oils, earth and atmosphere revision notes.

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Cracking hydrocarbons.

  • we can split large hydrocarbon molecules up into smaller molecules by heating them and passing the gas over a catalyst.
  • cracking produces unsaturated hydrocarbons, which we can alkenes.
  • alkenes burn, and also react with bromine water, producing colourless products.

Making polymers from alkenes.

  • plastics are made of polymers.
  • polymers are large molecules (small molecules) join together.

The properties of plastics.

  • monomers affect the properties of the polymers that they produce.
  • changing reaction conditions can also change the type of polymers that is produced.

New and useful polymers.

  • new polymers are being developed all the time. they are designed to have properties that make them specially suited for certain uses.
  • smart polymers may have their properties changed by other changes in their surroundings.


Extracting vegetable oils.

  • vegetable oils can be extracted from plants by pressing or by important foods.
  • vegetable oils are important foods.
  • unsaturated oils contain carbon-carbon double bonds. we can detect them using bromine or iodine solutions.

Cooking with vegetable oils.

  • vegetable oils are useful in cooking because


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