Burning hydrocarbons | Starter Quiz | Oak National Academy

When wood burns it reacts with which gas?

• carbon dioxide

• water vapour

• oxygen

• nitrogen

Answer explanation

When wood and other fuels burn they react with oxygen gas.

When a fuel containing carbon is burnt which gas will be produced?

• nitrogen

• oxygen

• argon

• carbon dioxide

Answer explanation

Carbon in the fuel reacts with oxygen as the fuel burns to produce carbon dioxide.

What is a chemical test for carbon dioxide?

• bubble through limewater and it will turn cloudy

• place a glowing splint in the gas and it will relight

• white anhydrous copper sulfate crystals will turn blue

Answer explanation

The test for carbon dioxide is to bubble the gas through limewater making it turn cloudy.

What is the scientific name for burning?

• respiration

• photosynthesis

• combustion

• precipitation

Answer explanation

Combustion (burning) is an exothermic process where a substance reacts with oxygen.

Which of the following are examples of fossil fuels?

• crude oil

• nuclear fuel

• natural gas

• coal

Answer explanation

Crude oil, natural gas and coal are all examples of fossil fuels.

Match the scientific key terms with the correct definition

• conservation of mass

• the total mass of reactants equals the total mass of products formed

• exothermic reactions

• fuels made over millions of years from dead plants and animals

• hydrocarbons

• chemical reactions in which thermal energy is given out

• fossil fuels

• molecules made of hydrogen and carbon atoms only

Answer explanation

Hydrocarbons are molecules made of hydrogen and carbon atoms only. Conservation of mass describes how the total mass of reactants equals the total mass of products formed. Exothermic reactions give out thermal energy.