2.1.11

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.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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