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February 25 notes air pollution (test 3)

February 25 notes air pollution (test 3) - Acid rain...

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CHE 1405 with Hassell Chemistry February 25, 2008- Test 3 notes Air Pollution Air composition: o nitrogen, N 2 78% of air o oxygen O 2 21%, o Argon Ar .93%, o Carbon Dioxide CO 2 .03% o Everything else .04% (gasoline fumes, pollution, other noble gases) o Usually water vapor 0-5% depending on humidity Table 12.2 the seven major air pollutants – put in notes! Major air pollutants o Primary Carbon monoxide CO- from motor vehicles, poisonous Hydrocarbon CH x - from motor vehicles, industry, solvents Sulfur Oxides SO x - from power plants, coal S+O 2 SO 2, 2SO 2 +O 2 2SO 3 Nitrogen Oxides NO x - from power plants, motor vehicles, N 2 +O 2 (flame) 2NO, 2NO+O 2 2NO 2 Particulates- from industry, power plants, fly ash, soot, dust, smoke Lead- from motor vehicles, burned leaded gasoline (now illegal) o Secondary- formed by reactions of the primary pollutants
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Unformatted text preview: Acid rain- industry SO x , NO x , SO 3 +H 2 O H 2 SO 4 , NO 2 +H 2 O HNO 3 Photochemical oxidants • Ozone- O 2 +sunlight • PAN- from sunlight, hydrocarbons, nitrogen oxides (motor vehicles and sunlight) • Smog- smoke + fog o London smog- sulfur oxides particulates; carbon monoxides in cool, humid air; made from coal fires London smog Similar to pittsburg or donora, penn. o Los Angeles smog- photochemical smog; nitrogen oxides, carbon monoxides, CH x , and sunlight to make oxidizing agents (cars + sunlight) • If wind scatters pollution, the local effect is not bad, but if a temperature (atmosphere) inversion occurs, the pollution collects and is dangerous (figure 12.4)...
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