Chemistry C7

  • 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
  • Non-renewable
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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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