Chemistry 0620 · IGCSE · Alkanes

Alkanes — practice question

Citronellol occurs in rose oil, and its structure is shown here.
(a)[1]

On the displayed structure, circle the alcohol functional group.

(b)[1]

How many hydrogen atoms are present in a single molecule of citronellol?

(c)[1]

Which feature in the structure of citronellol indicates that it is unsaturated?

(d(i))[1]

Describe how the density of the liquid alkanes changes as the number of carbon atoms in one molecule increases.

(d(ii))[1]

Predict the boiling point you would expect for propane.

(d(iii))[1]

Why is it hard to predict the melting point of butane from the table information?

(d(iv))[2]

What state is pentane in at $30\,^{\circ}\text{C}$? Explain your answer.

(d(v))[2]

Alkanes are hydrocarbons. What does the term hydrocarbon mean?

(d(vi))[1]

Draw the structure of ethane. Make sure that every atom and every bond is shown.

(d(vii))[2]

Complete the chemical equation for the combustion of propane. $\text{C}_3\text{H}_8 +$ ......$\text{O}_2 \rightarrow$ ......$\text{CO}_2 + 4\text{H}_2\text{O}$

Worked solution & mark scheme

This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: a circle drawn round the OH group

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