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8 2011
Bugsy77
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Bugsy77
65 posts
Nomad

Hey

We were doing molecules, Ionic compunds, Covalent compounds and their structures and stuff...then wee came across a Covalent Compunt- Covalent Network Structure...which makes the melting and Boiling points extrememly high...

This substance was Diamond...

Now if youve actually thought about...it! The Solid is clearly a clear Sold....So if you go to melt this Clear solid?

What Colour will it be? Will it be a certein colour, Due to the Carbon and Hydrogen? Or will it be Clear like the actual Stone?
But if it were to be clear...this means it is almost like BOILING,BOILING, BOILING HOT WATER..(talking about the Colour?)

  • 8 Replies
Vixen
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Vixen
52 posts
Nomad

I think it would still be clear, or at least white-ish. But at that temperature the boiling diamond liquid would probably be impossible to really look at from the intense heat, fire, and melted stuff around it. But either way I'd assume it'd be the same color. Not sure; I'm not a qualified chemist or anything.

Strop
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Strop
10,816 posts
Bard

Melting diamond is difficult- if I recall at normal atmospheric pressures it's in the ballpark of 3500C or so. That's because as an almost entirely covalent carbon crystal, it's really stable.

There is another way to "melt" diamond though. You'll have to alter the conditions by using superhigh pressures, and apparently it becomes a puddle.

But if you think about it, normally carbon based substances sublimate, not liquefy, so those would have to be some crazy high pressures!

nichodemus
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nichodemus
14,991 posts
Grand Duke

apparently it becomes a puddle.


Usually it won't turn into a liquid state. A scientist (Lavoisier?) heated a diamond before. Poof! It disappeared in a puff of smoke. Diamond is an allotrope of carbon, meaning that it is a form of carbon, just like graphite, another allotrope.
DDX
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DDX
3,562 posts
Nomad

It should turn out a darker puddle because liquid carbon is just black... and nasty. Hypothetically speaking, ofcourse and using common sense.

nichodemus
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nichodemus
14,991 posts
Grand Duke

crazy high pressures!


Diamonds can also be made that way...industrially. But the tiny stones that result can't be used for jewellery, just industrial cutting. And dentists use them for their drills. No wonder they hurt so much!
Pixie214
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Pixie214
5,837 posts
Peasant

Try This Out!


Ok who's gonna volunteer to rob a jewlery shop and melt down the biggest diamond they get. I would go get the crown jewels but they're down south. (serioulsy don;t melt your mums best necklace down, please)

I have to agree with DDX's logic that it would get darker since its carbon based though chemistry is my worst science.
DDX
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DDX
3,562 posts
Nomad

what we need is... our trusty phase diagram!

http://www.teachersparadise.com/ency/en/media/d/dc/phase_diag.png

I have to agree with DDX's logic that it would get darker since its carbon based though chemistry is my worst science.

love orgo-chem


Diamonds can also be made that way...industrially.

yup according to my phase diagram it is possible


But hypothetically if you raise the temperature enough and raise the pressure along with it. The diamond my be liquefied. (probably some several thousand miles under the earth).
Bugsy77
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Bugsy77
65 posts
Nomad

[quote]Diamond is an allotrope of carbon, meaning that it is a form of carbon, just like graphite, another allotrope.

What is exactly is an "allotrope" care to explain anyone?

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