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CAIE A Level Chemistry 9701 · Group 2

Group 2: suggest question

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Calcium reacts with cold water to form calcium hydroxide and hydrogen. Calcium also reacts with dilute hydrochloric acid, and calcium carbonate reacts with dilute hydrochloric acid.

(a) Suggest the observations you would make when a small piece of calcium is added to cold water.

(b) Write an equation for the reaction of calcium with dilute hydrochloric acid.

(c) Write an equation for the reaction of calcium carbonate with dilute hydrochloric acid.

(d) Calcium hydroxide is slightly soluble in water. State, with a reason, how the solubility of barium hydroxide compares with that of calcium hydroxide.

(e) Suggest, with a reason, how the thermal stability of barium carbonate compares with that of calcium carbonate.

0 words · 7 marks

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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.

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.

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