Catalyst - GCSE Chemistry Definition

A catalyst is a substance that speeds up the rate of a chemical reaction without being consumed or permanently changed by the reaction itself. It works by lowering the activation energy needed for the reaction to proceed, allowing it to occur more quickly and efficiently. Importantly, since catalysts are not used up in the reaction, they can be used repeatedly.

In the context of GCSE Chemistry, understanding catalysts is important for appreciating how they are used in various industrial processes to enhance production efficiency and reduce energy costs, like in the manufacture of ammonia in the Haber process.