Chemistry 9701/31 Oct Nov 2021 | Cambridge AS Level Past Papers With Mark Scheme

1. Decomposition of Group 1 carbonates, quantitative mass analysis of CO2 released, mole calculations, and identification of the metal ion in carbonate samples through relative atomic mass analysis.

2. Acid-base titration of Group 1 hydroxides with sulfuric acid, molar concentration determination, calculation of relative atomic masses, and precision of experimental data through percentage difference analysis.

3. Qualitative tests on solutions containing anions and cations, identification of gases and precipitates, solubility trends, and chemical reactivity analysis under controlled conditions.

4. Redox tests using acidified potassium manganate(VII) and metal reactivity with magnesium, observations of oxidation states, and implications for the reducing or oxidizing properties of tested solutions.

5. Practical applications of stoichiometry and periodic table data in determining chemical properties and verifying chemical reactions through qualitative and quantitative methods.

6. Integration of titration, decomposition, and qualitative analysis techniques to identify unknown compounds and validate experimental outcomes using observed results.