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

Fact 2: Chemical equations describe chemical reactions.

Given the two facts above, answer the question "What describes something that requires activation energy to get started?" with the following options: 
- igniting fuel and oxidiser
 - heating liquids
 - Fully cooking the oysters
 - Riding a bike
 - an engine
 - burning coal
 - chemical equations
 - Firecrackers


 

       chemical equations  