Newsgroup sci.chem 72526

Articles

Subject: Re: H2S more poisonous than HCN?
From: bpc@netcom.com (Benjamin P. Carter)
Date: Thu, 14 Nov 1996 08:59:40 GMT

As a physicist who doesn't know much about chemistry, I posted a naive
question a while ago:
>> [An instructor said that] a lethal dose of H2S is actually smaller
>> than a lethal dose of HCN.  Is that true?
>>-- 
Following is my attempt to summarize replies I have received.
One e-mail message said yes, H2S is more poisonous in the sense that it
binds more readily with hemoglobin than HCN does.  Another reply (quoted
below) seems to indicate that HCN is the more poisonous gas.  The only
consensus I can find among all replies is that both gases are very
dangerous.  It is perhaps meaningless to say that one is more dangerous
than the other.  They are diffently dangerous.
Off-topic digression: I get the impression that people are more careful
with H2S now than they were when I was in high school (the 1950s).  In
those days, we did experiments that would produce enough H2S to stink up
the whole building. Teachers and students in other classrooms were annoyed
(but not scared) by the odor of H2S. 
In a college class in the 1970s we used thio-something-or-other to generate
sulfide in solution (rather than using H2S gas generators) because (we were
told) H2S is dangerous.  (End of digression.)
Alan \"Uncle Al\" Schwartz  wrote the following,
which seems to indicate that HCN is the more poisonous of the two gases:
>HCN ...  LD50 (30 
>minutes inhalation murine) = 169 ppm;  544 ppm kills in 5 minutes.
Let me see if I understand this.  Does "LD50" mean the Lethal Dose that
will kill 50 per cent of the cute, furry, helpless little critters within
so many minutes?  From "murine", I assume we are killing rats or mice.
>H2S ... LD50 (60 minutes inhalation murine) = 634  ppm ...
If I understand this statement, it takes about twice as long and about
four times the concentration of H2S, compared to HCN, to kill half the
animals.
-- 
    Ben Carter                  internet address: bpc@netcom.com

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Subject: Re: most efficient way to stir a cup of coffee? ... An initial study
From: dmidgett@SunBelt.Net
Date: 14 Nov 1996 04:17:52 GMT

In article <56a5g9$k54@news.isc.rit.edu>,
   adfraser@servtech.com (Andrew Fraser) wrote:
>Provided that the boundaries of your experiment are tightly defined, the most 
>efficient way to stir a cup of coffee is to get someone else to do it.  
>
>This holds true in the case of a point coffee stirring phenomenon.  That is 
to 
>say, the coffee is stirred with no expenditure of coffee-stirring energy 
>("swizzlons") on the part of the consumer of the stirred coffee.  However, in 
>certain environmental conditions, swizzlons can be transformed into either 
>pathetic-look-EMR(PL-MER) or "begging and whining" wave vibration (BW-WV).  
>
>The boundary conditions under which swizzlons will transform into sufficient 
>PL-EMR to stir said object cup of coffee are as yet undefined.  Although, 
>preliminary evidence points to the perception of surface conditions of the 
>coffee consumer by the coffee stirrer.
>
>The transformation of swizzlons into BW-WV is better known although happens 
>less commonly.  As BM-WV in excess, have a tendency to cause a detrimental, 
>even repellent effect on the free swizzlons of BM-WV recipients.  Controlling 
>BM-WV to achieve the desired effect is currently beyond our experimental a
>capabilities.
>
>Open for comments.
Hmmmm.
You are one messed up fellow; however veery amusing.  I believe that S=RC^2.
Meaning swizzlons equals Recipient stiree conditions squared
respectfully (possibly intoxicatedly)
Dave

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Subject: Re: Lab Accidents.......
From: bpc@netcom.com (Benjamin P. Carter)
Date: Thu, 14 Nov 1996 09:30:25 GMT

jwosni1@po-box.mcgill.ca (Jordan Wosnick) writes:
>rwpick01@ldd.net (Randal W. Pick) wrote:
>> ... Here's one of mine (let's hear yours):
>I might as well add one to the list...
Me too.
In high school we were generating oxygen, using potassium chlorate with
manganese dioxide as a catalyst.  We were heating the mixture in test
tubes held over Bunsen burners.  Suddenly there was a loud pop as one of
the test tubes exploded.  The teacher told us to turn off the gas and
leave the room, but three more test tubes exploded before we could comply.
One student who was always talking had his mouth open, as usual, and had
to be taken to a hospital to have many shards of glass removed from the
inside of his mouth.  He was the only casualty.
The teacher later told us what had gone wrong. Someone had been using
charcoal powder in another experiment.  Having some left over, and
deciding that it shouldn't be wasted, he thoughtfully attempted to put it
back where it had come from.  He found a container with dark powder which
he assumed was charcoal, although the label read MnO2.  ...
-- 
    Ben Carter                  internet address: bpc@netcom.com

