Which of the following is a potential source of pollutants?

• car exhaust fumes

• industrial smoke

• power station emissions

• volcanoes

• plants

Answer explanation

Car exhaust fumes, industrial smoke, power station emissions and volcanoes emit pollutants into the atmosphere.

Which pollutant does complete combustion release into the atmosphere?

• carbon monoxide

• carbon particulates

• carbon dioxide

Answer explanation

Carbon dioxide is a pollutant produced during complete combustion.

When a fuel combusts, which gas from the air does it react with?

Answer explanation

When a fuel combusts, it reacts with oxygen gas.

Which of the following pollutants are produced during the incomplete combustion of hydrocarbon fuels?

• carbon monoxide

• carbon particulates

• carbon dioxide

Answer explanation

Carbon monoxide and carbon particulates are both pollutants produced during the incomplete combustion of fuels.

If a fuel containing sulfur reacts with oxygen, which of the following is a possible product?

• nitrogen dioxide

• sulfur dioxide

• phosphorus dioxide

Answer explanation

If a fuel containing sulfur reacts with oxygen then sulfur dioxide will be produced.

What is the name given to a chemical that speeds up the rate of a reaction without being used up itself?

Answer explanation

A catalyst is a chemical that speeds up the rate of a reaction without being used up itself.