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Science at key stage 3    (Year 8)

Unit 8F: Compounds and mixtures
Section 8: d. Are there other sorts of material besides elements and compounds?

QCA

Objectives
Children should learn:
  • to decide how many measurements to make
  • to relate results to scientific knowledge and understanding
  • to consider whether there was other evidence they could have collected

Activities

Outcomes
Children:
  • Provide pupils with two liquids labelled A and B (distilled water and salt solution). Tell them that they are going to investigate how temperature changes as they cool (surrounded by an ice/salt mixture) and use this and any other sample tests to find out as much as possible about the liquid. Ask the pupils to plan what to do, including how frequently they will make measurements, and to produce an account of what they did, tables and graphs of results and to use all their results to draw conclusions about the liquids.
  • identify differences between the graphs and explain that these show one is a pure liquid and the other is not
  • suggest additional tests, eg evaporating both liquids, finding the boiling point of both liquids, explaining what these might show

Points to note
  • Pupils are likely to need guidance on how to use the ice/salt mixture. A good supply of ice will be needed for class investigations.
  • A temperature sensor attached to a computer could be used in this activity
  • As an additional or alternative activity, some pupils could investigate the cooling of pure and impure stearic acid.
  • In unit 8I 'Heating and cooling', pupils investigate temperature changes as ice and salol melt and freeze. They could be reminded of this work.

    • Safety

    • teachers will need to check pupils' plans for health and safety before practical work begins

Sections in this unit

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This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.
1. How are elements and compounds different?
2. How do compounds differ from the elements from which they are made?
3. Do compounds react chemically?
4. Checking progress
5. a. Are there other sorts of material besides elements and compounds?
6. b. Are there other sorts of material besides elements and compounds?
7. c. Are there other sorts of material besides elements and compounds?
8. d. Are there other sorts of material besides elements and compounds?
9. Reviewing work