Chemistry 0620 · IGCSE · Alkanes

Alkanes — practice question

This question concerns alkanes and petroleum fractions.
(a(i))[1]

Describe how the boiling points of the alkanes change as the number of carbon atoms in each molecule changes.

(a(ii))[1]

Name the alkane with the lowest melting point.

(a(iii))[1]

Deduce the physical state of butane at $-50^\circ\text{C}$. Explain why.

(b(i))[1]

Complete the dot-and-cross diagram so that it shows the electron arrangement in a methane molecule. Show only outer shell electrons.

(b(ii))[2]

Complete the word equation for methane’s complete combustion. methane + oxygen → [BLANK] + [BLANK]

(c)[3]

Methane and ethane are [BLANK] that are members of the same homologous series. Compounds in the alkane homologous series show similar [BLANK] properties because they contain the same [BLANK] group.

(d)[2]

Match the fractions on the left to the uses on the right. The first match has already been completed for you.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: rises as the number of carbon atoms rises / falls as the number of carbon atoms falls

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