Chemistry 0620 · IGCSE · Alkanes

Alkanes — practice question

Ethane, propane and butane belong to one homologous series.
(a(i))[1]

Name the homologous series to which these compounds belong.

(a(ii))[2]

State two similarities between members of the same homologous series.

(b)[1]

Calculate the number of molecules present in 15 g of ethane.

(c(i))[1]

Write the formula of the product that contains no carbon.

(c(ii))[1]

Draw the structure of one organic product formed. Show every atom and every bond.

(c(iii))[1]

State the name of this reaction type.

(d(i))[2]

Give the colour change that is observed.

(d(ii))[1]

Explain, in terms of bonding, why adding aqueous bromine to ethane causes no colour change.

(e(i))[2]

Draw the structures of both of these isomers, showing every atom and every bond.

(e(ii))[1]

Complete the chemical equation to show the other product when butane is formed by cracking. $\text{C}_6\text{H}_{14} \rightarrow \text{C}_4\text{H}_{10} + \ldots$

(f(i))[2]

Calculate the empirical formula of this compound. Show your working.

(f(ii))[1]

Calculate the molecular formula for this compound.

Worked solution & mark scheme

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