Monday 22 April 2013

Q 1.3: Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, olyvinylchloride, fibre glass, copper.


Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, olyvinylchloride, fibre glass, copper.
Substance type of solid
Polyurethane     Amorphous solids
Nnaphthalene   Crystalline solids
benzoic acid     Crystalline solids
Teflon    Amorphous solids
Potassium nitrate Crystalline solids
Cellophane Amorphous solids
Polyvinylchloride  Amorphous solids
Fibre glass     Amorphous solids
Copper Crystalline solids
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10 comments:

  1. Unknown11 January 2015 at 19:17

    How do we know whether the given material is amorphous or crystalline? Could you please explain?

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    Replies
    1. Unknown30 March 2016 at 09:51

      All polymers are crystalline. All glass except quartz is amorphous . All molecular, ionic, covalent, metallic solids are crystalline. U can only classify with their property's. (i am not an admin. but a visitor)

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    2. Unknown24 April 2016 at 03:57

      Look up the differences between them...amorphous solids have no form... They consist of particles of irregular shape.. The definitions will make you clear-Laxmi satyam Sai sindhu karri

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    3. Unknown24 April 2016 at 03:57

      Look up the differences between them...amorphous solids have no form... They consist of particles of irregular shape.. The definitions will make you clear-Laxmi satyam Sai sindhu karri

      Delete
    4. Unknown28 February 2017 at 22:36

      All polymers are amorphous

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    5. PARTH17 July 2020 at 01:04

      Definite shape -crystalline solid Irregular shape-amorphous solid

      Delete
  2. Dangal Point23 April 2016 at 23:26

    Thanks Christo jose

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  3. Unknown6 November 2016 at 02:59

    Not all Polymers are Crystalline. PC, PVC, PS, ABS, PMMA and many others are Amorphous polymers.
    Crystalline polymers form crystalline structure during liquid to solid phase transition and amorphous polymers do not form such crystalline structure during the phase transition.

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  4. Unknown28 January 2017 at 06:14

    It also depends on how quickly the liquid was cooled into the solid. Crystalline nature is more specific than amorphous nature. Therefore, if a liquid gets more time to cool , the setting of the particles becomes more selective, i.e. a crystalline structure is obtained. There are a few exceptions to the cases which seem to be crystalline and are not or the other way round. for example quartz is the only crystalline glass. But for most cases it is better to remember one compound from each class and its structure. That will make your job a lot easier

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  5. san thomas20 February 2017 at 21:48

    Thanks to all

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