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What type of solids have regular geometric pattern?

  1. Jan 16, 2016 #1

    TT0

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    So there was this question:

    Which sample demonstrates particles arranged in a regular geometric pattern?

    A. CO2(g)
    B. CO2(s)
    C. CO2(l)
    D. CO2(aq)
    E. None of the above

    I chose E because I thought that covalent molecules, when solid, would be arranged in a random pattern, especially since this is a non-polar molecule. But apparently they will be arranged in a regular geometric pattern because the answer is B. So could someone confirm the answer and also tell me when solids have regular geometric pattern? Are there any rules?
     
  2. jcsd
  3. Jan 16, 2016 #2

    Bystander

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    "Amorphous" (without structure) solids have no regular pattern and can be recognized by lack of a sharp melting point.
     
  4. Jan 17, 2016 #3

    TT0

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    Ok, so is solid covalent molecules arranged in a regular geometric pattern?
     
  5. Jan 17, 2016 #4

    Borek

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    Staff: Mentor

    In most cases yes, covalent molecules on solidification will produce a crystal, with a regular pattern of molecules.
     
  6. Jan 17, 2016 #5

    TT0

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    Interesting, does this happen even with non-polar molecules?
     
  7. Jan 17, 2016 #6
    Probably all solids are crystalline at thermal equilibrium.
    There does not seem to be a mathematical proof, but there are no known exceptions.
     
  8. Jan 17, 2016 #7

    TT0

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    Ok thanks
     
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