Collision Theory & Factors Affecting Reaction Rate

1. Collision Theory & Factors Affecting Reaction Rate

2. Kinetic Molecular Theory • The Kinetic Molecular Theory states that: • All particles are in constant motion • Collisions are happening between • Other particles • Walls of the container

3. Collision Theory • Not all collisions lead to a reaction, in fact most collisions do not lead to a reaction • For a reaction to occur, there must be an effective collision between reactants • Correct orientation of molecules • Sufficient energy Rate = collision frequency X fraction effective

4. Correct Orientation

5. Correct Orientation

6. Sufficient Energy • In most reactions, only a small fraction of the total collisions have sufficient energy to overcome the activation energy (EA) of a reaction • Activation energy: • the minimum collision energy required for a reaction to occur • depends on the kinetic energy of the colliding particles

7. Maxwell Boltzman Distribution

8. Potential Energy Diagrams

9. Consolidate • Read p. 383-387 • P. 387 #1 • Worksheet: Potential energy diagram & factors that affect reaction rate