Chemistry 9701/36 Oct Nov 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Zinc Purity and Displacement Reaction:
- Investigating the percentage purity of zinc by reacting it with excess aqueous copper(II) sulfate.
- Calculating the heat energy released during the displacement reaction and determining the enthalpy change for the reaction.
- Comparing the experimental results with the theoretical values to calculate the percentage of zinc in an impure sample.

2. Copper(II) Sulfate Hydration:
- Determining the number of moles of water of crystallization in copper(II) sulfate using heating to remove water.
- Performing mass measurements to calculate the amount of water lost and deducing the formula of hydrated copper(II) sulfate.

3. Qualitative Analysis:
- Performing qualitative tests on solutions containing cations and anions (e.g., reactions with sodium carbonate, acidified potassium manganate, and Tollens' reagent).
- Identifying the cation and anion present in the given solutions based on observed reactions.

4. Reactions with Magnesium:
- Measuring the temperature changes when magnesium reacts with different solutions to analyze the heat released in the reactions.