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• what are CFCs?

  chlorofluorocarbons, well known haloalkanes

  only contain chlorine, fluorine and carbon - all the hydrogen atoms have been replaced
• what are properties of CFCs?

  stable

  volatile

  non-flammable

  non-toxic
• what were CFCs used in before scientists realised they were destroying the ozone layer?

  fridges

  aerosol cans

  dry cleaning

  air conditioning