Composition of air
nitrogen- 78%
oxygen - 21%
other gases- 1% ---> carbon dioxide-0.03%---> noble gases - mainly argon.
NOTE: AIR DOES NOT CONTAIN HYDROGEN!!!!!!!
POLLUTANTS
For pollutants, pupils are expected to be able to least 2 pollutants: its sources, effects and solutions. (Questions on air have become very popular in examinations)
CARBON MONOXIDE
Source: incomplete combustion of fuels in vehicle engines
Solution:
1) ensure complete combustion of fuels
2) attach catalytic converter to vehicle engines.
OXIDES OF NITROGEN
Source:
1) combustion of fuel in vehicle engines at high temperature
2) lighting
Solution:
Fit catalytic converter to vehicle engines.
ACID RAIN
1) when sulphur dioxide dissolves in rain, sulphuric acid is formed.
2) when oxides of nitrogen dissolves in rain, nitric acid is formed.
(1) + (2) --- > ACID RAIN
Effects Of Acid Rain:
(1) Corrode buildings,
(2) corrode limestone structures,
(3) damage to trees and
(4) marine lives.
