CFC's and the ozone layer

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  • CFCs and the Ozone Layer
    • Why CFC's appeared to be good at first
      • Non-toxic
      • Non-flammable
      • Chemically inert
      • Ideal for many uses
    • How chlorine free radicals destroy the ozone layer
      • 1) UV light makes the   C-Cl bonds break
      • 2) Cl free radicals from this reaction react with ozone
      • 3) This turns it into  O2 and ClO
      • 4) The reactive ClO molecule reacts with ozone to make 2 O2 molecules and another Cl free radical
      • 5) This Cl free radical is now free to react with another ozone molecule
    • Alternatives to CFC's
      • Alkanes
        • Don't react with ozone
        • Safer than CFCs
      • HFCs
        • Similar to CFCs but contain no chlorine
        • Compounds produced by HFCs don't attack the ozone layer
    • The ozone layer
      • 3 oxygen atoms per ozone molecule
      • The ozone layer is in the upper part of the atmosphere
      • It absorbs UV light
        • The UV light splits up the ozone to make an O2 molecule and an O atom
        • These can then join to make ozone again
      • Depleting the ozone layer makes results in more UV light reaching earth. This causes sun burn and skin cancer (medical issues)


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