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AQA (KS4)

KS3 & KS4 science curriculum

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Science
Year 8

Understanding chemical reactions

6 lessons

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  • BQ06 Chemistry: How do we explain how substances behave?
  • BQ08 Chemistry: How can substances be made and changed?

Description

This unit covers the conservation of mass in changes of state and chemical reactions, including atom rearrangement. It also focuses on representing reactions with formulae and equations, exploring combustion, decomposition, and displacement, and distinguishing chemical from physical changes.

This unit builds on pupils’ prior learning from Atoms, elements and compounds, where they explored the basic building blocks of matter and how elements combine. It deepens their understanding by examining chemical reactions, focusing on how atoms rearrange to form new substances. This prepares pupils for the next unit, Acids and bases, where they will apply this knowledge to explore specific reactions, such as neutralisation, reinforcing their understanding of how substances interact chemically.

  1. Characteristics of chemical reactions
  2. Conservation of mass and balanced symbol equations
  3. Chemical reactions: oxidation
  4. Chemical reactions: combustion
  5. Chemical reactions: decomposition
  6. Chemical reactions: precipitation

  • Some substances simply form mixtures when they are put together.
  • Mixtures contain substances which are not chemically combined.
  • The substances in a mixture can usually be separated out again.
  • Some substances will dissolve in liquids to form a solution.
  • Dissolving is a reversible state.
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