Science Combined 0653/43 Oct Nov 2024 | Cambridge IGCSE Past Papers With Mark Scheme

1. Food Web & Energy Flow | Identifying herbivores, trophic levels, and energy transfer limitations in food chains.

2. Chemical Reactions & Ionic Compounds | Zinc and hydrochloric acid reaction, crystallization of zinc chloride, and ionic charge explanations.

3. Sound Waves & Wave Properties | Sound production, speed differences in mediums, wave refraction, and wavelength calculation.

4. Photosynthesis & Enzyme Activity | Temperature effects on photosynthesis rate, role of stomata, starch storage, and digestive enzyme function.

5. Electrolysis & Gas Production | Ionic breakdown in sulfuric acid, electrode reactions, hydroxide ion behavior, and pH stability.

6. Forces & Motion in Work & Energy | Speed-time graph interpretation, work done calculation, power and energy efficiency in ox-plough movement.

7. Circulatory System & Heart Disease | Blood vessel function, heart pumping mechanism, CHD risk factors, and trend analysis of heart disease prevalence.

8. Organic Chemistry & Hydrocarbon Reactions | Methanol bonding, alkene vs. alkane bonding, combustion properties, and bromine reaction with hydrocarbons.

9. Electric Circuits & Resistance | Circuit analysis, current calculation, headlamp resistance determination, and filament wire resistance comparison.