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Combined science (AQA Higher)
Separating substances

Starter quiz

  • A mixture is a substance which is made up from more than one element and/or compound which are ...
    • chemically bonded together.
    • not chemically bonded together.  ✓
    • always have the same boiling point.
    • always in the same state.
  • ______ is the process by which a gas is cooled into a liquid.
    • 'condensation' ✓
  • Air is an example of ...
    • an element.
    • a compound.
    • a mixture.  ✓
  • Match the following statements to make complete sentences about pure substances and mixtures.
    • A pure substance boils ...
      ⇔
      at a fixed temperature. ✓
    • A mixture boils ...
      ⇔
      over a range of temperatures. ✓
    • A pure substance consists ...
      ⇔
      of one element or compound only. ✓
    • A mixture consists ...
      ⇔
      of more than one element and/or compound. ✓
    • A pure substance can ...
      ⇔
      not be separated. ✓
    • A mixture can ...
      ⇔
      be separated. ✓
  • Simple distillation can be used to separate solutions. Order the following processes that occur during simple distillation.
    • 1
      ⇔
      Heat the mixture.
    • 2
      ⇔
      The component with lowest boiling point boils.
    • 3
      ⇔
      Vapour is cooled.
    • 4
      ⇔
      Vapour condenses.
    • 5
      ⇔
      Distillate is collected.
  • In the diagram below, give the letters in order for where forces between the particles are overcome or where they are being reformed.
    In the diagram below, give the letters in order for where forces between the particles are overcome or where they are being reformed.
    • c and b
    • b and c
    • a and b  ✓
    • c and a
    • b and a
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