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Subject: Re: Polyacrylamide "in limbo"
From: Ed Marsden
Date: Thu, 14 Nov 1996 05:02:03 GMT

J C Ford wrote:
> We're trying the B-M digoxygenin sequencing system.  Any experience with
> non-isotopic sequencing (other than automated)?
	As a matter of fact, I'm about to start with the Biorad kit which uses
	the DIG's system of non-radioactive labelling (I understand that the
	primers are pre-labelled and ready to go). In addition, I think that
	they've thrown in Taq polymerase (I've heard better things about Taq as
	compared to Sequenase and the Klenow fragment).
	I actually ran one test gel (38cm x 50cm) the other night after a weekend
	stay in the fridge. I can't really say that all went well because it was the
	first time I had used a sharkstooth comb! :)  (I've usually used squareheads 	
	until now and I might just go back to them yet!) It was sloppy loading to say
	the least...
								Yours,
								Neil

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Subject: hoechst 33258 & 33342
From: Jean Philippe Demaret
Date: Thu, 14 Nov 1996 13:17:52 +0100

Does anyone have informations about the fluorescence
of Hoechst 33258 and 33342 in presence of single-stranded
DNA ? And in presence of proteins ? Thanks.
Dr Jean-Philippe Demaret
L.P.B.C.                                tel : 00.33.1.44.27.27.50
Universite Pierre et Marie Curie        fax : 00.33.1.44.27.75.60
place Jussieu 4 - case 138              email : jph@lpbc.jussieu.fr
F-75252 Paris cedex 05, France

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Subject: FREE pH measurement booklet
From: Bob Conner
Date: 14 Nov 1996 12:30:00 GMT

A free pH booklet is available which contains valuable information on 
basic pH measurement theory, pH measurement techniques, selecting the 
proper pH electrode for a particular application, and a pH  
troubleshooting guide. The booklet is available from Lazar Research Labs. 
Inc. by emailing service@lazarlab.com or faxing 1-213-931-1434.  The 
booklet can also be obtained from the Lazar web site at 
http://www.lazarlab.com

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Subject: Re: Crystal growing
From: dwilkins@orion.polaristel.net (Don Wilkins)
Date: Thu, 14 Nov 1996 12:36:58 GMT

On 13 Nov 1996 10:26:51 GMT, caterham@mail.rmplc.co.uk (Dr harmer)
wrote:
>To any one who knows the answer-
>
>The problem is, that crystals I am growing are not spherical. Why not?. My 
>hypothesis is that the movement of particles in the Surface, so the 
>particles slot into the lattice holes Therefore, it forms the easioest 
>shape, which is cuboid, and not spherical. Is there any evidence to support 
>this theory?
>
Absolutely not and for good reason.
Get a copy of the book
Crystals and Crystal Growing
by
Alan Holden and Phylis Singer
It is so damned old that my copy doesn't have an ISBN number.
It will not only give you an introduction to crystals and crystal
growth but also will give you some good recipes to practice what it
preaches.

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Subject: inert gas fusion and leco carbon
From: wertmd@ttown.apci.com (Mike D. Wert)
Date: 14 Nov 1996 07:38:13 -0500

I would like a BRIEF description of inert gas fusion and leco carbon 
analyses. The basic theory and how it actually is done would be great.
Thanks in advance.
Mike Wert

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Subject: Re: accelerated chemistry
From: Jeffrey Bodwin
Date: Thu, 14 Nov 1996 08:05:36 -0500

