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What is a fraction
A mixture of compounds with similar boiling points
How are fractions seperated in crude oil
Fractional distillation

Fractionating column

What is cracking
Long chain hydrocarbons are broken into smaller more useful ones
What are the two types of cracking and the conditions required
Thermal cracking - high temp and pressure produces mainly alkanes and alkenes
Catalytic cracking- lower temp and slight pressure, zeolite catalyst produces mainly aromatic compounds.