What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to simple molecules and covalent bonds. 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 simple molecules and covalent bonds, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying electrons are transferred in a covalent bond. They are shared.
- Drawing brackets and charges on a covalent dot-and-cross diagram.
- Leaving lone pairs off water, ammonia or chlorine.
- Giving carbon 4 electrons in methane instead of counting the shared pairs, which give 8.
- Saying simple molecular substances have low boiling points because their covalent bonds are weak.
- Saying a molecular substance conducts when molten. It has no ions to move.
- Drawing a single bond in O₂ or CO₂, which leaves the atoms short of a full outer shell.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Simple molecules and covalent bonds revision notes.