CAIE IGCSE Chemistry 11.3.3 Hydrocarbons Are Compounds That Questions

Work through real CAIE IGCSE Chemistry questions to define hydrocarbons and classify fuels by checking whether carbon and hydrogen are the only elements present.

Exam points

state that a hydrocarbon contains carbon and hydrogen atoms only
explain why ethanol or another oxygen-containing compound is not a hydrocarbon
classify fuel formulae or combustion examples by checking whether any element other than carbon and hydrogen is present

[Maximum number: 1]

Some properties of four fuels are shown.
Which fuel is a gas at room temperature and makes two products when it burns in a plentiful supply of air?

fuel

formula

melting point
$1{ }^{\circ} \mathrm{C}$

boiling point
$1{ }^{\circ} \mathrm{C}$

hydrogen

$\mathrm{H}_{2}$

-259

-253

methane

$\mathrm{CH}_{4}$

-182

-164

octane

$\mathrm{C}_{8} \mathrm{H}_{18}$

-57

126

wax

$\mathrm{C}_{31} \mathrm{H}_{64}$

400

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CAIE IGCSE Chemistry 11.3.3 Hydrocarbons Are Compounds That Questions question 1