06-03-2003 09:50									#1
	Dumb chemistry question Support Apolyton, buy Alpha Centauri

Please don't laugh. This week I have lots of work so I am operating on 5 hours of sleep a night, so I don't remember stuff that should be obvious to me.

Calcium carbonate is a gas, right?

	06-03-2003 09:53									#2
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Isn't that cave deposit?

Just a guess

	06-03-2003 09:54									#3
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Gas? No...

	06-03-2003 09:57									#4
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It's limestone.

	06-03-2003 09:57									#5
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Solid then.
edit: that was in response to Asher. I'm still not that stupid.

	06-03-2003 10:26									#6
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just make up your mind and have one babe as ur avatar!

	06-03-2003 10:49									#7
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At room temperature, it is a solid. If you heat it up to 2000K or so it is a gas

	06-03-2003 12:19									#8
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the calcium bit should be a tip off to what it is

	06-03-2003 14:04									#9
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I can't think of a calcium compound that is gasous at STP.

	06-03-2003 15:31									#10
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That's because there isn't one

	06-03-2003 16:35									#11
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Nitpick mode:

Calcium carbonate cannot be vaporised by heating it. It breaks up long before that, releasing CO2 and becoming calcium oxide (quicklime).

...Which has the useful property of reacting strongly with water to produce calcium hydroxide (slaked lime) and a good deal of heat. It's used in some survival kits, to heat soup. A self-heating can has a compartment containing quicklime and a water container that's opened when you pull a tab.

Don't try mixing it into the soup itself, slaked lime is a somewhat toxic alkali.

	06-03-2003 16:39									#12
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quote: Originally posted by Jack the Bodiless Don't try mixing it into the soup itself, slaked lime is a somewhat toxic alkali.

Yum, I want to line my intestine with chalk

	06-03-2003 16:41									#13
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Useful tip of the day: quicklime is also good for dissolving corpses.

	06-03-2003 16:42									#14
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quote: Originally posted by Jack the Bodiless Useful tip of the day: quicklime is also good for dissolving corpses.

I thought they used it to preserve corpses?

	06-03-2003 16:46									#15
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quote: Originally posted by Urban Ranger I thought they used it to preserve corpses?

No, they used to throw a shovelful of quicklime into the grave with the bodies of people who died of some diseases (typhoid, cholera) to speed up decomposition and to reduce any risk of contamination.

	06-03-2003 16:51									#16
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I suppose it would work as a drying agent if placed in a coffin.

But, if a corpse is actually buried in the stuff, it would react with the water in the flesh, and the resultant alkali helps to dissolve more of the flesh into the quicklime (and the heat could also boil out more of the water).

	06-03-2003 17:08									#17
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quote: Calcium carbonate cannot be vaporised by heating it. It breaks up long before that, releasing CO2 and becoming calcium oxide (quicklime).

oooh, good point!