chlorofluorocarbons

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Last updated 9:34 AM on 9/24/24
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6 Terms

1
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Chloroflourocarbons

  • Contain : chlorine, fluorine and carbon (hydrogens replaced )

  • Stable, volatile, non-flammable + non toxic

  • Used in: fridge, aerosol cans dry cleaning and air conditioning

  • But destroy ozone

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Ozone layer

Is in layer in atmosphere called stratosphere

Contains mostly O 3 (ozone) + acts as chemical sunscreen

Absorbs UV light → sunburn / skin cancer

Formed when O2 → broken down into 2 free radicals t other free radicals attack O2→O3

<p>Is in layer in atmosphere called stratosphere</p><p>Contains mostly O 3 (ozone) + acts as chemical sunscreen</p><p>Absorbs UV light → sunburn / skin cancer</p><p>Formed when O2 → broken down into 2 free radicals t other free radicals attack O2→O3</p>
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Holes in the ozone layer

Discovering thinning out near artic and Antarctica

Bad = harmful UV radiation reaches earth

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Free radicalisation with chlorofluorocarbons

Formed because when CFCs travel up they absorb UV = split chlorine = free radicals → catalyse & ozone destruction

One Cl*= 10000 O3 destroyed

<p>Formed because when CFCs travel up they absorb UV = split chlorine = free radicals → catalyse &amp; ozone destruction</p><p>One Cl*= 10000 O3 destroyed</p>
5
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Nitrogen oxides and the ozone layer

NO* radicals from nitrogen oxides also destroy ozone layer

Prod. by cars, aircraft engines and thunderstorms

Free radicals act as catalysts

<p>NO* radicals from nitrogen oxides also destroy ozone layer</p><p>Prod. by cars, aircraft engines and thunderstorms</p><p>Free radicals act as catalysts</p>
6
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Alternatives to CFCs:HFCs and HCFCs

Used as temporary alternatives until safer products an developed

Disadvantages:

Hang around atmosphere = disruption

Still damage ozone layer but less than CFCs

Greenhouse gages