the origins and environmental implications of pollutants in car exhaust gases francesca lewis acid...
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The Origins and Environmental Implications of Pollutants in Car
Exhaust Gases
Francesca LewisAcid RainSmog masks
Photochemical smog
Origins
Many of the chemicals we
will look at
Environmental Implications
Many harmful effects including damage to
humans, materials and crops
A brown coloration that obscures the sky with a yellow haze that lowers the visibility. This drives away tourists from coming.
Unburnt hydrocarbons (CxHy)
From unburnt fuel
Careless workers
Diesel engines
Contributes to photochemical smog
Flammable substances in air
Cancer
Origin Environmental Implications
CxHy + (x + y/4) O2 xCO2 + (y/2) H2OCxHy + (2x + y/4) O2 xCO + (y/2) H2O
Carbon Monoxide CO(g)
From incomplete combustion
Cars and other vehicles
Contributes to smog
Death
Origin Environmental Implications
O2 + 2 C → 2 CO
H2O + C → H2 + CO
Complete Combustion
Particulates (C)
From incomplete combustion
Plants, factories and diesel engines
Smoke
Nausea, difficulty breathing, lung cancer and cardiovascular
illnesses
Reduce photosynthesis
Origin Environmental Implications
Carbon dioxide
Origins
From combustion of hydrocarbons in petrol
Environmental implications
Greenhouse effect
Nitrogen oxides NOx
Origins
• Lightning
• Combustion of nitrogen and oxygen in air when spark is passed in car engine
Environmental implications
• Toxic to humans, contributes to photochemical smog, acid rain, damage to ozone layer
N2 + O2 = 2NO2NO + O2 =2NO2
Sulfur oxides
Origins
• Combustion of Sulfur or Sulfur compounds in petrol
Environmental implications
• Toxic to humans
• Damages plants
• Acid rain
S + O2 SO2
2SO2 + O2 2SO3