CFCs and chloroalkanes

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free rad sub :( (i don't know if we need to know the whole free rad sub for CFCs)

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8 Terms

1
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give the molecular formula for ozone:

O3

2
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why is UV radiation dangerous?

damages DNA, causing skin cancers

3
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why is ozone significant in the environment?

absorbs UV radiation

4
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what is a CFC?

compound containing only Cl, F and C atoms

<p>compound containing only Cl, F and C atoms </p>
5
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what were CFCs used as?

  • refridgerants

  • solvents

6
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why are CFCs dangerous?

  • Cl radicals formed in upper atmosphere through initiation when UV radiation causes C-Cl bonds in CFCs to break

  • these Cl radicals catalyse the decomposition of ozone and contribute to the hole in the ozone layer

7
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how was the issue of CFCs resolved?

  • research provided evidence for CFCs to be banned as solvents and refridgerants

  • alternative Cl free compounds developed

8
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how do Cl radicals catalyse the decomposition of ozone? which step is this? provide the equations

propagation:

  • Cl . + O3 → ClO . + O2

  • ClO . + O3 → Cl . + 2O2

  • overall: 2O3 → 3O2