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Across 1. a chemical reaction that takes in heat energy 3. a very large molecule, made up of lots of monomers 4. a substance that is made only of hydrogen and carbon 6. the water HATING part of an emulsifier molecule 7. the chemical needed for combustion (burning) 8. a chemical reaction that gives out heat energy 9. a hydrocarbon with double bonds 10. the process of breaking up crude oil into smaller molecules 11. this is made when alcohol reacts with acid, used in perfumes

Down 2. a poisonous gas released when a fuel is burned without enough oxygen 4. the water LOVING part of an emulsifier molecule 5. the name for the useful parts of crude oil 9. a hydrocarbon with single bonds only