Chemical Change - GCSE Chemistry Definition

A chemical change is a process in which substances react together to form one or more different substances with new chemical properties. During a chemical change, the original substances' molecular structures are altered, resulting in the formation of new chemical bonds.

These changes are usually irreversible and often involve observable signs such as colour changes, temperature shifts, gas production, or precipitate formation.

For GCSE Chemistry students, understanding chemical changes helps in recognising how compounds interact and transform, highlighting fundamental concepts of reactivity and conservation of mass.