Fractional distillation of crude oil, hydrocarbons, combustion, cracking and pollutants.
Crude oil
A mixture of hydrocarbons (compounds of hydrogen and carbon only), separated by fractional distillation in a column with a temperature gradient: small molecules (low boiling point) rise to the top (e.g. refinery gases, petrol); large molecules stay at the bottom (e.g. bitumen).
As chain length increases: boiling point rises, viscosity increases, flammability decreases.
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