Chemistry 9701/52 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Saturation and solubility of calcium hydroxide in water, filtration effects on titration results, and preparation of standard hydrochloric acid solutions for titration experiments.

2. Rate of reaction for sodium thiosulfate with hydrochloric acid using the disappearing cross experiment; determination of activation energy using Arrhenius plot analysis, gradient calculations, and impact of concentration changes on reaction rates.

3. Investigating magnesium's reaction with hydrochloric acid to determine reaction order; variations in acid concentration, dependent variables, and factors influencing the accuracy of recorded reaction times.

4. Methodological factors affecting experimental outcomes, including precise volume measurement, timing accuracy, and anomalous data points in kinetic studies.

5. Application of graph-based analysis for kinetic parameters, including correlation of reaction rates to temperature changes and their subsequent interpretation for energy barrier estimations.

6. Practical approaches to controlling experimental variables, including reactant concentrations, apparatus consistency, and reaction conditions for reproducible chemical kinetics studies.