Chemical Reaction - GCSE Chemistry Definition

A chemical reaction is a process where substances, known as reactants, are transformed into different substances called products. During this change, the original bonds between atoms in the reactants are broken, and new bonds are formed to create the products. This process often results in observable phenomena such as colour changes, temperature shifts, gas production, or the formation of a precipitate.

Chemical reactions are fundamental to understanding how substances interact and change, and they follow the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction. This concept is crucial for students studying GCSE Chemistry, as it helps explain both everyday occurrences and more complex scientific principles.