Describe5 marksStandard
A student heats a sample of magnesium carbonate strongly and observes that it decomposes. State and explain the trend in thermal stability of the carbonates of the Group 2 elements as you go down the group.
CAIE A Level Chemistry 9701 · Group 2
Group 2: describe question
How this question is marked
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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