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Author: Subject: Most extreme compounds known to man
Fusionfire
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 Quote: Originally posted by Mr. Wizard Mono atomic Hydrogen combining to form H2. The reaction of H + H =H2 +422 kJ energy is more powerful than any other chemical reaction per unit mass. Some work has been done studying small amounts of H monatomic gas at very low (< 1K) temperatures and using a strong magnetic field. The gas has been used in Atomic hydrogen welding, but is generated at the tips of Tungsten electrodes in an arc, and only lasts until it strikes the cooler surfaces of the 'work', where it combines to produce it's prodigious energy. As a comparison 2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ (286 kJ/mol) which weighs 36 grams per Mole of product, or 18 times as heavy. http://en.wikipedia.org/wiki/Hydrogen http://www.weldingarticle.com/atomic-hydrogen-welding/atomic... and 'cough' ;-) http://www.lateralscience.co.uk/AtomicH/atomicH.html http://www.science.uva.nl/research/quant/sph.html

Very interesting. Anyone have this pdf about atomic hydrogen?

http://pubs.acs.org/doi/pdf/10.1021/ja01392a011
rstar
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I think the strongest base is n-Butyllithium

eh... don't laugh...
..I might be wrong !!

"A tidy laboratory means a lazy chemist "
- Jöns Jacob Berzelius
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 Quote: Originally posted by rstar I think the strongest base is n-Butyllithium

Rest In Pieces!
turd
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 Quote: Originally posted by Methyl.Magic The organotellurium have the palm of the most putrid compound. Chemistry of telluride cannot be really investigated because chemists wouldnt work with this element anymore since they lost their wife and their friends because when some telluride compound are in the body they slowly diffuses a stroug garlic odour out of the skin that can lasts up to one year according to some source I've forgotten...

That's mostly old wives' tales. Yes they're bad, but not that bad. The body gets rid of Te compounds quite easily (easier than Se).
rstar
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 Quote: Originally posted by rstar I think the strongest base is n-Butyllithium

n-hexylcesium and n-heptylfrancium ?

"A tidy laboratory means a lazy chemist "
- Jöns Jacob Berzelius
AirCowPeaCock
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n-octylununennium?

[Edited on 1-26-2012 by AirCowPeaCock]

# BOLD

GreenD
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TROLL
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 Quote: Originally posted by GreenD TROLL

"Ja, Kalzium, das ist alles!" -Otto Loewi
Mr. Wizard
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Fusionfire, I hadn't seen that interesting pdf about atomic hydrogen. I found a page in my McGraw / Hill Encyclopedia of Chemistry 2nd Edition, that gives104.2 kcal / mole at 25 degrees C which corresponds well with the value in your reference. Converting from joules it is a close match.

Fusionfire
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 Quote: Originally posted by Mr. Wizard Fusionfire, I hadn't seen that interesting pdf about atomic hydrogen. I found a page in my McGraw / Hill Encyclopedia of Chemistry 2nd Edition, that gives104.2 kcal / mole at 25 degrees C which corresponds well with the value in your reference. Converting from joules it is a close match.

Hmmm, fascinating scan you provided. I'm going to buy that book when I get back from my holidays

It is clear that anyone who makes atomic hydrogen not only makes a powerful fuel/explosive/energy store, but also a very useful precursor chemical that can be used to produce all sorts of reactive products (reduce reactive metals, H2O2, produce hydrides, etc.)

Care to start a thread in a suitable sub-forum (I think technochemistry) about ideas to try to stabilise atomic hydrogen?

Would continuous irradiation with photons of the right frequency work if the goal is to keep the hydrogen atoms as positive hydrogen ions + free electrons?
Mr. Wizard
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I bought the book from some guy at a swap meet for next to nothing, and I see from a quick search of the name you can still buy it for next to nothing (3.97) It is a fairly large book, filled with all kinds of esoteric information. I found the information about the monatomic hydrogen after my first post on this thread. I don't care to or feel qualified to start a thread about it, but if want to feel free. The method used now to isolate the material is to use the atoms that have their electron and proton spins aligned so as to make it possible to keep the atoms aligned in a magnetic field. Since atoms sharing the same magnetic spin or alignment cannot share the same orbital they can't combine to form H2. I can't say I understand the Pauli exclusion principle but it is based on it. I think its like bar magnets repelling like poles. When the bar magnets flip over the H atoms can combine, with the protons sharing the two electrons that have their spins in opposite directions. The spinning electron generate a magnetic pole. Anyone with more understanding please explain it better. Fusionfire Hazard to Others Posts: 219 Registered: 8-7-2011 Member Is Offline Mood: No Mood  Quote: Originally posted by Mr. Wizard I bought the book from some guy at a swap meet for next to nothing, and I see from a quick search of the name you can still buy it for next to nothing (3.97) It is a fairly large book, filled with all kinds of esoteric information. I found the information about the monatomic hydrogen after my first post on this thread. I don't care to or feel qualified to start a thread about it, but if want to feel free. The method used now to isolate the material is to use the atoms that have their electron and proton spins aligned so as to make it possible to keep the atoms aligned in a magnetic field. Since atoms sharing the same magnetic spin or alignment cannot share the same orbital they can't combine to form H2. I can't say I understand the Pauli exclusion principle but it is based on it. I think its like bar magnets repelling like poles. When the bar magnets flip over the H atoms can combine, with the protons sharing the two electrons that have their spins in opposite directions. The spinning electron generate a magnetic pole. Anyone with more understanding please explain it better.

