Chemistry C1 5.2 Making polymers from alkenes.

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What are plastics made from?
Very large molecules called polymers.
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What are polymers?
Large molecules made when many small molecules (monomers) join together.
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What can be used to make polymers such as poly(ethene) and poly(propene)?
Alkenes.
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What happens to the bonds when a polymer is formed?
Double bonds in the monomer become single bonds in the polymer when the molecules have joined.
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What are the small molecules used to make polymers called?
Monomers.
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What is the reaction to make a polymer called?
Polymerisation.
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What can lots of ethene (C_(2)H_(4)) join together to form?
Poly(ethene), commonly called polythene.
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What happens in the polymerisation reaction of ethene?
Each ethene molecule becomes a single bond and thousands of ethene molecules join together in long chains.
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What happens to the bonds in the monomer when a polymer is formed?
Double bonds in the monomer become single bonds in the polymer when the molecules have jointed together.
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How do other alkenes polymerise in relation to ethene?
Other alkenes can polymerise in a similar way, for example, propene (C_(3)H_(6)) can form poly(propene).
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What are made from alkenes?
Many of the plastics we use as bags, bottles, containers and toys.
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How are polymers made?
From many small molecules or monomers that react or join together or polymerise to make very large or very long molecule.
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How many monomers are there in a poly(ethene) molecule?
Thousands or a very large number.
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Why can we make polymers from alkenes but not from alkanes?
Alkenes are more reactive or are unsaturated or have a double bond, alkanes are unreactive or saturated or do not have a double bond.
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**LEARN TO RECOGNISE MONOMERS AND POLYMERS FROM DIAGRAMS***
**YOU SHOULD BE ABLE TO DRAW THE STRUCTURE OF THE POLYMER MADE FROM A GIVEN MONOMER**
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Card 2

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What are polymers?

Back

Large molecules made when many small molecules (monomers) join together.

Card 3

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What can be used to make polymers such as poly(ethene) and poly(propene)?

Back

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Card 4

Front

What happens to the bonds when a polymer is formed?

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Card 5

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What are the small molecules used to make polymers called?

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