C9 5.0 / 5 based on 1 rating ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: sophielouise277Created on: 29-01-19 18:06 What is crude oil? It is a finite material found in rocks, formed by remains of sea animals and plants 1 of 29 What is crude oil made of? A mixture of many carbon compounds 2 of 29 What are hydrocarbons? Crude oil only containing carbon and hydrogen atoms 3 of 29 Crude oil must be separated into different substances known as what? Fractions 4 of 29 What can you describe alkanes as? Saturated hydrocarbons 5 of 29 What are all the carbon-carbon bonds? Single, max hydrogen 6 of 29 Chemical formula for Methane? CH4 7 of 29 Chemical formula for Ethane? C2H6 8 of 29 Chemical formula for Propane? C3H8 9 of 29 Chemical formula for Butane? C4H10 10 of 29 General formula for alkane molecules? CnH (2n+2) 11 of 29 Why do small chain hydrocarbons make good fuels? Ignite easily and burn well, less smokey, flammable 12 of 29 4 properties of a short chain hydrocarbon? Low bp, high volatility, low viscosity (runny), high flammable 13 of 29 What is volatility? Tendency to turn into a gas 14 of 29 What is vicosity? How easy it flows 15 of 29 4 properties of long chain hydrocarbon? High bp, low volatility, high viscosity (thick), low flammable 16 of 29 What is the process called that is used to separate hydro carbons? Fractional distillation 17 of 29 What happens to the oil before it goes into tower for fractional distillation? It is vaporised 18 of 29 Where is crude oil fed into? Bottom of tall towerb (fractionating column) 19 of 29 Which direction does of temp does the column go? Decreases as u go up 20 of 29 What are the products of complete combustion of a hydrocarbon? Carbon dioxide and water 21 of 29 How to test for water formed in complete combustion? Blue cobalt chloride paper or white anhydrous copper sulfate which goes blue 22 of 29 What is produced in incomplete combustion? Carbon monoxide 23 of 29 What is cracking? The breakdown of larger hydrocarbon molecules into small ones 24 of 29 Where does cracking happen? Oil refinery in steel vessels called crackers 25 of 29 What happens when the hydrocarbons have been vaporised after fractional distillation? Passed over hot catalyst, mixed w steam and heated to high temp 26 of 29 What are unsaturated hydrocarbons? Alkenes 27 of 29 What do alkenes always have? A double c-c bond 28 of 29 What do alkenes do in air and to bromine water? Burn in it and colourise the orange bromine water 29 of 29
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