1. As always… Lon-Capa assignments Lecture videos Textbook Read
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2. Exam III Thursday, December 7, 7:00-9:00 pm; rooms are on the website.
Conflict: (12/7) 4:30-6:30 pm in 101 Transportation; sign up in 1026 Chem Annex
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Review sessions:
To be announced

3. Rate Laws From Elementary Steps

4. Clicker Question
The reaction 2A + B  C has the following proposed mechanism
A + B D (fast equil.)
D + B  E (slow)
E + A  C + B (fast)
The rate law from this mechanism is
a) rate = k[A][B] d) rate = k[A][B]2
b) rate = k[A]2[B] e) I don’t know
c) rate = k[A]2[B]2

5. Clicker Question
The experimental rate law for the decomposition of nitrous oxide (N2O) to N2 and O2 is rate = k[N2O]2. Two mechanisms are proposed:
I. N2O  N2 + O
N2O + O  N2 + O2
II. 2N2O N4O2
N4O2  2N2 + O2
Which of the following could be a correct mechanism?
a) Mechanism I with the first step as the rate-determining step.
b) Mechanism I with the second step as the rate-determining step as long as the first step is a fast equilibrium step.
c) Mechanism II with the second step as the rate-determining step if the first step is a fast equilibrium step.
d) None of the choices (a-c) could be correct.
e) At least two of the above choices (a-c) could be correct.

6. Pseudo-Order Question
Determine the rate law and value of k given the following data.
2H2(g) + 2NO(g)  N2(g) + 2H2O(g)
EXPERIMENT #1 EXPERIMENT #2
TIME (sec) [NO] [NO] ________
x 10-2 M 1.00 x 10-2 M
x 10-3M 5.00 x 10-3 M
x 10-3 M 3.33 x 10-3 M
x 10-3 M 2.50 x 10-3 M
x 10-3 M 2.00 x 10-3 M
In experiment #1, [H2]0 = 10.0 M
In experiment #2, [H2]0 = 20.0 M