air

Question 1

composition of air

Answer 1

78% nitrogen
21% oxygen
0.97% noble gas
0.03% carbon dioxide

Question 2

carbon monoxide

Answer 2

produced from incomplete combustion
toxic and colourless
combines with haemoglobin to form carboxyhaemoglobin which prevents transport of oxygen

Question 3

oxide of nitrogen

Answer 3

formed when nitrogen and oxygen react in a high temperature eg. combustion and by lightning
react with rain water to form acid rain which can harm aquatic life and destroy building
cause breathing difficulty

Question 4

sulfur dioxide

Answer 4

produced during volcanic eruption and combustion of fossil fuels
can causes respiratory problems
react with water to form acid rain which destroy metal structure of building and harms aquatic life

Question 5

unburnt hydrocarbon

Answer 5

incomplete combustion of fuels
can cause cancer