Question

Which of the following is true regarding activation energy?

A. It is required only in endothermic reactions.
B. It does not hold up a reaction from starting.
C. This energy usually comes in the form of light or heat.
D. It is required only in exothermic reactions.

Answer 1

The correct option is C.
Activation energy is the energy barrier that must be overcome before a chemical reaction can take place. It is the minimum amount of energy that the reacting species must possesses in order for the reaction to occur. Activation energy may be in form of light or heat.