Chemistry 0620/53 Oct Nov 2024 | Cambridge IGCSE Past Papers With Mark Scheme

1. Temperature Change in Dissolution | Measuring temperature changes when dissolving solid P, plotting data, calculating rate of temperature decrease, and identifying experimental errors.

2. Qualitative Analysis of Unknown Solids | Heating tests for decomposition, reactions with aqueous sodium hydroxide and ammonia, and precipitation reactions with silver nitrate to identify solid R.

3. Flame Tests and Chemical Reactions | Identifying metal ions using flame colors, reactions with sodium hydroxide, and oxidation tests with potassium manganate(VII) for solid S.

4. Separation and Percentage Composition | Planning an experiment to determine the percentage of calcium carbonate in a mixture using solubility properties and mass calculations.

5. Titration and Acid-Base Reactions | Measuring the concentration of an unknown acid or base, determining endpoint changes, and calculating molarity from titration data.

6. Gas Tests and Flame Color Identification | Using qualitative tests to detect common gases (CO₂, H₂, O₂, Cl₂), and performing flame tests for lithium, sodium, potassium, calcium, barium, and copper.