Explain4 marksStandard
A student adds aqueous ammonia, in small portions, to an aqueous solution of copper(II) sulfate. Explain, in terms of ligand exchange, what the student observes and why the changes occur.
CAIE A Level Chemistry 9701 · Chemistry of transition elements
Chemistry of transition elements: 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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