cracking

breaking down molecules by heating them - thermal decomposition

hydrocarbon is heated to turn into gas

gas passed over catalyst

large molecules broken down spilt apart  - crack

also can mix with steam and gas - at high temperature

alkanes

general  formula - cnh2n+2

saturated

no double bonds

stays orange

alkenes

general formula - cnh2n

double bonds

unstaurated

orange from colourless

ethene can be hydrated with steam to make ethanol

fermentation uses yeast to make sugar to make ethanol

sugar (arrow) carbon dioxide + ethanol

polymersation means short alkenes molecules momners joining together to form long molecules polymers

oil crushed plant material

crushed plant material between metal plates and oil is out

water and other impurties are also out

wegners noticed that fossils where the same on the opposite side on the analtic ocean

biogerable means breaking down of microorganisms

emulsion means water and other droplets supsend on to other liquid

emulsifies naturally water and oil want to seperate but emulifsirer stop emulsion from seperating and make more stable

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