Natural Science Forum / Chemistry / General Chemistry / April 2007

Sorry, I couldn't find a more appropriate place to post this. I hope it's
not considered off topic.
I'm trying to write some software to read in PDB files and I've pored over
the documentation and I'm trying to figure out how bonding between atoms is

would it be possible to initiate a chemical reaction that would
ultimately lead to a very good vacuum? that is, the product of a
chemical reaction ends up taking less space than before in a confined
chamber and maintaining that volume despite the newly formed vacuum?

I saw a great website that sells chemistry notebooks with carbonless
copy pages. Their prices are the lowest I have seen so far. Check them
out www.barbakam.com

Its been a long while since I did any chemistry, can anyone give me an
outline of how one calculates the probability of a given chemical
reaction occurring, or how one would use thermodynamics to work out
the likelihood of a reaction occurring.

Hello! I've this scheme of process :
http://img90.imageshack.us/my.php?image=schemagf8.jpg
related to a plant for distillation of water (low % of sodium
bicarbonato )

Hello I am Shaniya
I am Year 11 student from Alfriston College. I am currently doing a
science experiment investigating which temporary pain relief is
absorbed the quickest in your body providing you with efficient

Our lab has ZnO and Al2O3.
ZnO ( about 0.5g solid ) + HCl (1M), turns universal indicator from
red to green (pH7.0).
But things didn't go so well when I tried

           As I know, some Zircon contains radiation level that is
exceed safety level. I want to find information how to reduce the
radiation level of Zircon. Please suggest any website or resource
that is talking about how to reduce the radiation level of Zircon.

It is my hope that some here can suggest one or more *inexpensive* sensors that could be used to improve pellet stove design.
BACKGROUND
I have recently improved the controller code on an existing line of pellet stoves.  I had to use the existing !@#$% microcontroller and the ...

Would it be
a) slush with bubbles
b) phase separated
c) something else

Who are the best suppliers of GC/MS quality gases, i.e. helium,
hydrogen, methane? Price is a consideration. Does anyone use traps
(water/oxygen/hydrocarbon) in an effort to save money on high price
research quality gases?

If I was to use a number of thermo electric generators (peltier effect
devices) to cool a heatsink to -80 would i get dry ice forming on the
outside of it?
Cheers in advance

Is there  place from which meaningful chemistry sets can be obtained? I am
looking for something at high school level rather than toys for little kids.
Bill
-- Fermez le Bush--about two years to go.

Dr Gideon Polya published some 130 works in a 4 decade scientific
career, most recently a huge pharmacological reference text
"Biochemical Targets of Plant Bioactive Compounds" (Taylor & Francis,
New York & London, 2003), and is currently editing a completed book on

I have deposited a couple of Si 100 wafers with TiN (around 70 nm) and
i now need to etch the TiN in order to measure the thickness of the
film. I did ellipsometry already, but i also want to use a stylus.
Do you know of an etching recipe (dry or wet) that will etch TiN