/sci/ - Science & Math

>>5132224
Well guys, I am getting tired and have to take a nap/go back to work.

Check out my youtube page if you are bored or need any help. I will be here for about 30 more mins.
http://www.youtube.com/user/TutorChem

>>5132545
Yes. Go see a dermatologist. It seems weird because you think skin only with them.

>>5132535
lol Maybe. My friend's father is a dermatologist and he says there is a lot you can do to prevent it. The science has come a long way.

>>5132507
6) Use hot water when cleaning dishes, it will clean them more efficiently
7) When you chew aluminum foil with amalgum filling, the pain you feel is brought about by the electrochemistry occuring between the two.

... this is tough. I am a theoretician! I am not used to practical! lol

>>5132520
A little of both.

We use the Dirac Hamiltonian with something called the Zeroth Order Regular Approximation (ZORA) to compute our energies and electron densities. We also have to include a correction in our basis sets.

It is basically introduction a parameter to take relativity into account

>>5132507
Ok.
1) Filling your tires with nitrogen does not save you money, the atmosphere is 79% nitrogen so there is almost no difference in the density of the air in your tires and that of pure nitrogen.
2) Chew wintergreen lifesavers in the dark infront of a mirror, you will see it glow.
3) Acetone will take off perminant marker, it is nail polish remover.
4) To burn something without leaving a mark (such as on a mirro) use rubbing alcohol.
5) Copper is very important for hair growth. Eat more copper is you want your hair to grow faster.

THinking of more...

>>5132494
I use DFT (density functional theory) that uses the ground state electron denisty to predict various properties of the molecules/systems I look at. THIs was shown by W. Kohn that you can use the ground state electron density to know everything about a molecule similar to a wave function.
>>explicitly solve
Nope. It is impossible to solve the schrodinger equation exactly for anything beyond a one electron system. THis has to deal with something called the many bodied problem.

>relativist effects
Yes we do for the heavy elements. I usually only incorperate them when I investigate gold surfaces. You culd use them for simple systems without heavy elements for a more complete treatment of the system, but it almost does not change results for light atoms. Heavy atoms can change things a ton.

>>5132475
They are used in biochem to look at different binding sites of proteins:
http://www.chemistry.buffalo.edu/people/faculty/morrow/

Also in terms of nuclear waste:
http://ja01.chem.buffalo.edu/~jochena/research/research.html
Look at the heavy elements section here

>>5132457
IN no real order of importance

1) How Heme works
2) What orbitals are
3) How everything is just trying to be at lowest energy
4) Entropy is always increasing
5) Chemistry can be used to answer almost any question
6) Molecules are not static, they are constantly in motion
7) We currently do not understand water completely
8) How there are radicals floating in the air and without the hydroxyl radical nothing would burn
9) Quantum mechanics does not mean that there are endless posiblities (the word probability gives people the illusion that things are not completely determined by equations, I think everything can be explained in equations)
10) Molecular orbital theory has so much power to explain chemistry.

THere is a ton more, it is hard to localize this train of thought lol

>>5132450
Nice gif.

All you need to do is determine how many electrons are flowing for two half reactions, then for the overall reaction make them balance.

Some basic guidelines are that Oxygen always carries a negative 2 charge and the halogens almost always carry a -1. Oxygen only carries a -1 when it is in a peroxide. Other than that you can use the tables in the back of your book or reference table to help you solve the question

>>5132454
YOu really have to dive in the new literature for this one. Try the American chemical society web stuff for this one. Try to search for lanthanides and actinides complexes. Also you can use scifinder web to search the chemical structure of different compounds.

You may not find anything though. These compounds are on the edge of research currently.

>>5132446
>singular perturbation analysis
lol Oh dear god. I have not done this in a long time.

Can you give me any more data than that? I remember almost nothing from fluid dynamics and diff. eq. It has been a good 5 years since then and I have never once used that stuff lol

>>5132431
It depends what type of reaction they are doing. FOr the most part it is assumed that it is sulfate because that anion is much more stable than the sulfite anion.

>>5132404
That is when it gets tricky.... It depends on how you think about it. The real picture is somewhere in between, and makes you actually think about what is a bond... Being a theorist I have an existential crisis once a week thinking about this stuff lol

>>5132415
It is great to get an undergraduate degree in. ANymore than that, and you will not find a job, or should have just used the time to get a business degree.

I had a physics minor and was considered to be a chemical engineer (as I took all the courses for it but my institution did not have a chemical engineering prorgram). I had many job offers in my home town that would have paid me over 60k... but I chose school because having worked for the places during internships I knew how boring the jobs would be.

>>5132407
Not usually. We are working on something to do it, and it will not cost anything but I hate coding and it takes time lol

>>5132398
Hrmmm you may need to elaborate more. THis might have something to do with the pH of your solution. Mg can react with OH- to form a sparing soluble salt.

There are actually a bunch of things that could be wrong. The value you get is not terrible though... maybe you could elaborate more. What other ions did you look at?

>>5132390
lolz NIce gif.

TO answer your question it has to deal with the valence of Mg, Mg has two valance electrons that want to either bond with something or to be given to something. Cl has seven valence electrons, but wants eight (octet rule). Each Cl takes one electron each leading to MgCl2. Does this help?

>>5132382
Also here are some of my journal articles on the subject. If you have access through your institution...
http://www.surfacechemistry.comeze.com/1_3_Publications.html

>>5132369
lol THis is Roald Hoffmann's review on a 1D hydrogen chain, isn't it?

No I do not. I currently work in the relm of surface physics, yet I am a chemist. I have given chemical insight using my intuition (along with calculations) to show that there is some benefit to having this chemical intuition. WHile much of materials science is doing this, if you walk up to any inorganic and organic chemistry lab you can still see that they draw orbitals out and things along those lines.

I hope this answered your question.

>>5132302
Neat! WHat is the focus of the journal?

>>5132327
Electronegativity is related to atomic radius. For a review of this check out this youtube thing:
http://www.youtube.com/watch?v=qnSyZfzU2_g

Otherwise EN can be used to predict what atom will be taking or giving electrons. THe left of the periodic table is less electronegative, the right more highly EN. The higher the EN the less likely something is to give up and electron while lower leads to something giving up an electron. Linus Pauli did a lot of work on this stuff.

>>5132340
lol Yeah. I am at a computer all day so it helps. In my undergrad though I did environmental chemistry where I synthesized PCDEs and ran a G/MS all day lol

>>5132325
Thanks lol