mississippichem

In a low pressure scenario the [ce] He^-[/ce] ion may last a little longer because it is less likely to collide into another atom. It won't make much difference though. This is an unstable species on effective nuclear charge grounds. The helium nucleus doesn't have enough potential to hold onto that third electron, and the 2s orbital the third electron will be in is much higher in energy than the other two electrons. When a nucleus only has two protons an extra electron is hard to handle, and that electron is likely to be ionized. Also working against this ion's stability is the fact that the third electron will not be spin paired, small radicals tend not to last long.

Hydrogen bonds are weak non-covalent bonds between hydrogen attached to an electronegative element and another electronegative element. Here is acetylsalicyclic acid. The ester functional group and the carboxylic acid functional group are the groups on the side of the ring with the oxygens. Ethanol and Methanol have -OH groups and these groups have hydrogen bond interactions with acetylsalicyclic acid.

The carboxylic acid functionality can receive hydrogen bonds from -OH groups of alcohols.

Very true. I use the symmetry operations on a daily basis in analyzing UV spectroscopy [looking for specific electronic transitions]. The concepts were difficult to get a handle on at first, but well worth it. Maybe one day DFT will advance to the level to were I don't have to consciously remember symmetry operations and point groups. That would be nice. I hope computer scientists don't engineer me out of a job though! EDIT:double post deleted

[22:07] <hypervalent_iodine> welcome back [22:07] <hypervalent_iodine> I bet [22:07] <mississippichem> quartz just kicked my ass [22:07] <mississippichem> I got a black eye [22:07] <@Capn_Refsmmat> I dunno what that was for [22:08] <@Azure> MSG90C obviously [22:08] <mississippichem> it didn't like the mention of group theory [22:08] <@Azure> hawt [22:08] <+Satan> I applaud quartz's effort to keep #sfn group theory free [22:09] <mississippichem> this is destined for IRC quotes thread [22:10] <+Gilded> Group theory? GROUP THEORY?! We don't need no stinking group theory!

And that's why A Tripolation's perspectives are appreciated and respected here on the forum; it's rational theism. Though many of us are atheists [myself included] we have no problem with belief in a god, however this is a science forum and only scientific viewpoints on the origin of the universe are deemed acceptable here. One can easily be a Christian and embrace mainstream science, A Tripolation is a prime example. Telling people in the forum to "stop being foolish" and "start living the truth" is frowned upon here not only because it is blatant preaching but because it is not a good route to rational discourse. If you have a scientific argument for a young Earth or disputing evolution, I'm sure folks will be glad to listen, comment and debate accordingly. If your argument isn't scientific don't bother; nobody cares.

It's also quite easy, in the chemistry world at least, to get listed as a coauthor in a journal published paper. I assume there is a similar situation in physics. My degree also requires original research with a thesis by the way.

Kinases that exhibit "faster than diffusion" kinetics seem to be a hot topic right now, especially if you do computational work.

In step (I) of your diagram Aspartate-231 [D231] attacks C1 of the furanose through the D231 carboxylic oxygen. This is a nucleophilic attack. Remember that C1 will be slightly elctrophylic being attached to the ring O and the alkoxy O.

Organo-wiki is nice. I also read "Carbon Based Curiosities".

Yes, but when it gets cold enough or too concentrated, those "dimers, trimers...oligomers" go colloidal or even degrade to Mg clusters. It actually yields an extremely diverse mix of organomagnesium species.

Science is extremely complicated. We're attempting to figure out the universe here. It takes a while for a student to become versed enough in the math and the languauge to be able to work side by side with the pros. As has been said in this thread, there are plenty of opportunities for undergraduate research. Science is for the patient. It takes a while to accomplish something in science. However, when one does accomplish something the reward can be enormously intellectually rewarding and sometimes even financially rewarding.

For the record iron transitions from the hard [math]\alpha[/math]-phase to the softer [math] \gamma[/math]-phase around 900 C. This would easily allow a 100+ story building to collapse without the aid of demolition explosives.

Not reversible? Yeah I didn't think so. That's worth looking into.

The Grignard + carbon dioxide to give carb. acid reaction is a beautiful one; high yielding and clean. I've done it with dry ice pellets. One must be careful not to add too much dry ice though, a cold Grignard will conglomerate into a nasty divalent oranomagnesium species, and I'm not sure how reversible it is.

