Chemistry 9701/33 May June 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Rate of Thiosulfate Reaction: Investigating the effect of thiosulfate concentration on the rate of reaction, measuring time for sulfur precipitation, and calculating the reaction rate using reaction time data.
2. Graphical Representation of Reaction Rate: Plotting reaction rate against thiosulfate volume, analyzing the relationship between reaction rate and concentration.
3. Accuracy and Error in Reaction Time: Calculating minimum reaction rate values considering error margins and explaining experimental anomalies.
4. Preparation of Thiosulfate Solutions: Preparing different concentrations of sodium thiosulfate, ensuring correct volume and concentration measurements, and using standard laboratory apparatus.
5. Enthalpy Change of Solution: Investigating the enthalpy change when dissolving hydrated sodium thiosulfate, calculating moles, energy change, and enthalpy change.
6. Improvement in Experiment Accuracy: Suggesting improvements for accuracy in measuring enthalpy change and explaining why these would help achieve more reliable results.