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Ozone Depletion

Ozone Depletion. E.4.1:. When ODS substances reach the ozone layer the UV rays from the sun break them down and release molecules that destroy the ozone molecules. E.4.1:. E.4.1:. CFCl3 + UV Light ==> CFCl2 + Cl Cl + O3 ==> ClO + O2 ClO + O ==> Cl + O2

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Ozone Depletion

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  1. Ozone Depletion

  2. E.4.1: • When ODS substances reach the ozone layer the UV rays from the sun break them down and release molecules that destroy the ozone molecules.

  3. E.4.1:

  4. E.4.1: • CFCl3 + UV Light ==> CFCl2 + ClCl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • The free chlorine atom is then free to attack another ozone molecule • Cl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • and again ... • Cl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • and again... for thousands of times.

  5. E.4.1 • http://www.bom.gov.au/lam/Students_Teachers/ozanim/ozoanim.shtml

  6. E.4.2: • Examples of Ozone Depleting Substances arechlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl bromide, carbon tetrachloride, and methyl chloroform.

  7. E.4.2:

  8. E.4.3: • Chlorofluorocarbons (CFCs) are compounds containing chlorine, fluorine and carbon. CFCs have many uses such as aerosoland refrigerants.

  9. E.4.3: • In order to replace CFCs attempts have been made to develop compounds that have less ozone depleting potential(ODP). • Hydrochloroflourocarbons -Although they break down more quickly in the atmosphere, and have less potential for destroying the ozone they could still damage it if they are overused. • Hydrofluorocarbons-They have no chlorine and therefore won’t break down ozone molecules however, their toxicity is unsafe. • Hydrocarbons-They are cheap and won’t damage the ozone however they are poisonous and flammable.

  10. Fin.

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