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Chemistry · Paper 2 · Foundation + Higher · C7

Cracking: smaller, useful molecules

Key ideas1 of 3

Break large molecules apart

Cracking breaks large hydrocarbon molecules into smaller, more useful molecules. Products include alkanes and alkenes. Small-molecule fuels are in high demand; alkenes are valuable chemical feedstock.

Cracking example conserving atoms: C₁₀H₂₂ forms C₈H₁₈ and C₂H₄. Stage 1.

Next: Alkenes and the bromine-water test →
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Foundation + Higher · C7. All C7 lessons are shared by Foundation and Higher Tier.

AQA Combined Science Trilogy 8464 · 5.7.1.4. Original notes, questions and diagrams. Models are simplified, not to scale; illustrative data are labelled.