Organic Chemistry 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: katforrestCreated on: 20-09-17 21:00 Define Hydrocarbon A compound made up of only hydrogen and carbon 1 of 14 What is crude oil made up from? A mixture of different length hydrocarbons 2 of 14 What is the general formula for alkanes? CnH2n+2 3 of 14 What is the formula for methane? CH4 4 of 14 What is the formula for ethane? C2H6 5 of 14 What is the formula for propane? C3H8 6 of 14 What is the formula for butane? C4H10 7 of 14 Why do we need to separate crude oil into fractions? Each different fraction has different boiling points 8 of 14 How does boiling point change with chain length? Small chains - low boiling point 9 of 14 How does viscosity change with chain length? Large chains - very viscous 10 of 14 How does flammability change with chain length? Small chains - high flammability 11 of 14 Write the word equation for complete combustion hydrocarbon + oxygen --> carbon dioxide + water 12 of 14 Why do we need to crack long hydrocarbons? Long chains aren't very useful 13 of 14 How do we test for alkenes? Bromine water test: orange to colourless 14 of 14
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