N5 CHEM: FUELS AND HYDROCARBONS

Fuel:

A substance that can be burned to produce energy

Combustion:

An exothermic reactionwhere a fuel burns in the presence of oxygen releasing early

Examples of fossil fuels:

Coal, crude oil, natural gas

Products when fuel burns:

Carbon dioxide

Water (vapour)

Chemical test for water:

Cobalt chloride paper turns from blue to pink

Chemical test for carbon dioxide:

Turns limewater cloudy

Chemical test for oxygen:

Relights a glowing splint

Chemical test of hydrogen

Burns with a squeaky pop

Complete combustion:

A substance burns in a plentiful supply of oxygen; carbon dioxide and water is always produced

Incomplete combustion:

Occurs when oxygen supply is poor; water, carbon, and carbon monoxide is produced

Hydrocarbon:

Compound made up of hydrogen and carbon atoms only