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Edexcel IGCSE Chemistry G Esters Questions

Practise naming, drawing and preparing esters from alcohols and carboxylic acids, including formulae, catalysts, smells and uses.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • draw displayed ester structures with the -COO- linkage and the correct carbon chains
  • deduce the alcohol and carboxylic acid from an ester name or displayed formula
  • apply ester preparation details

Covered syllabus points

4.38C Ester functional group4.39C Formation of ethyl ethanoate4.40C Ethyl ethanoate structures4.41C Ester structures and names4.42C Properties and uses of esters4.43C Ester preparation practical

Question 1

[Maximum number: 3]

Gaseous ethanol is manufactured by reacting ethene gas with steam.

This is the equation for the reaction.

Question (a)

(a)

Ethanoic acid reacts with ethanol to form ester A and water.

[ 3 ]

Question (i)

(i)

Complete the equation by adding the displayed formula of ester A.

Figure for Question (i) — Edexcel IGCSE Chemistry
[ 2 ]

Question (ii)

(ii)

Give the name of ester A.

[ 1 ]

Question 2

[Maximum number: 7]

This question is about alcohols, carboxylic acids and esters.

Question (a)

(a)

Ethanol can be manufactured by the fermentation of a solution of glucose.

[ 4 ]

Question (i)

(i)

Write a word equation for this reaction.

[ 1 ]

Question (ii)

(ii)

State the substance that needs to be added for the reaction to occur.

[ 1 ]

Question (iii)

(iii)

State two conditions needed for this reaction.

1
2

[ 2 ]

Question (b)

(b)

In the presence of an acid catalyst, ethanoic acid is heated with butanol to form an ester.

[ 3 ]

Question (i)

(i)

Which of these is the formula of the ester?

A

CH3COOC3H7\mathrm{CH}_{3} \mathrm{COOC}_{3} \mathrm{H}_{7}

B

CH3COOC4H9\mathrm{CH}_{3} \mathrm{COOC}_{4} \mathrm{H}_{9}

C

C2H5COOC4H9\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COOC}_{4} \mathrm{H}_{9}

D

C3H7COOC2H5\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{COOC}_{2} \mathrm{H}_{5}

[ 1 ]

Question (ii)

(ii)

State how you would know that an ester has formed.

[ 1 ]

Question (iii)

(iii)

Give one use of an ester.

[ 1 ]
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