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GCSE Chemistry · key term
A characteristic describing how a substance reacts and what new substances it forms.
Used by Edexcel and OCR
Specification 1.13, 8.6 · Paper 1, Paper 2
A measurable or observable characteristic of an element or compound, such as its reactivity or the formulae of the compounds it forms.
A characteristic describing how a substance reacts to form other substances.
Specification C2.2a, C4.1a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A characteristic describing how a substance reacts and changes into new substances.
Revise: Metals vs Non-MetalsA chemical property describes how a substance reacts to form new substances, such as whether it reacts with oxygen or forms positive or negative ions.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A property describing how a substance reacts and forms new substances.
Revise: Metals vs non-metalsA physical property can be observed or measured without making a new substance; a chemical property concerns how an element reacts to make new substances.
If asked how Mendeleev arranged the table, include both parts of the method: he generally used increasing relative atomic mass and kept elements with similar chemical properties together.
If mass order and chemical properties appeared to conflict, explain that Mendeleev sometimes prioritised the pattern of chemical properties rather than forcing a strict mass order.
Keep physical and chemical properties distinct: physical properties change gradually across the series, whereas chemical properties are similar.
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