What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to experimental design. 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 experimental design, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Naming a measuring cylinder where a burette or a pipette is required for an accurate volume.
- Recording a burette reading to one decimal place.
- Saying a gas syringe is more accurate because it is bigger; the real advantage is that no gas dissolves and none escapes.
- Following a reaction by mass loss when the gas produced is hydrogen.
- Saying an impurity raises the melting point. It lowers it.
- Defining a saturated solution without saying "at that temperature".
- Saying a substance is impure because it melts at 122 °C when the book says 122 °C. A sharp value at the book figure is evidence of purity.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Experimental design revision notes.