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 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.
  • CFCs cause global warming.
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2. Why were CFCs initially used?

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

3. 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

4. The reaction between CFCs and ozone is an example of what kind of reaction?

  • Electrophilic addition
  • Nucleophilic substitution
  • Free radical substitution
  • Dehydration

5. Where is ozone found?

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


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