Lec7 Ozone III - Ozone Destruction III Chemistry in Context...

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Filters out ultraviolet radiation from the Sun Damage to respiratory system, etc. Ozone Destruction III Chemistry in Context Chapter 2
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Sept. 22, 2011 Wilmington News Journal delawareonline.com Bad Nearby…
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Sept. 23, 2011 Wilmington News Journal delawareonline.com Good Up High…
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Ozone Destruction is a Worldwide Problem Arosa, Switzerland
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Ozone “Hole” http://www.ozonelayer.noaa.gov/data/antarctic.htm
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Ozone Destruction is Greatest in Antarctica
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Questions 1. Why does the ozone concentration fluctuate so much with time and location? 2. Why is ozone destruction so extensive in the Antarctic? 3. What strategy has been adopted to mitigate ozone destruction?
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The Chapman Cycle (1) O 2 2O (UV-C radiation) (2) O + O 2 O 3 (3) O + O 3 2O 2 (4) O 3 O 2 + O (UV-B radiation) Ozone concentration increases/decreases with solar flux (step 1). Solar flux changes with latitude and time of year (example – maximum in summer in northern hemisphere). Solar flux varies on 12-year cycle (sun spots). Stratospheric winds (dilution). “Natural” mechanisms of ozone destruction examples: H 2 O + UV-C radiation H• + •OH (these decompose ozone) H 2 O concentration varies with thunderstorms, etc.; Volcanoes release HCl which can destroy ozone similar to CFCs
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Stratospheric Ozone Destruction Chlorofluorocarbon characteristics: 1. Efficient, nonreactive, nontoxic refrigerants and propellents 2. Photodissociate with UV-C radiation (not UV-A,B)
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This note was uploaded on 10/24/2011 for the course CHEM 100 taught by Professor Vanleer,m during the Spring '08 term at University of Delaware.

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Lec7 Ozone III - Ozone Destruction III Chemistry in Context...

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