OK I'll go start a thread in the technochemistry forum so we don't hijack this thread.
Methyl.Magic
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 Quote: Originally posted by rstar I think the strongest base is n-Butyllithium eh... don't laugh... ..I might be wrong !!

No, tert-butyllithium is the strongest base available. Since n-butylpotassium can be made via the schlosser method I think n-butylcesium can be made too ?
Zan Divine
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Hardest - Rhenium diboride >10 Mohs

Cyclopentyl cesium ought to be pretty basic. It's not really possible to name the most basic.

I think the strongest acids known presently may be the carborane superacids.

[Edited on 30-1-2012 by Zan Divine]
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 Quote: Originally posted by Zan Divine I think the strongest acids known presently may be the carborane superacids. [Edited on 30-1-2012 by Zan Divine]

Yeah, and the cool thing about it is, that they are also very gentle. Perfect H+ donor for making AP

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Formatik
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Superfluid helium (beyond "liquid helium") is one of the most extreme liquids known:

Here is an aluminium boat floating on sulfur hexafluoride (d= > 6g/L). The gas is completely harmless to inhale:

Phantom
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 Quote: Originally posted by nezza I thought lead azide has the fastest velocity of propagation for non-nuclear explosives. Does Octanitrocubane beat it ?.

Of course. Lead Azide is in the middle with his 5180 m/s @ 4.0 g/cc.

ONC : 10100m/s

tatapouette
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Quote: Originally posted by Methyl.Magic
 Quote: Originally posted by rstar I think the strongest base is n-Butyllithium eh... don't laugh... ..I might be wrong !!

No, tert-butyllithium is the strongest base available. Since n-butylpotassium can be made via the schlosser method I think n-butylcesium can be made too ?

It is known that t-BuLi is stronger than n-BuLi. But, as already said, for these extreme compounds, measure of pKa is difficult, if not impossible. Maybe another way to measure the strength of these compounds could be their rate of deprotonating the solvent in which they are used (even if pKa is not a cinetic, but thermodynamic parameter...).
For example, it is said in wiki (and ref herein (even if not checked ^^ )) that :
- n-BuLi has a half-life of 153 hours in Et2O at 20°C ;
- whereas t-BuLi's is less than 30 minutes !!

Talking about BuLi and stuff, I was wondering : as n-BuLi seems to be 'easily' made in industry by :
n-BuX + Li(0) -> n-BuLi + LiX
with X = Cl or Br

couldn't n-BuNa or n-BuK (or others) be made using the same way ?
If so, how come these aren't produced ? Does anyone have an answer ?

[Edited on 18-11-2012 by tatapouette]
Eddygp
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Dicyanoacetylene hottest flame of any chemical.

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Eddygp
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Sorry, last one was already written before. Titin, the largest protein known to man, with a molar mass of 2 million or 3 million.

there may be bugs in gfind

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Zan Divine
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Only stable species are included in this list

Highest catenation observed with nitrogen atoms = 5 in the pentazenium cation (also known as pentanitrogen)

Highest thermal conductivity, He II

Metal with the highest specific heat, Lithium

Metal with the highest Young's modulus, Osmium

Most refractory material, Tantalum hafnium carbide (Ta4HfC5), with a melting point of 4215 °C.

Highest coordination number in a planar species, decacoordinated molecular wheels anions, Ta©B10− and Nb©B10− (these are doubly aromatic! they have six delocalized pi electrons and another 10 delocalized sigma electrons)

Highest coordination number in a non-planar species, Thorium dimethylaminodiboranate, Th(H3BNMe2BH3)4. The thorium atom is coordinated to 15 hydrogens.

Highest specific impulse (isp), Metastable Helium

[Edited on 11/18/2012 by Zan Divine]

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weschem
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Quote: Originally posted by simba
 Quote: Originally posted by paulr1234 Most potent inorganic neurotoxin (I think Botulism is actually the most potent neurotoxin but given that it is a naturally occurring protein, I'm not sure where it should sit in a chemical taxonomy).

Botulinum is in fact the most acutely toxic substance known. Less than a kilo is enough to kill the whole planet.

I read just a pint is enough to kill the entire planet. Kind of scary that it can be found almost anywhere and rich white women get it injected into their faces.
Nitrous2000
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 Quote: Originally posted by Formatik Superfluid helium (beyond "liquid helium") is one of the most extreme liquids known: http://www.youtube.com/watch?v=2Z6UJbwxBZI&NR Here is an aluminium boat floating on sulfur hexafluoride (d= > 6g/L). The gas is completely harmless to inhale: http://www.youtube.com/watch?v=1PJTq2xQiQ0

Hardly harmless to inhale. It is both an asphyxiant and a gas that is not easily cleared from the lungs.
Tsjerk
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As asphyxiating as nitrogen and while typing this post I cleared my lungs of gas multiple times...
Praxichys
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 Quote: Originally posted by Nitrous2000 Hardly harmless to inhale. It is both an asphyxiant and a gas that is not easily cleared from the lungs.
This is a myth. Turbulence from air passing through the tiny tubes in your lungs would effectively mix the gases. They will not separate again because kinetic diffusion is far stronger than their gravitational buoyancy in each other.

Even if you took a gigantic breath of SF6 followed by normal breaths that did not fully purge it, low blood oxygen would cause you to feel out of breath and want to breathe harder, expelling it anyway.

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 Sciencemadness Discussion Board » Fundamentals » Chemistry in General » Most extreme compounds known to man Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues