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Chemical Reactions: Mass, Energy and Catalysts

Compare before and after particle models, check conservation of each atom type, interpret the energy-profile routes and explain how a catalyst changes pathway but not reactants or products.

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Key Stage 3

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Science

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~5 min

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Colouring Sheets

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Compare before and after particle models, check conservation of each atom type, interpret the energy-profile routes and explain how a catalyst changes pathway but not reactants or products.

Use the parent guidance on page 2. Print on A4 paper at actual size or fit to printable area, then encourage careful colouring and discussion of the learning topic.

Use the guidance and answer key on page 2. Answer or assessment rubric: Balanced particle models retain the same number of each atom type while bonds/arrangements change. The higher route represents a larger activation barrier; a catalyst offers a lower-activation-energy pathway and is not used up overall. The closed-vessel balance models conservation of total mass.

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Chemical Reactions: Mass, Energy and Catalysts

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