Chemistry 9701,53 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Aspirin Analysis and Experimental Techniques | Determination of aspirin content in tablets, reflux setup, precautions for handling alkaline iodine, and proper filtration techniques.

2. Quantitative Chemical Analysis | Calculations for aspirin mass percentage, stoichiometry of reactions, determination of molar amounts, and error analysis from incomplete drying.

3. Colorimetry and Spectroscopy | Absorbance measurements of crystal violet solutions, appropriate wavelength selection, and preparation of standard solutions.

4. Solution Preparation and Dilution Techniques | Calculation of required solute mass, use of volumetric apparatus, serial dilution method, and accuracy in measuring concentrations.

5. Graphical Analysis and Anomalous Data | Plotting calibration curves, identifying anomalies in experimental data, relationship between concentration and absorbance, and improvements in reliability.

6. Kinetics and Reaction Order Determination | Monitoring reaction progress using colorimetry, determination of half-life, and establishing reaction order based on kinetic data.