answer pollution - DECEMBER 2014 QUESTION 1 a Water H2O...

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DECEMBER 2014 QUESTION 1 a) Water, H 2 O Carbon Dioxide, CO 2 Methane, CH 4 N 2 O Chlorofluorocarbon, CFC b) CO 2 c) Gradually increase temperature of earth lower atmosphere due to the increase of greenhouse gasses d) Primary pollution Secondary pollution Difference Directly emitted from the source Different primary pollutants react one another to form secondary pollutant Example Sulphur Dioxide, SO 2 Nitrogen Oxide, NO 2 , Carbon monoxide, CO Volatile Organic Compound Peroxyacylnitrates, PAN Ozone, O 3 Formaldehyde NO 3 - and SO 4 2- salts e) Production of Hydroxyl HCHO + hv HCO. + H. H. + O 2 HO 2 HO 2 + NO NO 2 + OH. O 3 + hv O 2 + O. O. + H 2 O 2OH. Production HCHO + .OH HCO + H 2 O HCO + O 2 HO 2 + CO CH 4 + .OH CH 3 + H 2 O CH 3 + O 2 + M CH 3 O 2 + M QUESTION 2 a) Troposphere Stratosphere b) Stratosphere – ozone protect the dangerous UV light from reaching the earth Troposphere – ozone can harm the crop production, forestry growth and human health c) Ozone depletion potential is a measure ability of a compound to destroy stratospheric layer.
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