CHEM 4501 Study Guide - Summer 2018, Comprehensive Midterm Notes - Potassium, Oxygen, Venture Capital
CHEM 4501
MIDTERM EXAM
STUDY GUIDE
Fall 2018
1. Elementary Reactions – No intermediates involved
a. Unimolecular A k
⇒ P V = k1 [A]
b. Bimolecular A + B k
⇒ P V = k2 [A][B] More typical
A + A → P V = k2 [A]2 (not unimolecular)
c. Termolecular A + B + C → P V = k [A][B][C] More rare
2. Detailed Balance
Forward
V1 = k1 [A][B]
Reverse V1 = V-1
V-1 = k-1 [C] k1 [A][B] = k-1 [C]
kc = k
k−
= []
[][]
Microscopic reversibility
E
A + B
AB*
C
AB
k k
ۛ
ۛ
ۛ
C
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[I] =
[P] = [A]0
k2 >> k1
3. Steady State Approximation
2NO(g) + O2 (g) = 2NO2 (g)
In 2 elementary steps:
NO (g) + NO (g)
N2O2 (g) (1)
N2O2 (g) + O2 (g) → 2NO2 (g) (2)
Rate Law: V = kobs [NO]2[O] exp.
V =
= k1 [NO]2 – k-1 [N2O2]
= k2 [N2O2] [O2]
0
= 0 = k1 [NO]2 – k2 [N2O2][O2] – k1[N2O2]
= 0 → Steady state
[N2O2] =
V = k2 [N2O2] [O2] =
[NO]2 [O2]
kobs
k1 >> k2 [O2]
[N2O2] Relatively low
t
[NO2]
[NO]
[A]
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