- Ask pupils how a mixture of a solid and liquid,
eg blue ink, or of coloured dyes,
eg inks in a felt-tip pen can be separated. Use secondary sources,
eg video clips, to illustrate that air is a mixture and ask them why it might be important to separate the gases in air. Provide pupils with appropriate information about the separation of air into its components and the uses of these. Extend the work, as appropriate, by asking them to find out differences between inhaled and exhaled air, the importance of ventilation in rooms, how the composition of air dissolved in water varies and about the composition of air in passenger planes. Ask pupils to produce an information leaflet about air reminding them about the importance of organising facts, ideas and information into sentences, which are then grouped into paragraphs with appropriate linkages.
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- name the main gases present in air and give approximate proportions of these
- explain clearly how air can be separated into its components
- describe clearly some uses of the components of air
- sequence and organise ideas into coherent, continuous text
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