Collision Theory

1
Collision Theory
2
Reaction Coordinate Diagrams
3
Multistep Reactions
4
Arrhenius Equation Temperature and Ea Dependence
5
Example 1. Use the data below to find Ea.
6
Example 2. A reaction has Ea 75 kJ/mol. If k
1.50 x 10-3 at 25 oC, what is k at 50 oC?
7
Example 3. A reaction doubles its rate when the
temperature increases
from 25 oC to 35 oC. What is the activation
energy?
8
Reaction Mechanisms The pathway by which a
reaction proceeds from reactants to products.

• Each discrete chemical event is an elementary
  step.
• The reaction is a series of elementary steps.
• Steps are usually unimolecular or bimolecular.
• The overall reaction is the sum of the steps.
• Each elementary step goes at its own rate.
• The rate of the overall reaction is the rate of
  the slowest (rate determining) step.

9
(No Transcript)
10
Rate Laws for Elementary Steps
11
Overall Reaction Intermediates Catalysts
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)