Fractional distillation is used to ____ To carry this out, a ____ has to be used. The hydrocarbons are separated out based on their ____ as this determines their ____ and boiling point due to the strength of the ____ forces. Longer molecules have ____ intermolecular forces, so require more ____ to break them down and therefore have a ____ melting and ____ point. Shorter molecules, on the other hand have ____

Melting and boiling point of hydrocarbons

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