which topic is commonly used to explain activation energy and how chemical reactions happen?\n\nreaction…

Brief Explanations:

Collision theory states that for a chemical reaction to occur, reactant particles must collide with each other. However, not all collisions result in a reaction. For a collision to be effective, the particles must collide with a specific minimum amount of kinetic energy, known as the activation energy ($E_a$), and in the correct spatial orientation. This theory provides the fundamental framework for understanding how reaction rates are influenced by temperature, concentration, and catalysts.

Answer:

collision theory