Lect+14+Fall+2011 - 9/26/2011 1 Chapter 2: Protecting the...

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Unformatted text preview: 9/26/2011 1 Chapter 2: Protecting the Ozone Laye the Ozone Layer (continued) Sept. 28/2011 Annotated Bibliography, 30 pts • Due Mon. Oct. 3, 10 am via Turnitin (1/group) • 6 ‐ 8 sources (APA style + brief annotation) • http://citationmachine.net/ • What to include in annotation? (Pg.2) • Also include: names and group #, topic, and short description of how work will be split up, identify your lead source (*) 2 Review from Last Lecture • Radiation is viewed as bundles of energy λ hc = E • ABC’s of UV radiation • Role of O 2 & O 3 3 The largest % of energy from the sun comes to Earth in the form of… 1. Microwaves 2. Infrared radiation 3 Ultraviolet radiation 4 3. Ultraviolet radiation 4. X ‐ rays 5. Visible radiation 9/26/2011 2 Chlorofluorocarbons, CFCs • Composed of? • They do NOT occur in nature, they are artificially produced • Two of the most widely known – CFC ‐ 11 or CFC ‐ 12 • Dupont CFC ‐ 12 • Introduced in the 1930’s as a refrigerant, considered a triumph in chemistry • Replaced ammonia (NH 3 ) and sulfur dioxide (SO 2 ) which were toxic, corrosive, and hazardous • An ideal substitute: not poisonous, did not burn, very stable (revolutionized air ‐ conditioning, cheap, widely available) • Other uses: aerosol spray cans, certain solvents (oil and grease), sterilizer for surgical instruments 6 The Irony… • CFCs most ideal property (stability)...
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Lect+14+Fall+2011 - 9/26/2011 1 Chapter 2: Protecting the...

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