Fact 1: All chemical reactions require activation energy to get started.

Fact 2: Chemical changes are a result of chemical reactions.

Given the two facts above, answer the question "What is required before a chemical change?" with the following options: 
- kinetic energy
 - energy usage
 - activation push
 - activation energy
 - activation switch
 - activation power
 - Burning fuel and air
 - Evaporation


 

    activation energy     