2.1.14

Pure Substances

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Pure Substances

Substances can be pure or impure. Pure substances are important in chemistry. Impure substances can affect the results of a practical experiment.

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Purity

  • Pure substances only contain one type of atom, element or compound.
    • Impure substances contain other atoms.
    • Impure substances are a mixture.
  • If a substance contains impurities, the boiling or melting point will change.
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Adding salt to ice

  • We use salt to melt ice and snow.
    • Salt makes the ice more impure.
    • Impure ice has a lower melting point.
    • The impure ice melts at a lower temperature.

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1Biology

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1.2Reproduction & Variation

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2Chemistry

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2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

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3.3Waves

3.4Electricity & Magnetism

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