What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to elements, compounds and mixtures. 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 elements, compounds and mixtures, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Calling air a compound. Its gases are not chemically combined and its composition varies.
- Saying a mixture of two elements is a compound because it contains two elements. Combination, not company, makes a compound.
- Saying a compound can be separated by filtering or distilling.
- Saying an element cannot be a molecule. O₂, N₂, Cl₂ and S₈ are all elements made of molecules.
- Expecting a mixture to have a sharp melting point.
- Saying iron(II) sulfide is magnetic because it contains iron. The iron is bonded and no longer behaves as iron.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Elements, compounds and mixtures revision notes.