Crude oil is heated before it enters a fractionating column.
Explain why the crude oil is heated before it enters the column.
The fraction with the lowest boiling point is collected at the top of the column. Explain why.
Fractional distillation is a physical process. Give one reason why fractional distillation is a physical process and not a chemical reaction.
40 exam-style questions on AQA GCSE Chemistry 7.1 Carbon compounds as fuels and feedstock, covering 7.1.1 Crude oil, hydrocarbons and alkanes, 7.1.2 Fractional distillation and petrochemicals, 7.1.3 Properties of hydrocarbons, and 7.1.4 Cracking and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.