Horza2002

Its a brilliant entertaiment show yes. But they rarely have anything that even remotely resemebles what science is really like. And I have to agree with Kyrisch, most of the myths they do can either be disproved with some basic maths or just thinking it through!

People where getting worried about them possibley having nuclear weapons mainly because Iran had made it very clear they want to wipe Isralie of the face of the planet! People are worried that if they ever get nuclear weapons, then they'll use them against Isralie.

kp1010, what area are you hoping to study for your PhD?

OK, for an atom there are four different quantum numbers that describe the electrons in the atom. These are The principal quantum number, n Orbital angluar momentum quantum number, l Magnetic quantum number, ml Magnetic spin number, ms Now the principal quantum number n can take any value from 1 upto infinity. The orbital QN, l, can take a value from 0 upto n-1 (where n is the principal QN) The magnetic quantum number can have values from -l...0...l (where l is the orbital QN) The magnetic spin number is either 1/2 or -1/2 (for electrons anyway) The final thing you need to know is that two electron in the same atom can not have the same set of QN. So at the being, n=1 and so l=0, ml=0 and ms= +/- 0.5. This means that you can only but two electrons when n=1. When n=2, l=0 and 1 so ml=-1, 0, 1. This allows you to have 8 electrons when n =2. Hopefully thats helped....

Definately not, the group I work with has PhD varying from 22 upto 31. Age should not hold you back

No, if you put the two between the Ca and O (Ca2O THIS IS NOT CORRECT), then that means you have two calcium ions bound to a single oxygen atom. What this reaction makes is in fact two CaO (calcium oxide) molecules. So, you where right you do need to balance the oxygens on the right hand side: Ca + O2 --> 2CaO But this is still not balanced seeing as you now have tywo calcium on the right, so overal: 2Ca + O2 --> 2CaO

It syas in that article as well that slowly increasing the pressure causes a smooth increase in the tunneling current. But isn't the tunelling current an exponetial function...so as you get closer it gets alot bigger a lot faster?

Ive drawn out what I mean. It doesn't matter if they have the same number of resonance srcutures, its how stable the anion is what is important. In the case when the nitro is meta, the anion can't be stabilised by the electron withdrawing nitro group. However, when the nitro is ortho or para, it has no problem in being stbaiulised by the nitro group. An anion on oxygen is far more stable than one on carbon (electronegativity). And remember that nitro groups are one the most electron withdrawing you can have.

I thought something like this had been known to go on for a while...but maybe I'm wrong. I know that often H+ in enzymes tunnel between enzyme and substrate in a lot of enzymes in biological systems.

For chemical processes (and I assume some physics) you can use statistical mechanics to predict the thermodynamic behaviour of a system.

akcapr, draw curly arrows for the anion and you'll find that meta is the only poistion a nitro group will no stabilise the anion

Arrr yes very good point.... lol yep i forgot that you don't get the double bond back.....let me have a rethink! Merged post follows: Consecutive posts mergedDraw the curly arrows from the deproataned amine. You'll find that meta is the only position it wont get into the nitro Merged post follows: Consecutive posts mergedSorry ignore that bit about curly arrows and nitro groups

Hey guys, for my final year organometallic module, I need to make a poster on some current organometallic research. I'm thinking either CO2/epoxide copolymerisation or CO2 convertion to CO for use as syngas. Has anyone got any other ideas?

I never said do it at standard conditions though did i! And to be honest I didn't consider that the MnO2 would decompose if you heated it like in a blast furnace

Ive just had a quick look at the problem and this was just the first one i came up with. All the steps are a well known as are the starting materials so it shoud work ok then. The second step is a 6-endo0DIG cyclisation which might be a little slow but should be ok.

In principle yes, there is that equilibrium. But in practise the equilbrium will lie well on the side of 2 H2O. http://www.chemguide.co.uk/physical/acidbaseeqia/kw.html That link exaplins what is kown as the ionic product of water, Kw. It calculates that at any one time, there is only 1x10(-7) M of the ionic form ion water so it is indeed tiny.

You could try bubbling oxygen gas through it and try and oxidise the carbon to carbon dioxide....that might work....but I guess you'd also run the risk of oxidising the manganese too...

yes. for example...if you have HCl acid...what u really have is H3O+ and Cl-....in this case there will be ionic interactions seeing as there are ions involved.

I saw this article on the BBC website http://news.bbc.co.uk/1/hi/uk/8489019.stm I've personally never tried homeopathic remidies before....I was wondering if anyone hear has actually used them and what they think.

If the water managed to pull that hydrogen completely off the other moleules (i.e deprotonate it) then you'd have an ionic interaction. I think ionic bonds are typically reserved for things like Na+ and Cl- in a lattice.

Both the above are true. Ehanol and acetone will also interfere with waters H-bond system making it less efficient. With that happening, water will more easily evapourate

lets look at the facts: Water is at least 50% more potent a greenhouse gas than CO2 Over 80% of global warming is caused by water in the atmosphere Humans are resonsible for about 2% of all CO2 emmisions each year. From the article, global temperatures begin to level off even though CO2 emisions remain constant/increase. It therefore implies that CO2 has a limited effect on global temperature and seeing as humans have a tny influence on CO2 concentrations then humans are not to blame for global warming. Merged post follows: Consecutive posts merged Thanks very much for that link, I shall have a look at his work

http://www.nature.com/news/2010/100128/full/news.2010.42.html Another article showing that human caused global warming is a myth. But what are the chances this never makes the headlines.

The nitro group is in the wrong place to help stabilise the anion. Its meta to the amine so will only have a tiny stabilisng effect. If it was ortho or para to the amine it MIGHT b able to deprotante the amin but i seriously doubt it. 2,4,6 tri nitro aniline might be ok...

Seeing as Vit C is an acid, you should be able to rextracted it by washing with an basic solution followed by reacidifying it