Reactions of alkenes and polymers

• How would you describe the combustion of alkenes?

  Incomplete combustion with a smoky flame.
• State three substances Alkenes can react with.

  Hydrogen, water and halogens
• Why are alkenes reactions called addition reactions?

  The atoms add across the C=C double bond which becomes a C-C single bond.
• Write a general word equation for addition of hydrogen to an alkene.

  Alkene + hydrogen --> Alkane
• Write a general word equation for addition of steam to an alkene.

  Alkene + water --> Alcohol
• Write a general word equation for addition of chlorine to an alkene.

  Alkene + chlorine --> Dichloroalkane
• What conditions are necessary in the reaction of alkenes with hydrogen?

  60°C, Nickel catalyst
• What conditions are necessary for the reaction of alkenes with steam?

  High temperature, high pressure, catalyst
• What is the name of the type of polymerisation involving alkenes?

  Addition polymerisation
• Describe addition polymerisation. 


  Many small monomers join together to form very large molecules called polymers. The C=C double bond becomes a C-C single bond.
• Describe how a monomer is drawn in a reaction.

  All atoms and bonds shown around the C=C double bond with little n on the left.
• Describe how a polymer is drawn in a reaction. 


  All atoms and bonds shown around the C-C single bond with bonds through the brackets and little n on the right.