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GCSE Combined Science · key term
A change in which one or more new substances form.
Used by AQA and Edexcel
Specification 6.3.1.2 · Paper 5
Revise: Changes of StateA chemical change, by contrast, produces one or more new substances. Simply reversing a change of state does not restore the original substance after a chemical reaction. The important distinction is whether new substances form, rather than whether a material merely looks different.
Specification States of matter · Paper 3, Paper 4, Paper 5, Paper 6
A change in which a chemical reaction forms one or more new substances.
Revise: States of matterA chemical change is different: a chemical reaction produces new substances. The key distinction is whether a new substance forms, not simply whether the material looks different afterwards.
A change in which different substances are formed.
Do not claim that all chemical changes are irreversible. The important distinction is that chemical changes produce different substances.
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