Explain4 marksStandard
Explain the trend in reactivity of Group 2 elements with water. Use the reactions of magnesium and barium with water (or steam) to illustrate your answer, and include balanced chemical equations for these reactions.
CAIE A Level Chemistry 9701 · Group 2
Group 2: explain question
How this question is marked
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.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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