Chemistry 0620 · IGCSE · Fuels

Fuels — practice question

Molecules of compound A occur in some plants. Fig. 4.1 presents the displayed formula for one molecule of compound A.
(a)[1]

Deduce the molecular formula of compound A so that the numbers of carbon, hydrogen and oxygen atoms are shown.

(b)[1]

On Fig. 4.1, circle one section of the molecule that is responsible for decolourising aqueous bromine.

(c)[2]

Complete Table 4.1 to calculate the relative molecular mass of C10H16O2.

(d)[1]

Name one additional fossil fuel.

(e(i))[1]

Using only the fractions shown in Fig. 4.2, name the fraction that contains compounds with the longest chain length.

(e(ii))[1]

Using only the fractions shown in Fig. 4.2, name the fraction that contains compounds with the highest volatility.

(e(iii))[1]

Using only the fractions shown in Fig. 4.2, name the fraction used for home heating systems.

(f(i))[1]

Identify the unsaturated hydrocarbon in Table 4.2.

(f(ii))[1]

Explain your answer in f(i).

(g(i))[1]

Identify this other product.

(g(ii))[1]

State one adverse effect to the environment of the production of carbon dioxide.

(h(i))[2]

Draw the displayed formula for ethanol. Show every atom and every bond.

(h(ii))[3]

Ethanol can be manufactured from ethene and one other reactant. Name the other reactant, and state the temperature and pressure used.

Worked solution & mark scheme

This 17-mark question has a full step-by-step worked solution and mark scheme. One marking point: $C_{10}H_{18}O$

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