On 14 Nov 1996 kathy1022@aol.com wrote:
> 1.  The combustion of a certain amount of carbon produced 125 grams of
> carbon dioxide by the reaction:  C + oxygen ->carbon dioxide.  How many
> grams of carbon were burned?  How do I work this using the true molecular
> formula?
How many carbons do you need to produce each CO2? From the grams of CO2,
you should be able to calculate the number of mols CO2, from this you can
figure out how much carbon you started with in either mols or grams with
the appropriate unit conversion.
> 
> 2.  A truck load of CuSO4 x 5 H2O weighing 3500 Kg could provide how much
> water if it were to be heated as indicated by the equation:  
> CuSO4 x 5 H2O -> CuSO4 +  5 H2O
What's the molecular weight of CuSO4x5H2O? CuSO4? 5H2O? What percent of
the weight of CuSO4x5H2O is water weight?
 -------------------------------**-------------------------------
| Jeffrey J. Bodwin            Don't rub my stomach. When I walk |
| bodwinjj@umich.edu               into a business meeting, do I |
| Just me, not you, not UM.       honk your breasts?-Drew Carey  |
~~~~~~~~~~**~~~~~~~~~**~~~~~~~~~**~~~~~~~~~**~~~~~~~~~**~~~~~~~~~~

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Subject: reference help needed
From: msuob@csv.warwick.ac.uk (RobC)
Date: 14 Nov 1996 11:00:35 -0000

Hello, I have just been assigned the task of writing a 1500 word essay 
with the title "The Assymetric ene reaction".
  My problem is that I know nothing about this reaction and have been 
unable to locate any references to it in my Uni's library.
  Can anyone here point me in the direction of a textbook/paper with
some info on the subject?
Thanks
Rob 2nd year UG Chemist. University of Warwick.

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Subject: Re: CaCO3 <--> CaO + CO2 equilibrium
From: Ken Mantei
Date: Thu, 14 Nov 1996 05:12:41 -0800

Let me try again to address the # degrees of freedom that exist when one starts with
CaCO3(s) and allows the decomposition reaction -> CaO(s) + CO2(g) to equilibrate.
P (# of phases) = 3 certainly. Klass has convinced me that F (# degr of freedom) =1.
> This temperature depends on the (partial CO2) pressure.
> Maybe the 825 C is at a CO2 pressure of 1 bar. At 110 bar the equilibrium is
> moved to 1289 C at which CaCO3 melts (source: Holleman Inorganic Chemistry 1944,
> high school chemistry textbook from Holland). At higher pressures it is therefore 
> meltable. So heating limestone in a closed vacuum (for any non-CO2 gas) vessel 
> leaves only one degree of freedom: temperature.
From Gibbs' phase rule: F+P=C+2, C (# components) must be 2.    (1+3=C+2)
I argued in my previous post that C=1, drawing upon C= s - R - m (-1) from textbook
Physical Chemistry by Alberty and Silbey (1992).  
The "(-1)" applies if ions are present; not applicable here. 
s= # species, clearly 3.
R= number of linearly independent reactions at equilibrium between species, =1 here: 
    CaCO3(s) <-> CaCO3(s) + CO2(g).
I now believe that C=2. so      C= s - R - m  becomes 2= 3 -1 -m  and m must be zero!
The Alberty text says m is the # of "relations between concentrations due to initial
conditions". In my previous post I erred in counting the fact that the number of moles
of CaO(s) must equal number of moles CO2(g) as a restricting relation. I see now that
pure phases must be disregarded because their concentrations do not vary. Here, the
partial pressure of CO2 has no effect on concentrations (more precisely, activities)
in either solid phase.
  So, where Klass feels C=1 and P=2, I feel C=2 and P=3. But I agree F=1 regardless.
     --- Ken   kmantei@wiley.csusb.edu

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Subject: Re: World's second most beautiful syllogism
From: msuob@csv.warwick.ac.uk (RobC)
Date: 14 Nov 1996 13:33:28 -0000

Archimedes Plutonium (Archimedes.Plutonium@dartmouth.edu) wrote:
:   My advice to you is to open your mind. Recognize that there are
: people in the world who are thousands of times smarter than you and
: that when you read my posts, don't jump the gun and think that you are
: correct and I am wrong. Say to yourself, I am reading AP and I can
: learn something new today.
Who is this guy, is he just a tad self important or is it just me?
Rob -2nd year UG chemist. University of Warwick
Tanstaafl

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Subject: "half-melting" of solid electrolytes
From: jstrzelc@chem.utoronto.ca (Jacek Strzelczyk)
Date: Thu, 14 Nov 1996 01:33:37 GMT

Could someone please suggest a reference on the "half-melting" of solod 
electrolytes. I would be most grateful. I do not know what it is. Please reply 
