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6.3 Photochemical Smog Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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6.3 Photochemical Smog Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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6.3 Photochemical SmogPollution - ANS the addition of a substance or an agent to an environment by human activity, at
a rate greater than at which it can be rendered harmless by the environment, and which has an
appreciable effect on the organisms within it.
Primary Pollutant - ANS emitted directly from the polluting process. The process could be
natural or anthropogenic.
Secondary Pollutant - ANS primary pollutants undergo reactions with other chemicals in the
atmosphere
Primary Pollutants - ANS carbon monoxide, carbon dioxide, volatile organic compounds
(methane, ethane, alcohol) , particulate matter (black carbon/soot)
Secondary Pollutants - ANS -tropospheric ozone
-particulates produced from gaseous primary pollutants
-Peroxyacetyl Nitrate (PAN) - causes formation of Ozone
Formation of Secondary Pollutants - ANS -can be formed by photochemical reactions
-in the presence of sunlight, secondary pollutants are formed when primary pollutants undergo a
variety of reactions with other chemicals already present in the atmosphere.
Incomplete Combustion - ANS When combustion isn't completed, meaning that part of the
carbon isn't oxidized producing soot or carbon monoxide
HxCy + O2 ---> H2O + CO2 +CO+ C
Stratospheric Ozone - ANS protects us from harmful UV rays
Tropospheric Ozone - ANS some (higher) helps contribute to the greenhouse effect. Ground
ozone is harmful to living things.
Negative Effects of tropospheric ozone - ANS -oxidizing: ozone is a toxic gas and an oxidizing
agent (causes an extra O to attach)
-damage to plants: ozone absorbed into plants through leaves, degrades chlorophyll, reduces
photosynthesis therefore productivity)
-damage to humans: reduces action in lungs, increases susceptibility to infection, eye, throat
and nose irritation.
-damage to materials: attacks rubber, cellulose and some plastics, reduces life of car tires,
bleaches fabrics
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