Friday 5th September
TODAY WE ARE
LEARNING ABOUT
 Why are some plastics hard and others flexible?
TODAY'S
KEY WORDS ARE
  • P_lym_r
  • M_n_m_r
  • C_v_l_nt
  • D_ns_ty
  • _th_n_
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    Memory Anchor:

    YOU WILL SHOW
    YOUR LEARNING BY...

    • Super Challenge:

      Stretch:

      Challenge:

    Key Questions:

    1. What is a polymer?
      • A polymer is a large chain of monomers covalently bonded.
    2. What factors determine the type of polymers that are made?
      • The properties of polymers depend on what monomers they are made from and the conditions under which they are made. For example, low density (LD) and high density (HD) poly(ethene) are produced from ethene.
    3. What is the difference between thermo softening and thermosetting polymers?
      • Thermosoftening polymers melt when they are heated. Thermosetting polymers do not melt when they are heated.
    4. How are high density and low density poly(ethene) are produced from ethene?
      • High and Low density poly(ethene) are made using different catalysts and different reaction conditions.
    5. How are the structures of thermosoftening and thermosetting polymers different?
      • Thermosoftening polymers are no cross chains or branches between the polymer chains so slide easily past each other, this makes them change shape when heated. Thermosetting polymers have many cross chains or branches so are able to hold their sh