Ozone
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Ozone. Prevents UV-B radiation from reaching the Earth Found in stratosphere When O 2 absorbs UV radiation it breaks down to O + O atoms Free oxygen reacts with O 2 to produce O 3 O 3 absorbs UV radiation and breaks down to O 2 + O

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Ozone

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Ozone

Ozone

Prevents UV-B radiation from reaching the Earth

Found in stratosphere

When O2 absorbs UV radiation it breaks down to O + O atoms

Free oxygen reacts with O2 to produce O3

O3 absorbs UV radiation and breaks down to O2 + O

This back & forth exchange, shields the Earth from the UV radiation


Cfc s

CFC’s

Chlorofluorocarbons are inert –un-reactive, odorless , non-toxic, colorless, nonflammable, noncorrosive – and possess desirable properties as refrigerants, solvents, propellants.

Considered a dream chemical w/ no adverse human or environmental effects

PROBLEM AROSE WITH ITS

LOW REACTIVITY

Un-reactive in the troposphere, but when they reach the stratosphere they react with UV radiation


Cfc s1

CFC’s

UV radiation allows for the breaking off of a chlorine atom.This chlorine atom reacts with ozone

CFCl3 + UV ----- Cl + CFCl2

Cl + O3 - ClO + O2 repeats

ClO + O - Cl + O2 many times


Ultraviolet radiation

Ultraviolet radiation

UV-A has lowest energy, lowest potential for harming life. Not absorbed by the ozone layer

UV-B harmful to life, absorbed by the ozone layer, destruction of stratospheric ozone allows UV-B to pass through

UV-C highest energy. Breaks down oxygen molecules. Absorbed by oxygen in the atmosphere.


Affects of ozone depletion

Affects of ozone depletion

  • Higher amts. of UV rays reach the planet

  • Increased cases of skin cancers, cataracts, decreased immune systems

  • Decrease plant growth- crop damage and tall trees

  • Decreases phytoplankton populations (ocean productivity is reduced and fisheries are affected)

  • Reducing destruction

  • Eliminate uses of hydrocarbons/CFCs

  • Montreal Protocol


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