast
    2NO2 → 2NO + O2 overall

    III. NO2 → NO + O slow
    O + NO2 → NO + O2 fast
    2NO2 → 2NO + O2 overall

    a. I
    b. II
    c. III
    d. I and III
    e. another combination
    d. 2.4 × 10−5 M

          

  3. 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
    c. 0.266 s−1

          

  4. Which of the following is a kinetic quantity?
    a. enthalpy
    b. internal energy
    c. free energy
    d. rate of reaction
    e. entropy
    d. In reactions that are second order in one reactant and first order in another, the slow step generally involves a three-body collision of these reactants.

          

  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 .
    a. increase by a factor of 4.

          

Create Set