You'll have to distill after the second nitration to separate 1-amino-4-nitrobenzene and the small amount of 1-amino-2-nitrobenzene that will also form if you take the "double-nitration" route. You should really just buy some though if this isn't a mental synthesis exercise. Nitration reactions of aromatics are nasty.

Salt, NaCl is an ionic compound. Ionic compounds are not very soluble at all in non-polar solvents like oils. If you shake the mixture vigorously, the NaCl will migrate to the aqueous layer.

50 points on the crackpot index. I imagine we will reach bingo in the near future. Where you at Swansont?

Does anyone know if the arsenic analogue of tri-phosphate [tri-arsenate] has every been observed, even en vitro [perhaps in dichloromethane]? A cell running on ATA instead of ATP would be a more noteworthy find. Seems doubtful that could occur though do to the As-O bond's tending to be hydrolyzed as has been mentioned many times before.

Lemur, If everyone was allowed to just waltz through national borders without consequence, then how are we to keep any order in the developed world? If we just opened the floodgates then every impoverished underpaid person from the third world would come to the US, Canada or western Europe. The situation in the first world would soon begin to look like the third world these migrants were trying to escape from. Unemployment in the US is very high right now (compared to the standard to which we have become accustom); how do you think we would be able to provide jobs for everyone? Ethnicity has nothing to do with it. If borders didn't exist or weren't enforced then the Earth would quickly become a wasteland ruled by mobs, criminals, and whoever has the biggest guns. What would be there to stop foreign armies from invading? Look at the situation in Afganistan and Pakistan. The border towns between the two nations lie in waste because neither government has the stones to stop Taliban or Al Quaeda from running their game on these poor defenseless people who live in the border gray area. So these terrorists (terrorism isn't the point, it could just as easily be criminals or a small foreign army) just run back and forth between the two countries and are allowed to evade capture. I don't have stats to back this, but I imagine the reason that most migrants from Mexico try to illegally cross the border is to find gainful employment. These people are desperate for work and a chance at a better quality of life. If they were deported from the US and got offered a job at a US owned factory the next day in Mexico, I expect they would gladly take it to feed their families. Only here in the first world do we really have the luxury of choosing work based on our political and ethical views. In less fortunate places, people are starving and are willing to do anything to allow their families to eat for one more day.

Earth's gravity can be quantified to give an approximate acceleration of [math] 9.8 m/s^{2} [/math]. What is the wrongness value for killing babies? Please show your work and express your answer in appropriate units.

Very that good is. I agreeing mostly though you.

I've always taken the cynical view that morality is a result of our genetic programming. Us not not running around killing each other constantly offers us an evolutionary advantage. If you need to go to the grocery store for an hour I'll watch your toddler and take care of him for you, so then in the future whenever I need a hand with something, you might help me out. Watching someone's toddler seems like a trivial favor now; but would've been more crucial back when toddlers were eaten by saber-toothed tigers regularly. Natural selection has allowed us to figure out the balance between selfish propagation of our own genetic line, and collective genetic propagation of the species. If I were on the side of the road starving, someone might help me; but if I break into someone's house to steal food, they might kill me. Morality is the part of our brain that gets tricks into carrying out our genetic functions by holding our emotions hostage. "Immoral" activities come with the promise of unpleasant emotions. If someone kills his own brother, then he will probably feel some guilt at some point. Back in cave man times, one's brother might have been his closest ally in hunting, fighting, and gathering food. So it was then, not only immoral to kill your brother, it was a terrible strategic blunder. EDIT: I voted no to morality being a science because neuroscience and genetics are not yet on the level where we can adequately examine these phenomena.

You mean like electro-spray mass spec?

I usually use a neutral fluoride donor, like NaF. The fluoride anion is good because it is largely non-coordinating to d-centers (bad orbital overlap with d-hybrids, not willing to back donate an electron pair). There are some steps though where I need to leave one deprotonated hydroxide (secondary) and protect a primary hydroxide so it can last through a substitution I'm doing on the other end of the (very large) mixed metal macrostructure. And yes, I would guess that steric factors do influence that protection's selectivity more so than anion stability. Especially for bulky attackers like TBDPS. *My ligands are fairly labile in polar solvents, so I'm worried that a pre-protecting group that could attack my coordinated oxygen could separate my ligand from the center, and cause a drastic geometry shift! Coordination chemistry with mixed metal complexes is very unforgiving. The metal centers can redox each other, and some geometry shifts caused by equilibrium shifts of labile ligands end up being practically irreversible (though not in theory irreversible, you're going to have to start over).[Mississippichem pulls his hair and sighs]