CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
Describe the reaction when an excess of zinc powder is added to an aqueous solution of copper(II) sulfate and the mixture is stirred until no further change occurs. The solution had been prepared by dissolving hydrated copper(II) sulfate, , in water. Include the observations, the balanced ionic equation with state symbols, the reason the sulfate ion is not included in the ionic equation, and what is meant by water of crystallisation.
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.
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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