Year 8 · Science · beta

Understanding chemical reactions

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 is an attributed Oak National Academy lesson sequence, not a completed or academically approved DASKEREL course. Supporting transcripts may depend on video, images, practical equipment or teacher explanation. Follow each lesson’s supervision guidance. For religious education and RSHE, follow the school’s syllabus, policy and safeguarding procedures.

Prior knowledge

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.

Source curriculum references

Evaluate risks
Use appropriate techniques, apparatus, and materials during fieldwork and laboratory work, paying attention to health and safety
Make and record observations and measurements using a range of methods for different investigations; and evaluate the reliability of methods and suggest possible improvements
Interpret observations and data, including identifying patterns and using observations, measurements and data to draw conclusions
Conservation of mass changes of state and chemical reactions
Chemical reactions as the rearrangement of atoms
Representing chemical reactions using formulae and using equations
Combustion, thermal decomposition, oxidation and displacement reactions
Conservation of material and of mass, and reversibility, in melting, freezing, evaporation, sublimation, condensation, dissolving
The difference between chemical and physical changes

Oak source metadata. DASKEREL has not independently verified school-level coverage.

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