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Edexcel IGCSE Chemistry carboxylic acids

Practise carboxylic-acid questions by identifying COOH groups, completing reactions and calculating formula information from Mr data.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Circle or draw the COOH group in displayed or structural formulae of acids.
  • Complete equations for carboxylic acids reacting with magnesium or sodium carbonate.
  • Calculate chain length or formula information from Mr, CH2 units and atom counts.

Covered syllabus points

4.34C Carboxylic acid functional group4.35C Carboxylic acid structures and names4.36C Carboxylic acid reactions4.37C Vinegar and ethanoic acid

(f) Carboxylic acids question 1

[Maximum number: 1]

This question is about alcohols, carboxylic acids and esters.

Aspirin is a compound used to reduce pain．
Aspirin contains a carboxylic acid functional group and an ester functional group．

This is the structural formula of aspirin.

Figure for Question (f) Carboxylic acids question 1 — Edexcel IGCSE Chemistry

Draw a circle around the carboxylic acid functional group.

(f) Carboxylic acids question 2

[Maximum number: 4]

Some cars in Brazil use ethanol, C2H5OH\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}, as a fuel instead of petrol.
The ethanol is made by the fermentation of glucose which is obtained from sugar cane.
The sugar is extracted from the sugar cane and then dissolved in water to make a sugar solution.

Question (a)

(a)

When ethanol is heated with acidified potassium dichromate(VI), it is oxidised to ethanoic acid.

[ 4 ]

Question (i)

(i)

The structural formula of ethanoic acid is CH3COOH\mathrm{CH}_{3} \mathrm{COOH}

Draw the displayed formula of ethanoic acid.

[ 2 ]

Question (ii)

(ii)

Complete the equation for the reaction of ethanoic acid with sodium.

............ CHX3COOH(aq)\ce{CH3COOH(aq)} + ............ Na(s)\ce{Na(s)} -> ................................ (aq) + ................................ (g)

[ 2 ]
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