CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
Blue hydrated copper(II) sulfate, , turns white when heated. The white solid formed is anhydrous copper(II) sulfate, . Compare the hydrated and anhydrous forms of copper(II) sulfate. In your answer, explain what is meant by the terms hydrated and anhydrous and what the formulas show about the water of crystallisation. Include a balanced equation, with state symbols, for the change that occurs.
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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