Chemistry 5070/42 Oct Nov 2024 | Cambridge O-Level Past Papers With Mark Scheme

1. Preparation of Copper(II) Sulfate Crystals | Reaction of copper(II) oxide with sulfuric acid, crystallization using water bath, importance of controlled heating, and final crystallization steps.

2. Titration of Sodium Carbonate with Hydrochloric Acid | Burette readings, calculating average volume, determining moles of acid, stoichiometry in acid-carbonate reactions, concentration calculations.

3. Qualitative Analysis of Solutions | Flame test for sodium, identification of nitrate anion, reactions of iron(II) with sodium hydroxide and ammonia, and precipitation tests for halide anions.

4. Determining Zinc Content in Muntz Metal | Experiment plan using reaction with sulfuric acid, measuring gas volume or mass loss, ensuring accuracy, and calculating percentage composition.

5. Chemical Identification Tests | Notes on testing for anions, cations, gases, and flame tests for metal ions, including observations and expected results for practical chemistry.