Answer the following question: Answer the following question given this paragraph: Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy . For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning of gasoline in the engine. The combustion of gas won't occur without the spark of energy to begin the reaction. Q: What do chemical reactions need to be activated? A:

OPTIONS: *food *space *products *energy
Answer:
energy