process separates the many hydrocarbons in crude oil into useful mixtures.
Hydrocarbons that are separated include refinery gas which is used for gas
cookers, and paraffin used for aircraft fuel Properties of fractions at the top: Low boiling point
Burn with a clear flame
Are smaller molecules Properties of fractions at the bottom: Have a high melting point
Are darker in colour
Less likely to burn
Are larger molecules
These hydrocarbons have a high boiling point and have longer carbon chains.