Chem Midterm # 1

Card Set Information

Author:
jess3c
ID:
16628
Filename:
Chem Midterm # 1
Updated:
2010-04-28 13:30:43
Tags:
Chem Midterm
Folders:

Description:
Midterm #1
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user jess3c on FreezingBlue Flashcards. What would you like to do?


  1. A reaction is found to have an activation energy of 108 kJ/mol. If the rate constant for this reaction is 4.60 x 10-6 s-1 at 275 K, what is the rate constant at 366 K?

    A) 1.85 x 10-4 s-1
    B) 0.580 s-1
    C) 5.40 x 10-5 s-1
    D) 1.72 s-1
    E) 11.7 s-1
    B) 0.580 s-1
    (this multiple choice question has been scrambled)
  2. Which of the following statements is FALSE?
    A) The average rate of a reaction decreases during a reaction.
    B) The half life of a first order reaction is dependent on the initial concentration of reactant.
    C) It is not possible to determine the rate of a reaction from its balanced equation.
    D) None of the statements is false.
    E) Zero order reactions are not dependent on concentration.

    Note if you chose “a”, that is acceptable since in the case of zero order reaction that statement is false,
    and it does not specify the reaction order.
    B) Teh half life of a first order reaction is dependent on the intial concentration of reactant.
    (this multiple choice question has been scrambled)
  3. Which of the following reactions would you predict to have the smallest orientation factor?
    A) X2 + Y2 >> 2 XY
    B) N + O2 >> NO2
    C) NOCl2 + NO >> 2 NOCl
    D) All of these reactions should have nearly identical orientation factors.
    E) N2 + O2 >> 2 NO
    C) NOCl2 + NO >> 2 NOCl
    (this multiple choice question has been scrambled)
  4. What is the overall order of the following reaction, given the rate law?
    2 X + 3 Y >> 2 Z Rate =k[X]1[Y]2
    a) 3rd order
    b) 5th order
    c) 2nd order
    d) 1st order
    e) 0th order
    a) 3rd order
  5. Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular
    temperature. Determine the equilibrium
    concentration of H2O(g).
    C2H4(g) + H2O(g) ↔ C2H5OH(g) Kc = 9.0 x 103
    [C2H4]eq = 0.015 M [C2H5OH]eq = 1.69 M
    A) 1.0 M
    B) 9.9 x 10-7 M
    C) 0.013 M
    D) 1.68 M
    E) 80. M
    C) 0.013 M
    (this multiple choice question has been scrambled)
  6. What are the units of k in the following rate law?
    Rate = k[X]2[Y]
    a) 1 Ms2
    b) 1 M2s
    c) M2s
    d) M2s
    e) 1 M3s
    • b) 1 M2s
  7. The first-order decomposition of cyclopropane has a rate constant of 6.7 x 10-4 s-1. If the initial
    concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s?
    A) 0.43 M
    B) 0.15 M
    C) 0.94 M
    D) 0.86 M
    E) 0.67 M
    D) 0.86
    (this multiple choice question has been scrambled)
  8. The first-order rearrangement of CH3NC is measured to have a rate constant of 3.61 x 10-15 s-1 at 298 K and a rate constant of 8.66 x 10-7 s-1 at 425 K. Determine the activation energy for this reaction.
    A) 240. kJ/mol
    B) 160. kJ/mol
    C) 338 kJ/mol
    D) 417 kJ/mol
    E) 127 kJ/mol
    B) 160. kJ/mol
    (this multiple choice question has been scrambled)
  9. Write a balanced chemical equation that corresponds to the following equilibrium constant expression.
    K = [F-][H3O+]
    [HF]
    A) HF(aq) ↔ F-(aq) + H3O+(aq)
    B) F-(aq) + H3O+(aq) ↔ HF(aq)
    C) H+(aq) + OH-(aq) ↔ H2O(l)
    D) F-(aq) + H3O+(aq) ↔ HF(aq) + H2O(l)
    E) HF(aq) + H2O(l) ↔ F-(aq) + H3O+(aq)
    E) HF(aq) + H2O(l) ↔ F-(aq) + H3O+(aq)
    (this multiple choice question has been scrambled)
  10. Given the following rate law, how does the rate of reaction change if the concentration of Y is doubled?
    Rate = k[X][Y]2
    A) The rate of reaction will decrease by a factor of 2.
    B) The rate of reaction will remain unchanged.
    C) The rate of reaction will increase by a factor of 2.
    D) The rate of the reaction will increase by a factor of 4.
    E) The rate of reaction will increase by a factor of 5.
    D) The rate of the reaction will increase by a factor of 4.
    (this multiple choice question has been scrambled)

What would you like to do?

Home > Flashcards > Print Preview