Liquid To solid

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Name a substance that will change from liquid state to solid state on heating.
 

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And remaining chemically unchanged? Nothing does that.

You could have your ceramics which change from a liquid structure to a solid structure, but that's with the formation of bonds on heating and all that.
 
  • #3
tiny-tim
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eggy-weggy :biggrin:
 
  • #4
QuantumPion
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And remaining chemically unchanged? Nothing does that.

You could have your ceramics which change from a liquid structure to a solid structure, but that's with the formation of bonds on heating and all that.
The first thing that came to my mind was concrete, but that is a chemical reaction and doesn't really count.

Is it possible for some sort of solid solution to have a liquid phase at a lower temperature than a solid phase? E.g. one component of the solution precipitates out with increasing temperature while the other component turns to liquid?
 
  • #5
Mapes
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Is it possible for some sort of solid solution to have a liquid phase at a lower temperature than a solid phase?
It is possible, even for reversible transformations. It's only required that the high-temperature phase (the solid) has a higher entropy than the low-temperature phase (the liquid). As you can imagine, this is pretty unusual. I seem to remember that it's been demonstrated in some carefully designed polymer systems, though. Will look to see if I can find the details.
 
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Changes chemically :)
 
  • #9
Mapes
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It is possible, even for reversible transformations. It's only required that the high-temperature phase (the solid) has a higher entropy than the low-temperature phase (the liquid). As you can imagine, this is pretty unusual. I seem to remember that it's been demonstrated in some carefully designed polymer systems, though. Will look to see if I can find the details.
Ah, I found it: Plazanet et al., "Freezing on heating of liquid solutions," J Chem Phys 121:5031 p5031 (2004), discussed http://physicsworld.com/cws/article/news/20325" [Broken]. But a look at the subsequent literature indicates that the physics is still being worked out.
 
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QuantumPion
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Ah, I found it: Plazanet et al., "Freezing on heating of liquid solutions," J Chem Phys 121:5031 p5031 (2004), discussed http://physicsworld.com/cws/article/news/20325" [Broken]. But a look at the subsequent literature indicates that the physics is still being worked out.
Interesting, although it sounds like that is still just a chemical reaction, although notably a reversible one.
 
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  • #11
Mapes
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Interesting, although it sounds like that is still just a chemical reaction
Right, or put another way, a multi-component system (with additional factors such as mutual solubility) rather than a single-component system.
 

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