You are presented with the question "What is required before a chemical change?" and the following answer choices: 
- kinetic energy
 - energy usage
 - activation push
 - activation energy
 - activation switch
 - activation power
 - Burning fuel and air
 - Evaporation

Now knowing that all chemical reactions require activation energy to get started and chemical changes are a result of chemical reactions, choose the best answer.


 

    activation energy     