Cracking breaks down bigger hydrocarbon molecules to smaller, more useful molecules
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C1P2/2. List the method of cracking
-Heating an oil fraction to a high temp.-Hydrocarbons of the fraction vaporise the vapour passes over a hot catalyst -Alkane molecules in the vapour break down to form smaller molecules in thermal decomposition
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C1P2/3.What are Alkenes?
Alkene are hydrocarbons that contains a double bond between two carbon atoms
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C1P2/4.What is the general formula for Alkenes?
CnH2n
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C1P2/5.How do you test if a hydrocarbon is an Alkane or Alkene?
By bromine water- Alkene=Unsaturated hydrocarbon so it will make bromine water colourless
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C1P2/6.What is the formula for Ethene?
C3H6
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C1P2/7.What are polymers made from?
Lots of repeating monomers
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C1P2/8. What is polymerisation?
A reaction where monomer molecules join together to make a polymer
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C1P2/9. Problems with polymers?
- Non-biodegradable so takes up land fill sites// Crude oil is raw material for polymers
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C1P2/10. Problems with recycling and burning polymers?
-Storage space?, transport uses fuel, has to be sorted-time consuming and expensive/// Burning- releases toxic gases although useful
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C1P2/11.Problem with making plastic bags with maize?
-unethical, raw material has to be sorted but it is bio-degradable
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C1P2/12. Name two ways of making ethanol
- Steam + ethene or ehtanol can be made from sugars by fermentation
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C1P2/13. Give ads of making ethanol with steam
-continuous as long as there is steam, no waste products
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C1P2/14. Give disads of making ethanol with steam
-Ethene=non renewable as it is made from crude oil
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C1P2/15. Give ads of making ethanol by sugar
- provides many jobs, needs less energy due to lower temperature,renewable
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C1P2/16. Give disads of making ethanol by sugar
- unethical , raw materials have to be sorted, waste product = CO2
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Other cards in this set
Card 2
Front
C1P2/2. List the method of cracking
Back
-Heating an oil fraction to a high temp.-Hydrocarbons of the fraction vaporise the vapour passes over a hot catalyst -Alkane molecules in the vapour break down to form smaller molecules in thermal decomposition
Card 3
Front
C1P2/3.What are Alkenes?
Back
Card 4
Front
C1P2/4.What is the general formula for Alkenes?
Back
Card 5
Front
C1P2/5.How do you test if a hydrocarbon is an Alkane or Alkene?
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