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photochemical smog - chemistry Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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photochemical smog - chemistry Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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photochemical smog - chemistrynatural formation of nitrous oxides - ANS - lightning
- volcanic activities
- bushfires
Anthropogenic formation of nitrous oxides - ANS - internal combustion engines
- jet engines
- industrial kilns and furnaces
Photochemical smog - ANS complex mixture of chemicals (primary and secondary pollutants)
usually formed in densely populated industrial areas
Primary pollutants - ANS output directly from the polluting source
Secondary pollutants - ANS formed from reactions between primary pollutants and other
molecules in the atmosphere, usually involve light and heat
high concentration of photochemical smog - ANS photochemical smog tends to form in densely
populated industrial areas and concentration of pollutants changes periodically across the day
sunlight - ANS many reactions for the formation of photochemical pollutants involve the
absorption of UV and heat
still air mass - ANS pollution may dispersed or displaced depending on prevailing weather
conditions
temperature inversion - ANS warm air containing pollutants tends to become trapped amongst
layers of cooler denser air
pollutants in photochemical smog - ANS non methane hydrocarbons, aldehydes, nitrous
oxides, ozone
main components and colour of photochemical smog - ANS the main components of
photochemical smog are nitrogen dioxide, nitrogen dioxide is responsible for the brown colour
associated with smog
biggest contributors of photochemical smog in urban areas are: - ANS motor vehicles where
many undesirable pollutants are emitted:
- VOCs ( volatile organic compounds)
- unburnt hydrocarbons
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