directly to my email (jstrzelc@chem.utoronto.ca). Any hints would be 
appreciated.
Jacek Strzelczyk.
-- 
I am just a simple Pole in a complex plane.

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Subject: Re: World's second most beautiful syllogism
From: David Erwin
Date: 14 Nov 1996 13:51:31 GMT

In sci.math RobC  wrote:
: Archimedes Plutonium (Archimedes.Plutonium@dartmouth.edu) wrote:
: :   My advice to you is to open your mind. Recognize that there are
: : people in the world who are thousands of times smarter than you and
: : that when you read my posts, don't jump the gun and think that you are
: : correct and I am wrong. Say to yourself, I am reading AP and I can
: : learn something new today.
: Who is this guy, is he just a tad self important or is it just me?
: Rob -2nd year UG chemist. University of Warwick
: Tanstaafl
That's just AP. He's our (sci.anything) pet lunatic. Just ignore him.
Dave.

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Subject: Re: Chlorine Dioxide information
From: lamotterd@aol.com
Date: 14 Nov 1996 14:02:12 GMT

Try the"Handbook of Chlorination, 2nd ed., by Geo. Clifford White; Van
Nstrand Reinhold, 1986.

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Subject: Re: Heat Formation of Ammonium Nitrate
From: mpotter@intr.net (Matthew R. Potter)
Date: Thu, 14 Nov 1996 14:44:17 GMT

On Wed, 13 Nov 1996 22:39:01 -0800, Matt Hayes 
wrote:
>Could someone please tell me the heat formation of Ammonium Nitrate?
CRC handbook can tell you that...

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Subject: Re: PATNEWS: Chomsky on India, GATT, Pharmaceutical Patents, 3rd World
From: jaspevacek@mmm.com (John Spevacek)
Date: 14 Nov 1996 14:57:17 GMT

One idea that needs to be included in this is that most patents are 
junk or nearly so!. Some are outright junk (these are the easiest 
patents 
to get, since they really don't even work, and no reasonably 
intelligent 
company would bother filing for it in the first place, thus leaving 
the 
door open for idiots), but most patents are merely small extensions of 
existing technology. These are done so that competitors can get 
around other patents. Very few patents are ever real breakthroughs 
that 
completely change an industry, and even in those cases, it can be 
difficult to real foresee all the future applications of it and 
thereby 
obtain the most complete coverage.
The point of all of this, is that this thread is alot of sound and 
fury 
over very little of importance. The issue is not nearly as important 
as 
all the exagerations and emotional appeals make it out to be.
I will admit that the area of software patents is new to me. This area 
might need seperate addressing. However, this is sci.bio and sci.chem. 
The issues here are completely different.
John

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Subject: Re: PATNEWS: Chomsky on India, GATT, Pharmaceutical Patents, 3rd World
From: jaspevacek@mmm.com (John Spevacek)
Date: 14 Nov 1996 14:52:59 GMT

One idea that needs to be included in this is that most patents are 
junk or nearly so!. Some are outright junk (these are the easiest patents 
to get, since they really don't even work, and no reasonably intelligent 
company would bother filing for it in the first place, thus leaving the 
door open for idiots), but most patents are merely small extensions of 
existing technology. These are done so that competitors can get 
around other patents. Very few patents are ever real breakthroughs that 
completely change an industry, and even in those cases, it can be 
difficult to real foresee all the future applications of it and thereby 
obtain the most complete coverage.
The point of all of this, is that this thread is alot of sound and fury 
over very little of importance. The issue is not nearly as important as 
all the exagerations and emotional appeals make it out to be.
I will admit that the area of software patents is new to me. This area 
might need seperate addressing. However, this is sci.bio and sci.chem. 
The issues here are completely different.
John

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Subject: Re: World's second most beautiful syllogism
From: Mike Herauf
Date: Thu, 14 Nov 1996 06:57:26 -0800

> To quote Dr. Foakes-Jackson (1855-1941) of Cambridge ..."It's no use
> trying to be clever, we are *all* clever here.  Just try to be kind."
> 
> Darla
> ---who hereby thanks her brave champions, both public and private.
Hooray for you Darla. You know now, that you are damned to the river
Styx or something like that now, don't you? Archie Pootonium is quite a
