· The smaller a hydrocarbon the more useful it is.
· The smaller chain of hydrocarbon has a lower boiling point.
· The smaller chain of hydrocarbon is more runny. It isn’t as viscous as the longer chains of hydrocarbon.
· The smaller chain of hydrocarbon is more flammable.
· At room temperature, small hydrocarbons are gases, the ones in with between five or twelve carbon atoms are liquids, and large hydrocarbons are solids.
· We separate crude oil into fractions using fractional distillation.
· It is fed into a tall tower (fractionating tower) as hot vapour. The tower is kept very hot at the bottom and much cooler at the top, so the temperature decreases going up the column. The gases in the column condense when they reach their boiling points, and the different fractions are collected at different levels.
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