CAIE IGCSE Chemistry Identifying Physical and Chemical Changes

Practise classifying changes by whether new substances form or the process is physically reversible, using equations and observations as evidence.

Exam points

identify melting, boiling or dissolving as physical when no new substance is formed
identify combustion, neutralisation or metal reactions as chemical from new products
justify a classification using reversibility, product formation, colour or gas evidence

[Maximum number: 1]

Limestone rock is mainly calcium carbonate, $\mathrm{CaCO}_{3}$ .

The 'limestone cycle' is shown. Each step is numbered.

Which step involves a physical change?

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