chem unit 3B +C

• plastics are examples of


  polymers2 multiple choice options
• polymers are long chains made by joining together of many small molecules called

  monomers (unsaturated)
• monomers joining together

  addition polymerisation
• polymerisation involves breaking the


  c-c double bond to join monomers together
• how to name polymers

  add poly in front of name. eg poly(ethene)
• all plants need 3 essential elements to grow=

  N.P.K nitrogen , phosphorous, potassium
• fertilsers must be.... to be taken up by roots of plants

  soluble in water
• Haber proccess. making...

  ammonia
• raw materials haber proccess

  nitrogen and hydrogen
• conditions haber process

  - high pressure (200atm)

  - mod high temp (450 degree)

  -iron catalyst chamber(to lower temp)
• HAIR

  haber

  ammonia

  iron catalyst

  reversible
• properties ammonia

  pungent smell. disolves in water to give alkaline solution, used in production of fertlisers.
• ostwald proccess. makes

  nitric acid
• raw materials ostwald process

  -ammonia from haber

  -o2 from air
• open.

  ostwald

  platnum catalyst

  exothermic(so only need to heat at start)

  nitric acid
• ammonia (base)+nitric acid=ammonium nitrate

  NH3 + HNO3 + MH4NO3