CAIE IGCSE Chemistry Physical and Chemical Changes Overview

Practise distinguishing physical and chemical changes from reversibility or new substances and recognising thermal decomposition from equations and observations.

Exam points

identify a physical change when no new substance forms and the process is physically reversible
identify a chemical change from new products, colour change, gas formation or energy transfer
define thermal decomposition as one substance breaking down into simpler substances on heating

Covered syllabus points

6.1.1—Physical and chemical changes, and

[Maximum number: 1]

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

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

Figure for Question 6.1 Physical and chemical changes question 1 — CAIE IGCSE Chemistry

Which step involves a physical change?

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Covered syllabus points

6.1 Physical and chemical changes question 1