National 4 Chemistry- Unit 2- Fuels

What is a fuel?

• A substance found naturally occurring in the environment

• A substance which takes in energy when burned

• A substance which gives out energy when burned

• A substance which is used as a starting material to make petrol and diesel

What are the products of COMPLETE combustion? Choose all that apply.

• Hydrocarbons

• Oxygen

• Carbon dioxide

• Water

What are the possible products of INCOMPLETE combustion? Choose all that apply.

• Carbon monoxide

• Water

• Carbon dioxide

• Carbon

Combustion reactions give out heat energy. What term do we give these types of reactions?

• Exothermic reactions

• Endothermic reactions

Which of the following are fossil fuels? Select all that apply.

• Coal

• Wood

• Oil

• Gas

Fossil fuels are classed as finite sources of energy. This means...

• They will eventually run out

• They are renewable

• They are good for the environment

• They are found naturally occurring in the environment

Which gas is produced when coal burns?

• Oxygen

• Nitrogen dioxide

• Sulphur dioxide

• Water vapour

Which of the following processes release carbon dioxide into the atmosphere? Choose all that apply

• Burning of fossil fuels

• Decomposition

• Photosynthesis

• Respiration of plants and animals

Which of the following fuels are renewable sources of energy? Choose all that apply

• Diesel

• Biofuel

• Coal

• Hydrogen

Which of the following fuels is the least harmful to the environment?

• Diesel

• Petrol

• Wood

• Biofuel