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Ozone

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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  1. 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

  2. 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

  3. 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

  4. 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.

  5. 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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