Pure substances

Chemistry (Combined Science) · GCSE · AQA · AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Foundation · Specification point · 5.8.1.1 · Chemical analysis · Purity, formulations and chromatography

Using melting point and boiling point to test purity

Pure substances in chemistry

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5.8.1.1 Pure substances

Content	Key opportunities for skills development
$In chemistry, a pure substance is a single element or compound, not mixed with any other substance. Pure elements and compounds melt and boil at specific temperatures. Melting point and boiling point data can be used to distinguish pure substances from mixtures. In everyday language, a pure substance can mean a substance that has had nothing added to it, so it is unadulterated and in its natural state, eg pure milk. Students should be able to use melting point and boiling point data to distinguish pure from impure substances.$	$WS 2.2, 4.1$

Content

Key opportunities for skills development

In chemistry, a pure substance is a single element or compound, not mixed with any other substance. Pure elements and compounds melt and boil at specific temperatures. Melting point and boiling point data can be used to distinguish pure substances from mixtures. In everyday language, a pure substance can mean a substance that has had nothing added to it, so it is unadulterated and in its natural state, eg pure milk. Students should be able to use melting point and boiling point data to distinguish pure from impure substances.

WS 2.2, 4.1

Pure substances (5.8.1.1) | AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Foundation | KnowledgeSet