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Science at key stage 3    (Year 8)

Unit 8F: Compounds and mixtures
Section 9: Reviewing work

QCA

Objectives
Children should learn:
  • about key differences between elements, mixtures and compounds

Activities

Outcomes
Children:
  • Give pupils a list of statements, eg
    • is made up of atoms
    • has a definite composition
    • is a result of atoms joining together
    • contains different substances which are not chemically combined
    • can be represented by a chemical formula
    Ask them to assign each to one or more of element, compound and mixture.
  • Some pupils will also be able to sort the statements in each category so that similar ones are grouped together. Check those that apply to two or to all three, eg contains molecules, and those which are 'difficult', and agree a summary sheet consisting of correctly allocated statements. Ask them to add familiar examples of elements, compounds and mixtures to their summary sheet.
  • identify characteristics of elements, compounds and mixtures, explaining the basis for their decisions

Points to note
  • Extension: for some pupils more complex statements could be used, eg contains some substances with a definite composition.
  • This activity extends the first part of the 'reviewing work' activity at the end of unit 8E 'Atoms and elements'. It may be helpful to use the same statements, together with additional ones, and ask pupils whether they feel more confident in assigning the statements.

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