What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to physical and chemical changes. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on physical and chemical changes, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying mass is not conserved in a chemical change.
- Calling dissolving a chemical change because the solid disappears from view.
- Calling a colour change chemical without checking whether it is simply a solution forming.
- Treating sublimation of iodine as a reaction because the purple vapour looks new.
- Using "irreversible" as the definition, when several reactions in this syllabus reverse on heating.
- Saying a burning candle destroys matter, rather than releasing gases that were not weighed.
- Describing the difference without naming the new substance, which is the mark Cambridge is actually awarding.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Physical and chemical changes revision notes.