CAIE IGCSE Chemistry 11.4.2 Properties of Alkanes As Being Questions

Work through real CAIE IGCSE Chemistry questions to write combustion equations, identify alkane reactions and compare energy released by fuels.

Exam points

write balanced complete-combustion equations giving carbon dioxide and water as products
write or choose incomplete-combustion equations that produce carbon monoxide or carbon when oxygen is limited
choose correct statements about alkanes burning in oxygen while lacking C=C bonds and undergoing substitution with chlorine
link larger hydrocarbon molecules to greater energy released on combustion

[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

$/^{\circ} \mathrm{C}$

boiling point

$/^{\circ} \mathrm{C}$

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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