Crude oil is separated by fractional distillation.
Why does a fraction containing larger molecules have a higher boiling point?
Larger molecules have stronger covalent bonds between their atoms.
There are stronger intermolecular forces between larger molecules.
Larger molecules have more covalent bonds that must be broken.
Larger molecules react more slowly with oxygen when heated.
63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.