Natural Science Forum / Chemistry / General Chemistry / August 2006

Is there some semi-permeable membrance available at a retail store that
is suitable for demonstrating osmosis with NaCl and H2O?

Can someone explain in simple terms (so I can in the future carry my own
calculations out) how to calculate the volume of a saturated gas (100%) when
currently having the analysis of a dry-gas.
Currently I have a gas flow of 8700 Nm3/hr (dry) @ 55 deg.C & 70mbar(g) of:

sorry if this is not the appropriate newsgroup; if so, I'd be glad for any
tips.
I have a question regarding terminology. It concerns what one calls an
agent, if any exists, that is used to make substances mix. It would not be a

I am looking for some info, and my sources contradicting each other.
Does anyone know is Tin (Sn - Stannum) essential element or not?
Thanks,
--

LOSE A PLANET, GAIN AN ELEMENT...
Forwarded message from simanton@aol.com
[ Subject: Lose A Planet, Gain An Element....
[ From: simanton@aol.com

I've a few questions about the miniature fuel cell described at
http://sci-toys.com/scitoys/scitoys/echem/fuel_cell/fuel_cell.html
The page describes performing electrolysis with platinum electrodes and
a nine volt battery in a glass of water.  My understanding is that

Thanks to all who made suggestions re. the disposal of 300g of sodium
metal (apart from the guy who said dessolve it in NaCL solution).
I've had another suggestion from someone else - burn it. Not having
burnt sodium before, I'd like to check with you first. If sodium is

we know from Nicholas Pine, that one pound of anhydrous Lithium
Chloride taken to infinite dilution via absorption of ambient humidity,
will release 1379 BTUs.
Does it work in reverse?  Will a dilute LiCl solution taken to a less

What is Fenton's Reagent used for? Is the iron in it Fe2O3, or Fe3O4,
or some other iron salt? Is the iron a fine powder, or course granules?
What would happen if I dripped it on petroleum jelly? What would happen
if I mixed it into a combustable mixture containing aluminum

Hi!!! I'm trying to make Napalm-B (I like to burn my old junk), and I'm
just wondering, will this mix explode:
46 parts analytical grade polystyrene
33 parts 110 octane racing gasoline (or would pure octane be better?

Can anybody tell the name of any negative catalyst for this reaction
2O -----> 3O
   3              2
or atleast tell the temperature at which the rate of reaction is

All I wanted to know was can there be different virsons of the same
hormone that differ in atomic structure. Some hormones that are
products of endocrine glands are proteins or peptides; others are
steroids. However as everyone says all hormones have exactly the same

* Melting point: below 700C (preferably much lower)
* Usable at up to 850C without emitting toxic fumes (MgCl2 is out. NaCl
too?)
* Safe to handle without special precautions when cold.

True Vapor Pressure is defined as vapor pressure of the liquid in
absence of anything else. Meanwhile, vapor pressure is defined as
pressure exerted by the liquid vapor which is in equilibrium with the
liquid. Can someone point to me the difference between both and is

Is it possible to have a chemical in a mixture that will inhibit a
molecular sieve from sucking out another substance in the mixture?