Organic Chemistry (OCR Gateway GCSE Chemistry: Combined Science)

Heptane is an alkane with seven carbons.

What is the chemical formula of heptane?

The complete combustion of pentane, C₅H₁₂, takes place in the following unbalanced equation:

_C₅H₁₂   +   _O₂ →   _CO₂   +  _H₂O

What numbers will balance the reaction?

Which of the following molecules is an alkene?

Which molecule can be cracked to produce hexane, C₆H₁₄?

Crude oil is a mixture of hydrocarbons.

Crude oil is separated into useful fractions.

Which of these mixtures of substances could be in a fraction from crude oil?

Crude oil is separated into fractions by fractional distillation.

Look at the diagram of the fractions made in fractional distillation.

Which of these fractions has the lowest boiling point?

The bar chart shows the amount of some fractions made from 100 tonnes of crude oil by fractional distillation.

It also shows the amount of each fraction needed for everyday uses.

Cracking converts large molecules into smaller more useful molecules to make the supply match the demand.

Which fractions are most likely to be cracked to make the supply match the demand?

What is the general formula of the fractions produced by the fractional distillation of crude oil?

Crude oil is separated into fractions by fractional distillation.

Look at the diagram of the fractions made in fractional distillation

Which of these fractions has the strongest intermolecular forces?

Which fraction is collected at the top of the fractional distillation column?