- Created by: abbiedye
- Created on: 25-07-18 15:18
What are hydrocarbons?
- A compound formed from carbon and hydrogen atoms only
- Examples contain: methane, ethane, propane, and butane
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What effects hydrocarbon properties?
- As the length changes, the properties change
- The shorter the chain of hydrocarbons, the runnier (less viscous) it is, the more volatile (low boiling point) and the more flammable it is
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When does complete combustion occur?
- Complete combustion occurs when there is plenty of oxygen
- hydrocarbon + oxygen -> carbon dioxide + water (+energy)
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How is crude oil made?
- Fossil fuels
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What is fractional distillation?
It is used to separate hydrocarbon fractions
- 3 hydrocarbons = LPG (Liquified Petroleum Gas)
- 8 hydrocarbons = Petrol
- 15 hydrocarbons = Kerosene
- 20 hydrocarbons = Diesel oil
- 40 hydrocarbons = Heavy fuel oil - Bitumen
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How is crude oil used in modern life?
- Fuel for most modern transport
- Feedstock to make new compounds (polymers, solvents, lubricants, and detergents)
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What is cracking
- The process of splitting up long-chain hydrocarbons
- The smaller chains are more useful hydrocarbons
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What are the different methods of cracking?
- Thermal decomposition - heating them
- Cause long chains to split
- Mixed with steam = steam cracking
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