What type of solids have regular geometric pattern?

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  • #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?
 

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  • #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.
 
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  • #3
TT0
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Ok, so is solid covalent molecules arranged in a regular geometric pattern?
 
  • #4
Borek
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Ok, so is solid covalent molecules arranged in a regular geometric pattern?
In most cases yes, covalent molecules on solidification will produce a crystal, with a regular pattern of molecules.
 
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  • #5
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Interesting, does this happen even with non-polar molecules?
 
  • #6
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Interesting, does this happen even with non-polar molecules?
Probably all solids are crystalline at thermal equilibrium.
There does not seem to be a mathematical proof, but there are no known exceptions.
 
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  • #7
TT0
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Ok thanks
 

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