Chemistry 9701/34 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Reaction kinetics: Hydrogen peroxide decomposition with manganese(IV) oxide as a catalyst, including the measurement of oxygen produced over time to calculate concentration.
2. Concentration determination: Using gas volume and titration methods to determine hydrogen peroxide concentration, including the application of stoichiometric calculations.
3. Error analysis: Evaluating the effect of missing data points, such as volume measurements, on the calculated reaction rate and identifying possible experimental improvements.
4. Catalysis: Understanding how varying the amount of catalyst (manganese(IV) oxide) impacts the reaction, and interpreting the effects on reaction rates and results.
5. Titration techniques: Conducting accurate titrations using potassium manganate(VII) to determine the concentration of hydrogen peroxide, with a focus on correct pipetting and burette readings.
6. Sources of error: Identifying and minimizing errors in both gas collection and titration, with suggested methods for improving accuracy in concentration determinations.
7. Concentration calculation: Determining the actual and theoretical concentration differences of hydrogen peroxide, including calculating percentage differences and explaining the causes of discrepancies.