Chemistry and related sciences

friends,
Here is a site http://freevideolectures.com/ which has huge collection
of video lectures and animations on Physics, mathematics and
Chemistry, Engineering and Medicine as well.

i am sure you will be shocked to see such a good collection……….

Pick at most six.  Here are mine: rhenium, tin, bismuth, caesium,
thorium, beryllium.

-Aut

I was just cleaning out some hydroponic pots for a new season. I am using
hydrogen peroxide to get rid of algae and other such crap. I started using
35% solution. The recommended dilution was 1oz to a gallon (96oz) of water.
This would give me an ultimate solution of about 0.35%.

Apparently, while trying to run brushes through some of the tubing, I dipped
my hands into the solution before it was fully diluted. The result was an
ashy white appearance on some of my fingers. It has now been a few hours
since that happened, and almost all that ashyness has disappeared.

Was that truly oxidized skin or components in the skin? Is that what I
should have expected from hydrogen peroxide? Who has had such exposure and
what happened?

Bill
— Fermez le Bush–about two years to go.

The global carbon cycle is not balanced.

From:
http://www.eoearth.org/article/Carbon_cycle

Carbon cycle

Lead Author: Michael Pidwirny (other articles)
Article Topics: Biogeochemistry, Atmospheric science and Climate
change
This article has been reviewed and approved by the following Topic
Editor: Jay Gulledge (other articles)
Last Updated: February 24, 2007
[...]
The "missing" carbon

Despite the scientific certainty that the global carbon cycle is
governed by the law of conservation, scientists are not able to
"balance" the storages and flows. That is, summing the best estimates
for the flows of carbon to and from the atmosphere indicates that
there is less carbon in the atmosphere than expected. During the
1990′s, the atmosphere was missing about 3 petagrams (3.3 billion
tons) of carbon per year. This missing carbon is associated with an
unknown carbon sink.
[...]    ///

The atmosphere is missing about 3.3 billion tons of carbon per year.
The global carbon cycle is not balanced. Balance is very important. Al
Gore wrote a book, "Earth in Balance". The prime directive of good
accounting practice is to ‘balance the books’. Whether anthropogenic
global greenhouse warming theory is scientifically valid or not, it is
important the return the carbon cycle to balance. Hence it is
imperative to permit (or to encourage) the growth of the carbon
(fossil fuel) economy by 3.3 billion tons of carbon per year. Efforts
to limit the growth of the carbon economy will not help to balance the
carbon cycle and will do more harm than good.

New Study by hkc22.com:

http://www.hkc22.com/flameretardants.html

http://www.hkc22.com/fireprotection.html

Abstract:

Halogen-free Flame retardants market will increase from 1.62 bn US $
in 2005 and to 2.72 bn US $ in 2010 worldwide.  Nanotechnology will
play the key role in improving fire-retardant performance and reducing
production costs.Halogen-free flame retardants show strong increase
worldwide. In Western Europe, USA and Japan, the public consciousness
of the hazardous halgonenated products, the industrial end-user
initiatives and the environmental legislation push together the market
trend to halogen-free products. In China, Eastern Europe and other
parts of Asia, the booming economy and the strengthened fire
protection standards stimulate the market of fire retardants overall,
from which the halogenated and non-halogenated products both
benefit.

The highest increase is to be seen in China with more than 13 percent.
Slightly slow growth in Western Europe and USA, ranging from 9%-11%,
The world market in total will grow from 1.62 bn US $ in 2005 and to
2.72 bn US $ in 2010. The average global annual growth rate is more
than 10%, in comparison with 5% of the general flame retardants
market.

hkc22.com
i…@hkc22.com

Simply Find Your Engineering Job Vacancy and resources here –>
http://www.jobbankdata.com/job-engineering.htm

Many of the aquarium water treatment products use sodium thiosulfate
to remove harmful chlorine/chloramine. But some products also bind the
ammonia that splits from chloramine into a harmless compound, which is
still available to plants and bacteria. Does anyone know what the
chemical is that does this? I would like to make my own water
conditioner. The thiosulfate is easy to get. But I need to know if the
ammonia eliminator chemical is readily available.

Thanks,
Dave

<shazl…@yahoo.com.au> wrote in message

news:1173848469.315387.185210@d57g2000hsg.googlegroups.com…

> I’ve read that Sodium Thiosulfate will dechlorinate your skin and
> hair, after swimming in a chlorinated pool.
> I am trying to find out what conentration of Sodium Thiosulfate
> solution is required to be effective? If possible, please give Grams
> per Litre. If you just give percentages, I won’t know if you’re
> referring to mass percent, volume percent, or molar ratio.
> If I just go by the trial-and-error method, I am just wasting money.
> Thanks.

I suspect that most of the damage to skin and hair by the chlorinating agent
in
swimming pools is already done by the time you get out of the water.

The levels of chlorine, or hypochlorous acid, or whatever, in pools is
usually
in the medium low ppm range.

If you made up a 0.1-1% by weight solution of thiosulfate and rinsed
yourself with it,
it should be plenty enough to do whatever good you could derive from it, I
would
think.

Hi, i met a problem to calculate the current density in the
electroplating. As i know , to calculate the current density, we muz
know what is the current and the electrode surface area that immersed
in the electrolyte. My question is that the electrode used to
calculate the surface area is cathode or anode, or the average of
both? and lets say the surface area of cathode to be plated is used to
calculate, then what if the cathode is more than one. What i mean is i
have to use the average of the srface area of the cathodes or the
total of all cathode surface area??