CAIE IGCSE Chemistry 11.3 Fuels Questions

Practise interpreting fuels, hydrocarbons and petroleum fractions using tables, refinery diagrams and combustion evidence.

Exam points

interpret refinery diagrams to order petroleum fractions by chain length and position
link fuel properties and complete combustion products to methane and other hydrocarbons

Covered syllabus points

11.3.1—Fossil fuels: coal, natural gas and 11.3.2—Methane as the main constituent of 11.3.3—Hydrocarbons are compounds that 11.3.4—Petroleum is a mixture of hydrocarbons 11.3.5—Separation of petroleum into useful 11.3.6—Petroleum fraction trends up the 11.3.7—Fraction uses: refinery gas for

[Maximum number: 1]

The pie chart represents the composition of natural gas.
Which sector represents methane?

Figure for Question 1 — CAIE IGCSE Chemistry

sector A

sector B

sector C

sector D

[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

[Maximum number: 1]

Petroleum is an important fossil fuel.
Which row correctly describes petroleum?

type of substance

composition

compound

mainly hydrocarbons

compound

only hydrogen and carbon

mixture

mainly hydrocarbons

mixture

only hydrogen and carbon

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Covered syllabus points

Question 1

Question 2

Question 3