Chemical Forums
Specialty Chemistry Forums => Other Sciences Question Forum => Topic started by: vulcan2.0 on July 10, 2004, 03:01:44 PM
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I want to know if it is possible to mix a gas like hydrogen with a metal like titanium. I think you could by using electrolisis. Also, my teacher told me about a theory that says that when you compress hydrogen enough it will become a metal. Is this theory plausible?
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Hydrogen can exist as a metal, although i think its only metastable at room temperature, it's basically formed by having a core of liquid H in the middle of a long sealed tube, with two anvils either side that are blasted together with a HE charge.
I have always wanted a chunk of hydrogen metal, it would be such a fun element to play with, I also read somewhere that hydrogen forms two isotopes above tritium, H4 and H5 ;D
And yes titanium can form hydrides of course, some metals like palladium and other platinug group metals can absorb H without forming actual compounds, maybe titanium could to some extent although i am not sure.
Hope this helps.
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I think you may have allotropes and isotopes confused there. Simple pressure and temperature changes aren't going to cause the nucleus of an atom to change. (Unless it is MASSIVE pressure and temperature changes, in which case fusion may occur). If an element is cooled and/or pressurized to extremes, then the possibility of a new allotrope forming is possible. (See graphite -> diamond).
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Matallic hydrogen is an abstract concept. Scientist found experimentally that under high pressure and temperature hydrogen caoud conduct electrical current in the way as metals did.
But some metals easily dissolve hydrogen (eg. palladium). Hydrogen can also diffuse into solid metals because of small size om hydrogen molecules.
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I thought you could make an exta-light metal that would be fairly stable. I thought this could be done by fusing a metal with hydrogen or helium. Is this possible??? ??? ??? : :evil: :evil: :evil:
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I think its mostly impossible to connect helium with anything, correct me if I'm wrong guys. Its so tiny and simple, with a full valence, its not going to want to react with anything.
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Helium is what you would call a completely inert substance. I am not aware of any research which has resulted in Helium forming a compound with anything. While fluorine gas will combine with some of the noble gasses under the right circumstances, helium is not a part of that group.
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The only thing I know of that you can get helium to combine with, is itself. Not too sure about that, maybe I'm thinking of neutron heavy helium instead...
But anyway, the fancy pants versions of helium is what supposedly is going to be used for fusion in the 'future'. I learned a lot about helium from doing google searches on fusion.
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I think when you said that helium can combine with itself you were thinking of nitrogen, and the isotope of helium you were talking about is deuterium, an isotope of hydrogen. The product of hydrogen fusion is helium and that’s probably where you got mixed up. ;)
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yeah thats it, I knew I had something backwards. But isn't one of the byproducts 3He?
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I know that the byproduct of hydrogen fusion is helium but I don’t know what isotope it is if that’s what you mean.
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Yeah thats what I meant, isotope. After the deuterium fuses, you have a helium atom with one extra neutron. Thats why (I guess) its 3He. But since each deuterium atom has an extra neutron, there's one extra after the fusion. Where does it go? Off to smack into something else and repeat the process. At least I think thats how its supposed to work. Sounds similar to fission to me, as far as the chain reaction part of it.
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Neutrons cause stuff to fission, so its the heat released with the fusion that makes the chain reaction go.
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Actually, if two Deuterium atoms fuse, you'd get:
H2 + H2 = He4
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From what I've read of fusion reactions, what supposedly happens is:
2H + 2H --> 3He + an extra neutron
And I'm pretty sure its that extra neutron is what helps speed up the rest of the fusion reaction. Keep feeding it deuterium and it'll keep fusing. A much better reactant is tritium, but thats hard to make. Have to some crazy stuff to lithium to get it.
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No, I'm sure a neutron hitting an atom won’t speed up fusion, your thinking of fission. When U-235 splits it releases 3 neutrons that split other atoms, that’s why its fissionable because of the chain reaction.
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Ah ha, found something that explains my point a little bit better:
http://www.fusion.org.uk/info/reaction.htm
there is an extra neutron, but since it doesn't split anything, I'm not too sure what its good for.
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Thats H2 + H3 = He4 + a neutron
Not
H2 + H2 = He3 + a neutron
I guess it can release an extra neutron but not with two deuterium atoms, only with a deuterium and a tritium atom.
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now i see about helium but what about hydrogen ??? can u combine it with a metal
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to create a extra light metal that is somewhat stable.
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now i see about helium but what about hydrogen ??? can u combine it with a metal
Absolutely not. Think about what you're saying. ;D If you combine a pound of lead with a quarter pound of feathers, will you make something that weighs less than a pound? Nope. Combining two things does not make something lighter. The law of conservation of mass prevents that from happening. Also, if you "combine" hydrogen with a metal, you will no longer have a metal. Instead you'll wind up with a hydride. Ionic salts are not very strong, and most hydrides that I know of are quite soluble in water.
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Tritium doesn't seem too difficult to prepare, it's deuterium that has me stumped, as I cannot be fussing about electrolysing hundreds of liters of water for a tiny bit of D2O :o
Tritium can be prepared by bombarding 6Li with, I think, neutrons, I think natural Li is about 25% 6Li ;D
Hmmm...this sounds like making tritium in ooohhh say a coke bottle?
3He is also produced, but these could be seperated easily be combining the tritium with oxygen to make T2O ;D
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The only way to get Deuterium is to isolate it from water/hydrogen gas. It cannot be "made" very easily at all, and it's actually a lot easier to just extract it from water. VERY time consuming, but pretty much the only way to do it.
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you need to centrifuge a water sample several times to get at the deuterium.
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I thought that Helium dimers had been observed at extremely low T. I seem to recall calculating the bond length for these in my quantum mech. class and it was something absurd like 55 ang. Anyway, I thought that they had observed the vibrational spectra of 3He-4He dimers....
I might be wrong though, and I don't have my notes from that class anymore.