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Chemical Change

Key Stage 3

Meaning

A chemical change is a change that results in new chemicals being formed.

About Chemical Changes

Chemical changes are usually irreversible. However, some can be reversed.
Chemical changes produce new chemicals which have different physical and chemical properties from the reactants.

Examples

Cooking food involves several chemical changes. Baking a cake and toasting bread causes chemical reactions that are used to change the texture and flavour of the food.

Key Stage 4

Meaning

A chemical change is a change that results in new chemicals being formed.

About Chemical Changes

Chemical changes are usually irreversible. However, some can be reversed.
Chemical changes produce new chemicals which have different physical and chemical properties from the reactants.
In a chemical change the atoms in molecules are rearranged to form new molecules.

References

Edexcel

Chemical changes, page 182, GCSE Physics, Pearson Edexcel
Chemical changes, page 414, GCSE Combined Science, Pearson Edexcel
Chemical changes, pages 12, 35, GCSE Chemistry; The Revision Guide, CGP, Edexcel
Chemical changes, pages 75, 98, GCSE Combined Science; The Revision Guide, CGP, Edexcel