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OZONE

OZONE. What is ozone? Where is it found? Ozone depletion & regeneration. What is ozone?. An allotrope of oxygen It contains a coordinate covalent bond Is natural Is good & bad. Ozone Structure. Oxygen. Ozone. Triatomic molecule O 3 Contains double covalent bond + coordinate bond

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OZONE

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  1. OZONE What is ozone? Where is it found? Ozone depletion & regeneration

  2. What is ozone? An allotrope of oxygen It contains a coordinate covalent bond Is natural Is good & bad

  3. Ozone Structure

  4. Oxygen Ozone Triatomic molecule O3 Contains double covalent bond + coordinate bond Gas @ RTP Lethal to life • Diatomic molecule O2 • Contains double covalent bond • Gas @ RTP • Required for life Ozone & Oxygen

  5. Natural SPF

  6. Good Ozone Bad Ozone Good & Bad Ozone

  7. Ozone Holes Occur naturally Cosmic rays break apart O3 Regeneration also occurs naturally Seems to be temperature dependent

  8. Natural Depletion

  9. Oxygen Free Radicals This is an extremely unstable configuration, radicals quickly react with other molecules or radicals to achieve the stable configuration of 4 pairs of electrons in their outermost shell

  10. What are CFCs? CFC = chloro fluoro carbons Used as coolants for commercial &home refrigeration units, aerosol propellants, electronic cleaning solvents

  11. CFC Depletion

  12. Human activity puts chlorides and bromides into the atmosphere. Cold conditions are present in the Polar Regions that allow the accumulation of the CFC’s. Sunlight breaks down the CFC’s. Under certain conditions atomic chlorine forms and this has a major part in the breakdown of ozone. The breakdown products destroy ozone. The ozone is broken into oxygen molecules. No more Ozone protection in the stratosphere What we think happens

  13. Its a simple cycle

  14. CFCs Come From?

  15. Ozone Regeneration Oxygen molecule split by UV radiation Unstable Oxygen atom (radical) forms Atom joins with molecule to form ozone

  16. Monitoring Ozone Ground based methods Ozone sondes balloon-borne instruments Satellite data (Total Ozone mapping Spectrometer (TOMS) Solar Backscatter UV

  17. Finding a cure In the Montreal Protocol, 30 nations worldwide agreed to reduce usage of CFCs & encouraged other countries to do so as well

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