GCSE Chemistry C2

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Author:
ghoran
ID:
143600
Filename:
GCSE Chemistry C2
Updated:
2012-03-25 04:39:32
Tags:
structure bonding polymers
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Description:
revision
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  1. .... betweeen moleceules determine the ..... of plastics
    • forces
    • properties
  2. ...... ...... bonds hold the atoms together in ...... .... . but it's the .... between ..... .... chains that determine the properties of plastic
    • strong covalent
    • long chains
    • bonds
    • different molecule
  3. some individual tangles chains of polymers , held together by weak intermolecular forces , are free to ...... over each other .these polymers are ......... polymers because they dont have ......-.... between chains . the forces between chains are really .... to overcome , so it's dead .... to ..... plastic . when it cools , the polymer hardens into a new shape . You can melt these plastics and ...... them as many times as you like
    • slide
    • thermosoftening
    • cross-linking
    • easy
    • melt
    • remould
  4. some plastics have strong intermolecular forces between the polymer chains , called .....-... , that hold the chains .... together . These are called ...... polymers , they have cross-links , these hold the chains together in a solid structure . theses polymers dont .... when they're ..... . thermosetting polymers are .... , .... and ....
    • cross-links
    • firmly
    • thermosetting
    • soften
    • heated
    • hard , strong ans rigid
  5. ..... polymers with different ..... and uses can also be made from the same ..... . this is done by changing the ..... ... when the polymer is made .
    • different
    • properties
    • monomer
    • reaction conditions
  6. Low density polyethene (LDPE) is made by heating ..... to about ..... degrees centigrade under ..... pressure . Its ..... and is used for ... and ....
    • ethene
    • 200
    • high
    • felxible
    • bags
    • bottles
  7. High density polyethene (HDPE) is made at a .... temperature and .... (with a .....) . it's more .... and is used for ... ... and .....
    • lower
    • pressure
    • catalyst
    • rigid
    • water tanks
    • drainpipes

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