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Selected topic Pure Substances & Mixtures Science · Matter & Materials · view full details
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Science·Matter & Materials·conceptual

Pure Substances & Mixtures

Distinguish between pure substances and mixtures, identify formulations as useful mixtures with precise compositions, and use melting and boiling points to test for purity

Suggested ages 11–13

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Evidence of understanding

  • Explains why a pure substance has a sharp, fixed melting point but a mixture melts over a range
  • Identifies common formulations (medicines, alloys, paints, fuels) as deliberate mixtures
  • Explains what impurities do to melting and boiling points
  • Distinguishes mixtures from compounds at the particle level

Assessment prompt

If Pure Substances & Mixtures was checking whether a sample of water was pure, could they explain one test they could do — and say what result would tell them it was definitely pure versus a mixture?

Standards alignment

KS3.Sci.Chem.PIS.1GB · uk-nc-2013

Concept of a Pure Substance

The national curriculum in England: Key stages 1 and 2 framework document · KS3

KS3.Sci.Chem.PIS.3GB · uk-nc-2013

Identification of Pure Substances

The national curriculum in England: Key stages 1 and 2 framework document · KS3

KS3.Sci.Chem.PIS.4GB · uk-nc-2013

Formulations

The national curriculum in England: Key stages 1 and 2 framework document · KS3