Science Combined 0653/33 Oct Nov 2024 | Cambridge IGCSE Past Papers With Mark Scheme

1. Digestive System & Enzyme Activity | Identifying alimentary canal structures, enzyme function, temperature effects on enzyme activity, and fat digestion tests.

2. Chemical Reactions & Reactivity Series | Calcium reaction with hydrochloric acid, gas tests, metal reactivity comparison, and properties of transition metals.

3. Electric Circuits & Resistance Calculation | Determining resistance using Ohm’s law, effects of series and parallel connections on current flow.

4. Circulatory System & Blood Components | Heart structure, pulmonary artery function, increased blood flow during exercise, red blood cell and plasma functions.

5. Air Composition & Pollution | Major air components, identification of pollutants, effects of carbon monoxide, methane properties, and greenhouse gases.

6. Forces & Motion | Constant speed conditions, kinetic and potential energy, force application effects, and hearing range comparison between humans and horses.

7. Photosynthesis & Water Transport | Starch testing in plants, chlorophyll importance, water movement through roots and leaves, food chain construction.

8. Electrolysis of Sulfuric Acid | Identifying products at electrodes, inert electrode materials, and electrolyte requirements for conductivity.

9. Thermal Expansion & Density Changes | Calculating candle weight, placing infrared in the electromagnetic spectrum, estimating wax melting point, and explaining density changes during melting.