reducing air pollution

Question 1

describe the liming process

Answer 1

lakes which have been affected by acid rain is psprayed with powdered limestone or chalk (calcium carbonate) to neutralise the acid in the water

Question 2

how does catalytic converters work

Answer 2

inside the catalytic converters, there are transition metals like platinum and rhodium which converts poisonous gases into harmless ones.

Question 3

hot exhaust gases become…

Answer 3

CO2 H2O N2

Question 4

carbon monoxide is oxidised to carbon dioxide

Answer 4

2CO + O2 > 2CO2

Question 5

nitrogen oxide reduced to nitrogen

Answer 5

2NO + 2CO > N2 + 2CO2

Question 6

why doesn’t the catalytic converter solve all pollution problems

Answer 6

the catalytic converters change CO to CO2 which is still a greenhouse gas

Question 7

what is another name for waste gas

Answer 7

flue gas

Question 8

two ways to minimise the effects of sulfur dioxide pollution

Answer 8

1. remove first- remove sulfur from ff before burning. lowers the amount of sulfur dioxide released into the atmosphere. (too expensive and difficult)
2. flue gas desulfurisation
   remove from waste gases formed when fossil fuels undergo combustion(cheaper)—-spray calcium carbonate or chalk ( calcium oxide) onto the flue gas to produce CO2 and air

Question 9

explain flue gas desulfurisation + equation of sulfur dioxide react with calcium carbonate to form calcium sulfite

Answer 9

CaCO3 + SO2 > CaSO3 + CO2

Question 10

equation of calcium sulfite further oxidised to calcium sulfate

Answer 10

2CaSO3 + O2 > 2CaSO4