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Odd One Out. Think of these molecules they all have something in common but one is slightly different. Rubber. DNA. Polyethene. Protein. Polythene is a man made polymer. Polymers!. What are polymers?.

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odd one out
Odd One Out
  • Think of these molecules they all have something in common but one is slightly different





Polythene is a man made polymer

what are polymers
What are polymers?

Polymers are very large molecules made when hundreds of monomers join together to form long chains.

The word ‘polymer’ comes from the Greek words poly (meaning ‘many’) and meros(meaning ‘parts’).

Plastics are synthetic polymers that can be shaped by heat or pressure.

what keeps the chain together

covalent bond

What keeps the chain together?

The monomers in a polymer are joined together by covalent bonds between atoms.

In a covalent bond, each atom shares one or more electron with another atom. The bonds are sometimes shown as sticks.

addition polymerization

addition polymerization


Addition polymerization

Polyethene (sometimes called polythene) is a polymer made from ethene.

The process by which polyethene and other polymers is made is called addition polymerization(Adding ethenes together


time to get up and try polymerization
Time to get up and try polymerization

6 Volunteers front and center

Now everyone up lets have a go!!!!

polymer chains
Polymer Chains
  • Cut out the monomer in front of you
  • Fold round till bonds with no atoms on come together this will be your double bond!
  • Break the double and join your atom to the person sat next to you’s one. And glue
  • Find another table with the same monomer as your table and join to their chain and so on…….
drawing polymers shorthand formulae
Drawing polymers – shorthand formulae

Polymers contain thousands of molecules, so how can their structures be easily drawn?

Part of the polymer molecule can be drawn:

A better way is to show a shorthandformula:

The ‘n’ means that the polymer contains a very large number of the repeating unit shown in the brackets.

what s the polymer


What’s the polymer?

What is the shorthand formula for polypropene?

The monomer is propene (C3H6):

which canbe drawn as:

1. Draw two C atoms that were in the double bond with a single covalent bond.

2. Draw the brackets and the ‘n’.

3. Add the links outside the brackets.

4. Add the atoms that were attached to each C atom of the double bond.

try and name the polymer
Try and name the polymer
  • Ethene
  • Propene
  • Styrene
  • Vinyl Chloride
  • Ethene terephthalate