Sciences Co-ordinated 0654/52 Oct Nov 2024 | Cambridge IGCSE Past Papers With Mark Scheme

1. Enzyme Activity & Hydrogen Peroxide Breakdown | Investigating catalase reaction with varying hydrogen peroxide concentrations, measuring foam height, and ensuring experimental accuracy.

2. Mouthwash & Saliva pH Investigation | Planning an experiment to determine the effect of mouthwash on saliva pH, including controlled variables and data processing.

3. Thermal Decomposition of Metal Carbonates | Heating different metal carbonates, measuring reaction time, analyzing color changes, and ranking metals by reactivity.

4. Electrochemical Cells & Metal Reactivity | Measuring voltages in salt solution with different metal pairs, determining relative reactivity, and comparing accuracy with thermal decomposition results.

5. Resistance in Electrical Circuits | Investigating the relationship between wire length and potential difference, plotting graphs, calculating ratios, and analyzing accuracy.

6. Density of Water Using Two Methods | Measuring mass and volume to determine water density, comparing displacement vs. direct measurement, and ensuring reading accuracy.