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Organic compounds all contain carbon.

Organic Chemistry 3

Revise GCSE Organic Chemistry polymers: learn how alkenes form long chains, how repeating units work, and how properties link to structure. Read the notes, then try the quiz below.

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Fascinating Fact:

Addition polymerisation happens when many alkene molecules join together to make a polymer. The double bond opens up and forms single bonds to link the repeating units.

In GCSE Chemistry, Organic Chemistry 3 often introduces polymers and how they are made from alkenes. You will learn to recognise repeating units, write simple polymer structures, and explain how different polymers are used in everyday life.

Key Terms

Monomer: A small molecule that can join to others to form a polymer.
Polymer: A very large molecule made from many repeating monomer units.
Repeating unit: The section of a polymer chain that shows the pattern repeated throughout the molecule.

Frequently Asked Questions (Click to see answers)

What is a polymer in GCSE Chemistry?

A polymer is a large molecule made from lots of smaller molecules joined together in a chain. The small molecules are called monomers, and the pattern is shown by a repeating unit.

How do you work out the repeating unit of an addition polymer?

Start with the alkene monomer, then change the carbon-carbon double bond into a single bond. Keep the atoms attached to each carbon the same, and show the unit in brackets with bonds continuing on both sides.

Why do different polymers have different properties?

Polymers have different properties because their chains can be arranged and linked in different ways. This affects how easily chains slide, how strong the material is, and how flexible or rigid it feels.

Try These Related Quizzes

Click on any image to see a larger image.

1 .

What type of organic compound is shown in the diagram?

Alkane

Alkene

Ester

Carboxylic acid

Carbon and hydrogen only and only single C-C bonds

2 .

What type of organic compound is shown in the diagram?

Alkane

Alcohol

Carboxylic acid

Ester

The -COOH gives you the answer here

3 .

The picture shows a molecule of an organic compound, paracetamol. What is its molecular formula?

C₈H₉NO₂

C₈H₈NO₂

C₆H₉NO₂

C₈H₉NO

Count up the number of each atom in the molecule

4 .

This diagram shows a molecule of aspirin. What is its molecular formula?

C₉H₈O₃

C₈H₉O₄

C₉H₈O₄

C₉H₇O₄

Can you spot the the carboxylic functional group in this molecule?

5 .

What type of organic compound is shown in the diagram?

Alkane

Alcohol

Carboxylic acid

Ester

The carbon chains of the original acid and alcohol are linked by one of the oxygen atoms

6 .

Name the compound shown in the diagram.

Butane

Butene

Butanol

Propene

4 carbons tells you that the name must begin with the prefix 'but' and the the double bond shows you that it is an alkene

7 .

Name the compound shown in the diagram.

Butane

Butene

Butanol

Propanol

The -OH group tells you it is an alcohol and the 4 carbon atoms give you the prefix 'but'

8 .

Name the compound shown in the diagram.

Pentane

Pentanoic acid

Pentanol

Butanoic acid

Pent (= 5 carbons) plus the COOH functional group leads you to the correct answer

9 .

Name the compound shown in the diagram.

Ethyl propanoate

Propyl ethanoate

Methyl propanoate

Ethyl butanoate

This has an odour that resembles pineapples

10 .

Name the ester produced when the compound in the diagram is reacted with ethanol.

Butyl methanoate

Pentyl ethanoate

Ethyl pentanoate

Methyl butanoate

The alcohol gives you the first part of the name of an ester, the second part comes from the name of the original carboxylic acid

Author: Kate Gardiner (Chemistry Educator & GCSE Quiz Writer)

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