CAIE A Level Chemistry 9701 · Group 2
Describe the trends in the reactions of Group 2 elements (magnesium to barium) and their compounds. In your answer, include balanced chemical equations for: the reaction of a Group 2 metal with oxygen, the reaction of a Group 2 metal with water, the reaction of a Group 2 oxide with water, and the thermal decomposition of a Group 2 carbonate. Also state the variation in the solubilities of Group 2 hydroxides and sulfates.
7 marks, so the mark scheme is looking for about 7 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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