(dishwasher) character. He hates anyone who disagrees with his
"theories", which are obviously idiotic, and have been proven so. They
carry no weight or importance here.
However, A.P. is quite intelligent. If you get him to coverse on a
worthwhile subject, he can be quite interesting and resourceful.
As far as his attacks upon you, forget them.
Mike
P.S. 
Welcome to the club

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Subject: [q]info. of daily used chemicals.
From: lsjun@plaza.snu.ac.kr ()
Date: 14 Nov 1996 15:25:14 GMT

Dear all:
 Our lab make use of following famous chemicals daily.
I'd like to know how much is it toxic to our members...
As I heard from unkown some information, acetone can 
bring some cancers to human being.. 
Is it right..?
Acetone, Methanol, HF, TCE etc..
Please tell me...
The purpose of this question is to feel..
--
Lee, Sungjun : lsjun@plaza.snu.ac.kr

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Subject: Iron Removal from Ground Water
From: "Penn Color"
Date: 14 Nov 1996 15:33:21 GMT

Does anybody know a method for the removal of soluble iron from a water
system.  I have already looked at precipitating the ferrous iron to ferric
iron by introducing a oxidizing agent to fluid stream.  These methods are
good but expensive.
The influent concentration is 25ppm & the flow is 40gpm
Sean M. Donovan
Penn Environmental & Remediation, Inc.
215-997-9000
seanski@enter.net

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Subject: RE: Ferric Hydroxide
From: "Penn Color"
Date: 14 Nov 1996 15:29:06 GMT

I am trying to find out a way to dispose of Ferric Hydroxide that was
precipitated from ground water.  I understand that sewage treatment plants
will accept this material to use it as a flocculant in their settling
processes.
Sean M. Donovan
Penn Environmental & Remediation, Inc.
215-997-9000

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Subject: Re: accelerated chemistry
From: Alan \"Uncle Al\" Schwartz
Date: 14 Nov 1996 15:59:10 GMT

kathy1022@aol.com wrote:
>1.  The combustion of a certain amount of carbon produced 125 grams of
>carbon dioxide by the reaction:  C + oxygen ->carbon dioxide.  How many
>grams of carbon were burned?  How do I work this using the true molecular
>formula?
>
>2.  A truck load of CuSO4 x 5 H2O weighing 3500 Kg could provide how much
>water if it were to be heated as indicated by the equation:  
>CuSO4 x 5 H2O -> CuSO4 +  5 H2O
>
>Please help asap.  Kathy
Convert mass to moles.  Get your atomic and molecular ratios.  Convert 
moles to mass.
It is a common misconception that education's goals are to transfer the 
process and substance of knowlege to students.  Education also serves to 
separate those who can learn those who cannot.  Do not waste resources 
upon those who through organic circumstance or personal choice are due to 
be expunged by the evoluton of their species.
-- 
Alan "Uncle Al" Schwartz
UncleAl0@ix.netcom.com ("zero" before @)
http://www.ultra.net.au/~wisby/uncleal.htm
 (Toxic URL! Unsafe for children, Democrats, and most mammals)
"Quis custodiet ipsos custodes?"  The Net!

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Subject: Re: Heat Formation of Ammonium Nitrate
From: Eli Freedman
Date: Thu, 14 Nov 1996 11:03:03 -0500

On Wed, 13 Nov 1996, Matt Hayes wrote:
> Could someone please tell me the heat formation of Ammonium Nitrate?
> 
According to Wagman et al., *The NBS tables of chemical thermodynamic
properties ...* (1982), the enthalpy of formation of crystalline NH4NO3 at
298.15 K is -365.56 kJ/mol.

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Subject: Major androgen in human urine
From: jzhou@nyx.cs.du.edu
Date: 14 Nov 1996 09:21:40 -0700

What's the major androgen in human urine? I did try to look up some books
but was overwhelmed by the name of those steroids. Thanks for help.

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Subject: Help - Agar Supplier
From: "Jeff"
Date: 14 Nov 1996 16:14:52 GMT

Can anyone tell me if there is a "Tech" grade or inexpensive source of
agar?  The only place I have been able to find it is with Chem suppliers
like Fisher and Sigma.  The cost there is about $70 per pound.  I gon't
need it for bacterial growth, I am interested in its gelling properties. 
Or can anyone help me find an alternative for agar.  Gels x-linked with
borax don't work for my application.
Thanks 
Jeff

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Subject: Re: HPLC problem; any troubleshooters out there?
From: rwohleb@chrom.com (Robert H. Wohleb, Ph.D.)
Date: Thu, 14 Nov 1996 16:24:21 GMT

You might also try posting to the non commercial �Interactive
