Chemistry 0620 · IGCSE · Formulae, functional groups and terminology

Formulae, functional groups and terminology — practice question

A number of organic compounds, including alcohols, carboxylic acids and esters, are made up only of carbon, hydrogen and oxygen.
(a)[2]

Calculate the empirical formula for compound R.

(b)[2]

Calculate the molecular formula for compound S.

(c(i))[1]

What name is given to compounds that have the same molecular formula but different structures?

(c(ii))[2]

Draw the structures of compounds T and V, making sure every atom and every bond is shown.

(c(iii))[2]

Complete the equation for this reaction: \(\text{C}_3\text{H}_6\text{O}_2 + \ldots \rightarrow \ldots + \ldots\)

(d(i))[1]

Give the name of the homologous series that compound W belongs to.

(d(ii))[1]

Draw the structure of compound W, showing every atom and every bond.

(e(i))[2]

What does the term hydrocarbon mean?

(e(ii))[2]

State the general formulae of: alkanes; alkenes.

(f)[5]

Describe the two-stage production of ethanol from the long-chain alkane octane, \(\text{C}_8\text{H}_{18}\). Include: the names of the kinds of chemical reactions involved, reaction equations, reaction conditions.

Worked solution & mark scheme

This 20-mark question has a full step-by-step worked solution and mark scheme. One marking point: calculation of the ratio that gives the empirical formula

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