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Liquid To solid

by sam013024
Tags: liquid, solid
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sam013024
#1
Apr28-11, 08:41 AM
P: 1
Name a substance that will change from liquid state to solid state on heating.
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Bloodthunder
#2
Apr28-11, 08:51 AM
P: 174
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.
tiny-tim
#3
Apr28-11, 09:02 AM
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eggy-weggy

QuantumPion
#4
Apr28-11, 09:04 AM
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Liquid To solid

Quote Quote by Bloodthunder View Post
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?
Mapes
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Apr28-11, 08:55 PM
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Quote Quote by QuantumPion View Post
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.
DaveC426913
#6
Apr28-11, 09:06 PM
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Quote Quote by tiny-tim View Post
eggy-weggy
You read my mind.
Bloodthunder
#7
Apr29-11, 02:32 AM
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Changes chemically :)
Andy Resnick
#8
Apr29-11, 08:27 AM
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eggy-weggy
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Mapes
#9
May2-11, 10:09 AM
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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 here. But a look at the subsequent literature indicates that the physics is still being worked out.
QuantumPion
#10
May2-11, 10:30 AM
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Quote Quote by Mapes View Post
Ah, I found it: Plazanet et al., "Freezing on heating of liquid solutions," J Chem Phys 121:5031 p5031 (2004), discussed here. 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.
Mapes
#11
May2-11, 10:40 AM
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Quote Quote by QuantumPion View Post
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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