Chemistry 9701/53 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating Electrostatic Attraction in Trichloromethane and Propanone: Experiments measuring temperature changes when equal volumes of trichloromethane and propanone are mixed, including predictions, methods, and precautions for accurate results.
2. Improving Experimental Accuracy: Suggestions to reduce heat loss and improve the reliability of the temperature measurements during the experiment, with a focus on safety considerations for handling volatile chemicals.
3. Calculating Enthalpy Change for Electrostatic Attraction: Using experimental data to calculate the enthalpy change (∆H) associated with the electrostatic attraction between trichloromethane and propanone.
4. Titration and Energy Calculations for Mixtures: Determining the number of moles of trichloromethane and propanone, and calculating the enthalpy change for the mixture based on the energy released in the experiment.
5. Experiment to Test Effect of Moles on Temperature Change: Proposing an experiment to test how varying the number of moles of trichloromethane affects the temperature change in the reaction.
6. Nitrogen Dioxide and Dinitrogen Tetroxide Equilibrium: Preparing nitrogen dioxide and investigating the variation of Kp with temperature, including calculating Kp values, plotting graphs, and analyzing experimental accuracy.
7. Improving Experimental Conditions and Accuracy: Suggestions for improving the accuracy of experiments involving temperature and gas volume measurements in equilibrium studies.
8. Analysis of the Effects of Temperature on Kp: Using graph analysis to calculate the gradient and determine the enthalpy change (∆H) for the equilibrium involving nitrogen dioxide and dinitrogen tetroxide.
9. Color Change in Nitrogen Dioxide and Dinitrogen Tetroxide: Explaining how temperature affects the color of the equilibrium mixture of NO2 and N2O4, based on the data from Kp experiments.