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GCSE Combined Science · key term
A change in which no new substance forms. When a change of state is reversed, the material recovers its original properties.
Used by AQA and Edexcel
Specification 6.3.1.2 · Paper 5
Revise: Changes of StateChanges of state are physical changes: no new substance forms. If the change is reversed, the material recovers its original properties. Melt ice and then freeze the water again, and it becomes solid ice with the properties it had before melting.
Specification States of matter · Paper 3, Paper 4, Paper 5, Paper 6
A change in which no new substance forms; the chemical identity of the substance stays the same.
Revise: States of matterAll these interconversions are physical changes. The particles' arrangement, movement and energy change, but their chemical identity does not. No new substance forms, and the state change can be reversed by changing the conditions.
A change in which no new substance is formed. Reversing a change of state restores the material's original properties.
Describe changes of state as physical changes because no new substance forms and reversing the change restores the original properties. Avoid claiming that all chemical reactions are irreversible.
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