Energy transfer — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Hydrogen as a fuel and fuel burning are covered; fuel-cell construction/comparison and additional petroleum fractions extend these outcomes.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- igcse-cambridge-cie-0652 2025–2026 · C6.2; C6.1; C12.2
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