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CAIE A Level Chemistry 9701 · Chemistry of transition elements

Chemistry of transition elements: compare question

Compare5 marksStandard

Copper(II) sulfate is dissolved in water, giving a pale blue solution. Concentrated hydrochloric acid is added, and the solution turns yellow-green. In a separate experiment, cobalt(II) chloride is dissolved in water, giving a pink solution. Concentrated hydrochloric acid is added, and the solution turns blue.

Compare the ligand exchange reactions that occur in these two experiments. In your answer, identify the ligands involved and the colour changes observed, and explain the changes in coordination number and geometry.

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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.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

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