Question

question 2 of 10
what is the activation energy of a reaction?
a. the energy the molecules must have in order to react
b. the energy that is given off when a reaction happens
c. the speed at which the molecules must be moving in order to
react
d. the kinetic energy of the colliding molecules

Explanation:

Activation energy is the minimum energy that molecules must possess for a chemical reaction to occur. Option B refers to the energy change (exothermic or endothermic) of a reaction, not activation energy. Option C is about speed (related to kinetic energy and collision frequency but not the definition of activation energy). Option D is just the kinetic energy of colliding molecules, which is not the specific concept of activation energy. Option A correctly defines activation energy as the energy molecules must have to react.

Answer:

A. The energy the molecules must have in order to react