Air (4N Science(chemistry)

What is the volume of oxygen in 50 cm³ of air?

• 1 cm³

• 10 cm³

• 40 cm³

• 50 cm³

A steel factory and a chemical factory are near to a city. The limestone buildings in the city begin to crumble.

Which gas causes this damage?

• carbon dioxide

• carbon monoxide

• oxygen

• sulfur dioxide

Air is a mixture of gases. Which gas is present in the greatest amount in air?

• carbon dioxide

• hydrogen

• nitrogen

• oxygen

Car exhaust fumes are a mixture of substances. Which substance(s) in the fumes is not harmful to health?

• carbon monoxide

• nitrogen oxides

• sulfur dioxides

• water vapour

Statement 1: The burning of fossil fuels containing sulfur is a cause of ‘acid rain’.

Statement 2: Acid rain is formed from sulfur dioxide which is produced when sulfur compounds burn.

• Both statements are correct and statement 2 explains statement 1.

• Both statements are correct but statement 2 does not explain statement 1.

• Statement 1 is correct but statement 2 is incorrect.

• Statement 2 is correct but statement 1 is incorrect.

120 cm³ sample of air is trapped in a syringe. The air is slowly passed over heated copper in a tube until there is no further decrease in volume. A black solid forms on the surface of the copper.

What volume of gas remains in the syringe?

• 24 cm³

• 42 cm³

• 78 cm³

• 96 cm³

The table gives information about the percentage composition of four samples of air.

Which sample was from somebody breathing out into a plastic bag?

• nitrogen-76 % ; oxygen- 21 % ; carbon dioxide-1.10 %

• nitrogen-77 % ; oxygen- 21 % ; carbon dioxide-0.11 %

• nitrogen-78 % ; oxygen- 16 % ; carbon dioxide- 4 %

• nitrogen-78 % ; oxygen- 20 % ; carbon dioxide-0.03 %

Some processes that produce pollutants are

1 combustion of fossil fuels

2 lightning activity

3 volcanic eruptions

Which of these processes may produce sulfur dioxide?

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

• 1, 2 and 3

Some processes that produce pollutants are

1 lightning activity

2 volcanic eruptions

3 combustion in the car engine

Which of these processes may produce oxides of nitrogen?

• 1 only

• 1 and 3 only

• 2 and 3 only

• 1, 2 and 3

Which statements about pollutants are correct?

1 Carbon monoxide is responsible for the production of ‘acid rain’.

2 Oxides of nitrogen are present in car exhausts.

3 Sulfur dioxide can be produced by the combustion of fossil fuels.

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only