Chemistry 0620 · IGCSE · Alkenes

Alkenes — practice question

Ethene, $\text{C}_2\text{H}_4$, is the first member of a set of closely related compounds that possesses the alkene functional group.
(a)[1]

State the name of the family of similar compounds that all contain the same functional group.

(b)[1]

Find the difference in relative molecular mass between $\text{C}_2\text{H}_4$ and the next compound in this family of closely related compounds.

(c)[2]

Write the balanced symbol equation for the complete combustion of $\text{C}_2\text{H}_4$.

(d(i))[4]

Complete Table 6.1 to show how the concentration of $\text{C}_2\text{H}_4(g)$ is affected, if at all, when each change in conditions is made. Use only increases, decreases or no change.

(d(ii))[3]

Explain, using collision theory, why the rate of the forward reaction rises when the temperature increases.

(e(i))[1]

Deduce the molecular formula for compound B.

(e(ii))[1]

State why compound B is unsaturated.

(e(iii))[2]

Draw one repeat unit of the polymer made when compound B undergoes addition polymerisation.

(e(iv))[1]

Explain why 1 mol of compound B reacts with 2 mol of sodium hydroxide, NaOH.

(e(v))[2]

Calculate the volume, in $\text{cm}^3$, of $0.250\text{ mol/dm}^3$ NaOH needed to react with $0.100$ mol of compound B.

Worked solution & mark scheme

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