The Ozone Layer

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1. Why are CFCs harmful to the ozone layer?

  • They break through the ozone layer and might get to outer space.
  • CFCs cause global warming.
  • CFCs are stable molecules so they are whole when they reach the ozone layer. Once there they react with ozone and in the long term can lead to the depletion of ozone. Harmful radiation from the sun can reach the Earth's surface.
  • CFCs are highly reactive and so will react violently with ozone which is dangerous.
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2. Why were CFCs initially used?

  • They are relatively unreactive, non-toxic and have a low flammability
  • They are found readily and in abundance naturally.
  • They are affordable.
  • They are not harmful to human health.

3. What is the role of the ozone layer?

  • It is a protective layer in the atmosphere preventing objects from outer space from entering Earth.
  • It makes sure that the Earth does not get too hot.
  • It absorbs the harmful UV radiation from the sun and so protects organisms on Earth from them.
  • It counteracts global warming.

4. Which equation demonstrates the reaction beween ozone and a CFCs?

  • O3 + Cl --> ClO3
  • O3 + CCl2F2 --> CCl2F2O3
  • O3 + Cl --> O2 + ClO ClO + O --> Cl + O2
  • O3 + CCl2F2 --> CO + 2ClO + F2

5. Where is ozone found?

  • In the stratosphere and on the Earth's surface
  • All around us
  • In the atmosphere
  • In the sky


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