Air iGCSE

Clean dry air contains mainly nitrogen and oxygen.

 Name two other gases that are in clean dry air.

• Nitrogen

• carbon dioxide

• carbon dioxide an nitrogen

• nitrogen and sulfur dioxide

Air often contains pollutants. Identify three common gaseous pollutants in air and state how each of these pollutants are

produced.

1.Carbon ​ ​ (a)   from​ (b)   combustion

2.​ ​ (c)   dioxide from burning fossil fuels

​ 3. oxides of​ (d)   from nitrogen reacting with​ (e)   in car engines

• monoxide
• incomplete
• sulfur
• nitrogen
• oxygen

How oxides of nitrogen, such as nitrogen dioxide, are formed in car engines?​ ​ ​

• oxygen reacts with nitrogen at high temperature

• nitrogen monoxide reacts with oxygen

• oxygen reacts with nitrogen

• nitrogen monoxide reacts with oxygen at high temperature

Describe how carbon dioxide and carbon monoxide are formed in motor vehicle engines.

Carbon monoxide is formed by ​ (a)   combustion

Carbon dioxide is formed by​ (b)   combustion

• incomplete
• complete

What forms when nitrogen monoxide is released into the atmosphere?

• It reacts with oxygen: NO +1/2O2 -> NO2

• It reacts with oxygen: 2NO + O2 -> N2+ O2

• It reacts with water vapours to form acid rain

Predict the possible adverse effect on the environment when this non-metal oxide, NO2, reacts with water and oxygen

• it forms acid rain

• it reacts with oxygen to form nitrogen oxide

• it reacts with oxygen to form nitrogen

How are the amounts of carbon monoxide and nitrogen monoxide emitted by modern motor vehicles reduced? Include an equation in your answer.

• use of catalytic convertors

  2NO+2CO→2CO +N2

• use of catalytic convertors

  2NO+2CO→2CO2 +N2

Carbon monoxide is a...

• greenhouse gas

• toxic gas

• produces acid rain

Particulates are also named soot or...

• dust

• carbon

Particulates are dangerous to humans because...

• produce fog

• produce respiratory problems or cancer

• produce acid rain