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:
Monday, December 4: 7-9 pm 165 Noyes Lab
Tuesday, December 5: 7-9 pm 165 Noyes Lab

4. 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

5. Pseudo-Order Question (con’t)
A H2 + NO  H2O + N (slow)
N + NO  N2 + O (fast)
O + H2  H2O (fast)
B H2 + 2NO  N2O + H2O (slow)
N2O + H2  N2 + H2O (fast)
C 2NO N2O2 (fast equil.)
N2O2 + H2  N2O + H2O (slow)
D Two of the above are equally good.

6. Clicker Question
Consider the reaction 2A  C which has the following proposed mechanism:
1. A B
2. A + B  C
Defining rate = d[C]/dt , use the steady-state approximation to determine the rate law for the mechanism and choose the correct statement below. (Note: nothing is implied about the order in B in the responses below).
a) The rate law appears first order in A at very low [A], and second order in A at very high [A].
b) The rate law appears first order in A at very high [A], and second order in A at very low [A].
c) The reaction appears first order in A at very high and very low [A].
d) The rate law appears second order in A at very high and very low [A].
e) The rate law is zero order in A.

7. Clicker Question
Consider the activated complex demonstration. Suppose we run two trials, one at 55C and one at 65C. The times for the reaction are 85 seconds and 41 seconds, respectively. Determine the activation energy for this reaction. Assume the frequency factor, A, to be constant.
a) 261 J/mol
b) 663 J/mol
c) kJ/mol
d) kJ/mol
e) kJ/mol