C1A 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEOCR Created by: ellxeCreated on: 29-04-16 19:25 What is crude oil a mixture of? Different hydrocarbons 1 of 11 How are the different hydrocarbons separated? Fractional distillation 2 of 11 Do longer hydrocarbons have higher or lower boiling points? Higher. Drain out of column early 3 of 11 Do shorter hydrocarbons have higher or lower boiling points? Lower. Drain out of column near the top 4 of 11 Is the fractionating column hottest at the top or bottom? Bottom. 5 of 11 What 4 things happen as the size of the hydocarbons increase? Boiling point increases, less flammable, volatility decreases, more viscous 6 of 11 What are the two important bonds in crude oil? Stong covalent bonds and intermolecular forces 7 of 11 What is cracking? Spitting up long-chain hydrocarbons into smaller alkane and alkene molecules 8 of 11 What is cracking a form of? Thermal decomposition 9 of 11 What conditions are needed for cracking? Extremely hot (about 400-700 degrees) and a catalyst 10 of 11 What does cracking help to do? Match supply with demand 11 of 11
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