Sciences Co-ordinated 0654/53 Oct Nov 2024 | Cambridge IGCSE Past Papers With Mark Scheme

1. Enzyme-Catalyzed Reactions | Investigating catalase activity in yeast, measuring foam height, importance of stirring, and improving measurement accuracy.

2. Effect of Mouthwash on Saliva pH | Planning an investigation on mouthwash volume vs. saliva pH change, including controlled variables and result processing.

3. Thermal Decomposition of Metal Carbonates | Heating metal carbonates, recording reaction times, determining reactivity order, and safety precautions in gas release.

4. Electrochemical Cell Voltage & Metal Reactivity | Measuring voltage differences in metal pairs, ranking metals by reactivity, and comparing experimental accuracy.

5. Resistance Wire & Voltage Measurements | Investigating voltage across different wire lengths, plotting graphs, and analyzing resistance variation.

6. Density of Water Measurement | Comparing two methods using mass and volume calculations, ensuring accuracy, and justifying procedural steps.