:tada: Fractional Distillation- (EXPLANATION) - exam question :tada: Crude oil passes through a furnace where the oil is heated then alkanes as a gas when reaching their boiling point before condensing back in a liquid again once it has reached its fraction. Fractions at the top of the chain have lower boiling points for example refinery gas. While fractions at the bottom of the chain have very high boiling points and are likely to be more viscous for example bitumen (4 marks)
