plastics

• plastics are made by joining together many small units called monomers to make larger molecules called polymers
• making polymers by joining monomers together is called polymerisation
• monomers are small molecules containing a carbon to carbon double bond
• polymers are a long chain molecules made by joining together many monomers
• monomers must have a H shape
• addition polymerisation is the reaction where unsaturated monomers are joined to form a polymer
• when drawing a polymer ;

  1- draw the monomer 3 times

  2- remove the double bond giving the carbon free bonds to join

  3- join the molecules together
• polymer chains are repetitive the sections that repeat themselves are called repeating units
• to name an addition polymer from a monomer just put - poly Infront of the monomer. eg poly-propene
• to calculate the percentage of a molecule present in a compound - GFM of element ÷ GFM of compound x 100