Crude Oils and Fuels 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: EllieHydeCreated on: 23-02-16 19:04 2654317 Across 1. What kind of polymers change back to their original shape when temperature is changed? (5, 6, 8) 5. What do alkenes contain that alkanes do not? (10) 7. What are crude oils made out of? (12) Down 2. Name the process of breaking down large hydrocarbon molecules into smaller molecules (7, 13) 3. What fuel is made from plant or animal products? (7) 4. Are alkanes saturated or unsaturated? (9) 6. Name the product of incomplete combustion that scientists believe causes global dimming (12)
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