Science at key stage 3 (Year 8)
Unit 8F: Compounds and mixtures
Section 1: How are elements and compounds different?
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Objectives |
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- that elements contain only one kind of atom
- that compounds contain more than one kind of atom joined together
- that formulae indicate the (relative) numbers of atoms in a compound
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Activities |
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Outcomes |
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Children: |
- Review and extend pupils' understanding of the difference between elements and compounds or non-elements by providing them with a series of cards, the first giving a description of appearance, the second the formula and the third the composition,
eg one atom of oxygen joined to two atoms of hydrogen, and asking pupils in groups to match them in sets of three and to sort into elements and non-elements.
- Make sure that pupils are clear that compounds contain atoms of more than one kind joined together.
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- distinguish between elements and compounds
- relate formulae to the numbers and types of atom in a compound
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Points to note |
- If unit 8E 'Atoms and elements' and unit 8F 'Compounds and mixtures' are taught in a block, pupils may need to spend less time on these introductory activities. If they are not, teachers may need to provide a context in which ideas can be revisited.
- If ionic compounds are included, it is sufficient to treat the formula as a ratio,
eg one atom of magnesium to one of oxygen in magnesium oxide. It is important not to imply that ionic compounds consist of molecules.
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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.
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