Natural Science Forum / Chemistry / General Chemistry / November 2004

Hi, Everyone!
What is the boiling temperature of L-theanine? Also, what is the
boiling temperature of caffeine?
Thank You

Why do ionic substances get decomposed in solution and molecular ones
don't?
As far s I know ionic substances are much stronger...
And how does it happen that a cation gives all his electrons in the

Could Amercium from smoke detectors decay to form Radon that could cause
basement radon detectors to trigger? Because now I notice we put our test kit
too close to the smoke detector, even though it registered a low-enough level.

Few years ago a friend of mine had a metallic ink pen, and if you
burnt paper with writing on it, the letters would birghtly glow
briefly before burning out.
I bought out the metallic pen section at staples and none of them do

I'm in first year college and I'm having some trouble with my
chemistry lab. I reacted varying amounts of HCL, acetone and iodine
with water in 4 different systems (20 ml of one, 10 ml of all the
others) and recorded the reaction times. I then calculated the

If you going down the halogens (and hydrogen) you'll see the oxides are written
H2O, OF2, Cl2O, Br2O, I2O, but why is it in the case of Fluorine you write
oxygen first?

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Which constants are most commonly used in contemporary text books and
catalogues to describe strength of acids and bases? I have looked
through the books I have at home - total chaos. Every book and sometimes
even every table is different - stepwise/overall,

I guess it's not my lucky day. After spending some time and chemicals
on the binding of complex biomolecules, there is the need for some
gold-tethered imidazole molecules. Walk in the park, I think. No, it
isn't. A reaction I thought trivial also takes time and energy to

Heat is desrcibed as the vibration of molecules right? How then does
heat travel through a vacuum? My other question was if copper is a
better conductor of heat than aluminum, why does aluminum distinctively
feel colder to the touch?

If a solution is quoted as a 4% aqueous solution what does this
mean??
Does this refer to weight percentage??
I was told that this means 4mg of the solid added to 100ml of water

I want to know the outcome of this experiment:
Suppose I put a solid cylindrical electrode (anode/cathode) inside a
hollow cylindrical electrode (cathode/ anode) so that there is only a
minimal potential space between the two electrodes, and

Your opinions please.  Last week I was testing the pH of a solution
for injection into mice.  It contains 10% Cremophor-EL in PBS.  The
PBS alone yielded a pH of 7+ on paper (range 2 -11) and 7.50 on a
Beckman 350 with a standard probe.

    Is there a simple way to pull traces of oxygen from nitrogen?

All right...
I've googled...
I've searched...
And I still can't find a good resource on the various uses of elements