How the physical properties of hydrocarbons change with molecule size

1 mark · Easy

State one physical property that changes as the number of carbon atoms in a hydrocarbon increases.

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Boiling point increases

Also accept: Viscosity increases; Volatility decreases; Hydrocarbons become darker in colour; Hydrocarbons burn less easily

Common mistakes: Boiling point decreases

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Marking points

B1 · 1 mark · States any correct property that changes as hydrocarbon chain length increases (e.g., boiling point, viscosity, volatility, colour, ease of burning).

Worked solution

For example, as the number of carbon atoms increases, the boiling point of the hydrocarbon increases.