CAIE A Level Chemistry 9701 · Carbonyl compounds
A laboratory has two unlabelled samples, each a colourless liquid. One is propanal and the other is propanone. A student adds a few drops of each liquid to separate warm Fehling's solution.
Suggest what the student would observe for each liquid, and explain why the two observations differ.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.