Chemistry 0620 · IGCSE · Alkenes

Alkenes — practice question

Alkanes and alkenes form two homologous series within hydrocarbons.
(a(i))[1]

What is the meaning of the term hydrocarbon?

(a(ii))[2]

State the general formula of the homologous series of alkanes, alkenes?

(a(iii))[2]

Besides the general formula, state two features of a homologous series.

(a(iv))[1]

Draw a different alkene molecule that also has the molecular formula C$_4$H$_8$. Include every atom and every bond.

(a(v))[1]

What term is used for molecules with the same molecular formula but different structural formulae?

(b(i))[1]

What does the phrase excess of oxygen mean?

(b(ii))[1]

What volume of oxygen took part in the reaction with the hydrocarbon? ................. cm$^3$

(b(iii))[1]

Fill in the table to give the simplest whole-number ratio of volumes.

(b(iv))[2]

Use your answer from (b)(iii) to complete the balancing of the chemical equation. Deduce the formula of the hydrocarbon. C$_x$H$_y$(g) + ......O$_2$(g) $\rightarrow$ ......CO$_2$(g) + ......H$_2$O(l) formula of the hydrocarbon = ....................

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Substances made up of only carbon and hydrogen

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