Topic 9

Question 1

Activation energy

Answer 1

The minimum amount of energy required for particles to collide successfully and cause a reaction.

Question 2

Catalyst

Answer 2

A substance that increases the rate of a reaction without being changed in chemical composition or amount. It works by providing an alternative reaction pathway with a lower activation energy.

Question 3

Collision theory

Answer 3

Reactions occur only when particles collide with sufficient energy (activation energy).