1. Collision Theory and Reaction Rate
Notes

2. Rates of Chemical Reactions
The amount of time it takes for a chemical reaction to come to completion is called the reaction rate
Reaction rates are different for different reactions
They can range from a fraction of a second to days or even years

3. Why do different reactions have different rates?
The rates of reaction are related to the properties of particles through a model called collision theory
Particles will only react if there is an effective or successful collision between them

4. In order for particles to react,
They must collide

5. 2. They must collide in the correct orientation to form the activated complex

6. The activated complex is a temporary, unstable arrangement of atoms that may lead to products
It can be thought of as a transition state between reactants and products

7. 3. They must collide with a specific minimum amount of energy (activation energy) to form the activated complex

8. Collision theory and rate of reaction
The rate of a reaction can be increased by changing certain factors in a reaction like temperature or concentration of reactants
These factors will increase the reaction rate if they produce a greater number of effective collisions

9. A greater number of effective collisions can be achieved by anything that
Increases the energy of the reactants
Lowers the activation energy
Produces more collisions per unit of time