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Science at key stage 3    (Year 7)

Unit 7H: Solutions
Section 10: Reviewing work

QCA

Objectives
Children should learn:
  • to identify key points about changes involving making and separating solutions
  • to explain changes and techniques

Activities

Outcomes
Children:
  • Provide pupils in groups with two sets of cards: each card in one set has the name of a change or technique, each card in the other set has the explanation of a change or technique. Ask them to match the correct explanation to the change or technique. For some pupils increase the range of changes, including some incorrect explanations to encourage discussion and deeper thinking about the phenomena.
  • Ask pupils to work in groups and list the key ideas about the changes, including two examples of each. Ask them for their ideas and discuss the changes, emphasising that those encountered in this unit can be relatively easily reversed. Together with pupils agree a summary of the unit.
  • match the correct explanation to each change
  • identify, with reasons, incorrect explanations
  • summarise key points about changes and techniques in the unit

Points to note
  • Unit 8E 'Atoms and elements' introduces the idea of chemical change as changes in which atoms are joined in new ways, making new materials.

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 can we tell whether a liquid is a mixture?
2. How much salt can we get from rock salt?
3. What happens to the solute when a solution is made?
4. How can we separate solvents from solutes?
5. a. How can chromatography separate and identify substances in mixtures?
6. b. How can chromatography separate and identify substances in mixtures?
7. Checking progress
8. Is there a limit to the amount of solid that will dissolve in a liquid?
9. What else affects solubility?
10. Reviewing work