Why BF3 exists when BH3 does not?
402864
Actually BH3 does exist.  It is a very common reagent used in the hydroboration of double boonds, and in the reduction of amides to amines.  After adding across double bonds the borane can be hydrolysed to the alcohol, effectively completing the addition of water across a double bond.  Improtantly this addition is completed in an anti-Markovnikov manner, because in BH3 the H are electronegative, whereas in water they are electropositive. \n\nBecause of its instability it exists as a dimer, B2H6, where elextrons are shared between each of the monomers.  It is a gas, but is used in chemistry as solutions in THF, pyridine or dimethyl sulfide.  In these solutions the lone pair of electrons from the oxyge,, nitrogen or sulfur, are donated to the empty p orbital of boron, stabilising the BH3:solvent complex.\n\nBorane chemistry is a massive field and has enormous use in synthetic organic chemistry, with BH3 being exceptionally useful for a number of transformations and funcional group interconversions.\n\nI have used it many times, and it has been around for well over 50 years.  It can be purchased from many sources, including that listed below provided to demonstrate its commercial availability.\n\nIf you want more information let me know.\n\nI hope this helps.
643934
Levit, Britain couldnt hold The germans off at all???? three words for you my friend BATTLE OF BRITAIN, the british did just that they held the germans off thanx to THE FEW, the men and women of RAF fighter command many of whom were not much older than thier late teens and early twenty's, after defeat in the BATTLE of BRITAIN the germans turned thier attentions to Russia and got thier arses kicked, plz do some re-search on these things before you open your mouth and insert your foot in it.
975531
Are you aware the first two don't play anymore?\n\nThere's also Saha.
1073429
I've heard of this, its nothing but a small bug in the beta, it will be released without this bug in the final which I belive is going to be launched this friday.
763782
number 3 would be incorrect
793032
16ab = 2 x 2 x 2 x 2 x a x b\n48ab = 2 x 2 x 2 x 2 x 3 x a x b\n80ab = 2 x 2 x 2 x 2 x 5 x a x b\n\nNow HCF is the biggest COMMON factor ie biggest factor of them all\n\nSo it has 4 2's 1 a and 1 b since each one of these terms have 4 2's, 1 a and 1 b and nothing else in common.\n\nThus HCF = 2 x 2 x 2 x 2 x a x b = 16ab\n\nI do not understand what you meant by this: 2 3 3 4 2 2
898328
First look at the reaction.  You need 4 moles of BF3 and 3 moles of 3 H2O. or 4/3 = 1.333\n\n5.63 grams of water are 0.313 moles of water.  In order for H2O not to be the limiting reagent you will need at least 0.313 * 1.333 moles = of BF3 or 0.418.  You have more than that (0.496 moles).  So if all your water reacts you will still be left with some BF3.  So water is the limiting factor.\n\nFor the second part, you remember that all water is used (because it is the limiting reagent).  Note from the reaction that for each 3 moles of water, 3 moles of HBF4 are produced (or 1 to 1).\n\nUsing all your water (0.313 moles) will then give you the same moles of HBF4, or 0.313 moles of HBF4.\n\nThat's it.
93152
I don't know where the current battle rifle is being made but I thought it was being made by the Brits. Before this current rifle they were buying there rifles of the Belgiums who produced the FN-FAL series of rifles. The current Brit rifle is probabaly one of the best rifles ever made as it is customized to each soldlier.
715866
a new one? or do you just want one to romp around with in your back yard? ebay has used military vehicles once in a while, mostly just stripped hummers. either way, you mentioned a debate, and I'm assuming it has something to do with miltary spending on vehicles? if it is screw the trucks, look into how much the navy spends on sponges and how much they're a piece. anywho, good luck with the debate.
784072
Its apples and oranges. F15E is a fighter, the A10 is an attack aircraft used for close air support and killing tanks. The F15E is a much better fighter than an A10 will ever be. BUT I'm in currently in Afghanistan and love to see A10s coming to help us out. How many tanks and armored personnel carriers did A10s kill in Desert Storm? Its like comparing a Pit Bull and a Lab. Which one is better? Both? Just depends on your point of referance.
1123944
Battlefield 2, Call of Duty 2, Counter-strike Source, Battlefield Vietnam, Battlefield 1942, Fear, Doom 3 and Half-Life 2
490353
They don't seem to do that at all, unless they're doing something political about video games, such as banning them (stupid fools).\n\nThough it wouldn't suprise me if Bush played Battlefield 2.
406869
I think you miscopied the third item.  You have copied one of the first helf cells, not given a reaction.
797861
No dude.  That's way out of date.  The new one is the Black Hawk, awesome.
1029725
if you are moving onto base. I don't see why they wouldn't. My husband is an E3 but we don't live on base, it was our choice.
1152894
Bad planning in 03.For some assinine reason our higher-ups thought all of Iraq would be out there tossing flowers and dancing in the streets of every city and village ala occupied Europe when the Allies went through following D-Day, they didin't have a contingency plan for the Baa'th  party members and former Reuplican Guards and others who didn't want us there.\nSo they dispatched 150,000 troops instead of thrice the number needed to stabalize the country and get the Iraqis back on their feet.
1171476
never done a b4 format... is that something new?