Chemistry 0620 · IGCSE · Formulae, functional groups and terminology

Formulae, functional groups and terminology — practice question

(a(i))[2]

Complete the chemical equation for ethanol formation by fermentation. $\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow \dots\dots\dots\text{C}_2\text{H}_5\text{OH} + \dots\dots\dots$

(a(ii))[2]

State two conditions needed for fermentation.

(b(i))[1]

Name a suitable catalyst for this reaction.

(b(ii))[2]

Calculate the maximum mass of ethanol that can be formed from 56 g of ethene.

(c(i))[1]

Name a suitable oxidising agent for this reaction.

(c(ii))[3]

Complete the dot-and-cross diagram so that the electron arrangement in ethanoic acid is shown. Show outer shell electrons only.

(d(i))[1]

When describing an acid, what does the term weak mean?

(d(ii))[3]

Describe how you could demonstrate that ethanoic acid is a weaker acid than hydrochloric acid.

(e)[4]

Draw the structures of the carboxylic acid and alcohol from which this ester can be formed. State the names of the carboxylic acid and the alcohol.

Worked solution & mark scheme

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