1. Collision Theory

2. Reactions are fastest with… 1.Large Ea, Large T 2.Low Ea, Large T 3.Large Ea, Low T 4.Low Ea, Low T

3. Reaction Coordinate Diagrams

4. Multistep Reactions

5. Arrhenius Equation: Temperature and E a Dependence

6. Example 1. Use the data below to find Ea.

7. Example 2. A reaction has Ea = 75 kJ/mol. If k = 1.50 x 10 -3 at 25 o C, what is k at 50 o C?

8. Example 3. A reaction doubles its rate when the temperature increases from 25 o C to 35 o C. What is the activation energy?

9. 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.

10. Catalysts and Intermediates

12. Rate Laws for Elementary Steps

13. SN1 reaction: not in rate law? 1.1 2.2 3.3 4.4

14. Overall Reaction: Intermediates: Catalysts:

16. What is I - ? 1.Reactant 2.Product 3.Catalyst 4.Intermediate

19. What is ClO? 1.Reactant 2.Product 3.Catalyst 4.Intermediate