Chromatography Forum�. The forum may be reached through
http://www.chrom.com
############################################################
"wisemen learn more from fools than fools from the wise"
Robert H. Wohleb, Ph.D.             e-mail  rwohleb@chrom.com
Chromatix Separation Sciences, Inc. http://www.chrom.com
91 Church Street, Unit F            Voice: (209) 267-9400  
Sutter Creek, CA 95685              Fax:   (209) 267-9404
############################################################

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Subject: Re: World's second most beautiful syllogism
From: didla@liverpool.ac.uk (Mr D.F. Steele)
Date: Thu, 14 Nov 1996 16:17:56 GMT

Archimedes Plutonium (Archimedes.Plutonium@dartmouth.edu) wrote:
:   Since all things are made up of atoms, implies that the whole itself
: is one of those atoms.   
A library is made up of books, so a library is a book.
Where I come from, we call this sort of thing 'bollocks'.
Fraser

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Subject: Effect of nitric acid on Aluminum
From: Peter Joyce
Date: Thu, 14 Nov 1996 11:29:10 +0000

I'm considering using nitric acid to dissolve some epoxy resin off some
aluminum tools used in composite molding but I wanted to check the
possible side effects on the Al tools first.  Can anyone tell me the
effects of soaking 6061 Al in nitric acid?  Will it attack the metal? 
the surfacer finish?  What might be a better way to remove the epoxy
without harming the Al?  We have already wasted alot of energy on
mechanical methods of removal but that takes alot of energy and tends to
damage the tool.
Any suggestions please contact me via email pjj@mail.utexas.edu
Thanks
-- 
Peter Joyce, Graduate Research Assistant
Mat. Sci & Engr., UT-Austin
Austin, Texas U.S.A.  78712
phone/fax:  (512)-471-5723
internet:  
WWW:  http://www.me.utexas.edu/~impctlab/about_us/about_pjj

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Subject: Chemical & Biological Lab Inventory Consultant
From: "Marshall L. Beeber"
Date: 14 Nov 1996 16:26:13 GMT

As a chemical and biological laboratory inventory control consultant, 
I am offering an IBM-PC compatable Windows based inventory database 
service with item barcoding, CAS number and MSDS documentation. See 
the website below for the inventory software I am using (My service 
does not provide this software): http://www.windowchem.com/12080.htm 
I am working primarily in the Pennsylvania, NJ and Delaware areas, but  
will travel to your desired site at extra expense.  A partial 
inventory is also available, where I'll construct your database from 
the inventory list sent me.  
For further information call Marshall Beeber at 610-948-9480, fax 
610-948-9566, or email me at mbeeber@voicenet.com.

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Subject: Re: HELP!!!
From: dtaylor+@pitt.edu (Darryl C Taylor)
Date: 14 Nov 1996 21:05:45 GMT

Not toluene (notice the spelling).  That would not likely be in the kitchen.  If
it smells like nail polish remover it is probably acetone.  Why would a rooster
drink it though?  I sure wouldn't.
-- 
_______________________________________________________________________________
Darryl Taylor, Systems Analyst			  Phone: (412) 624-2977
CIS - Consulting and Training Services            Email: dtaylor+@pitt.edu
University of Pittsburgh
_______________________________________________________________________________

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Subject: Re: Q. Industrial preparation method of Triethylaluminium.
From: thweatt@prairie.nodak.edu (Superdave the Wonderchemist)
Date: 14 Nov 1996 16:51:17 GMT

bodie@worldaccess.nl wrote:
: Hello,
: For one of my school assignments I would like to get help on the following 
: matter:
: Industrial preparation method of Triethylaluminium
: Relevant reaction equation
: Applications of the product
: Scale of production of the product, worldwide and per production plant
: Process flow sheet
: Process description
: Available literature
: Many Thanks,
: Judith van Heteren
Judith, according to Elschenbroich and Salzer, _Organometallics_, 2nd 
edition, Verllagsgesellscaft mbH, Weinheim, Germany, 1992, pp. 75-76 
there are several industrial processes for making triethylaluminum.
Here's one:
Al + 1.5 H2 + 3 CH2C(CH3)2 (isobutene) ---(1OO deg. C., 200 bar press.)--
									|
									|
		---------------------------------------------------------
	        |
		|
		--> triisobutylaluminum + CH2CH2 (ethylene)
					|
					|
		-------------------------
		|
		|
		--> triethylaluminum + isobutene
triethylaluminum = (CH3CH2)3Al, but it is a dimer in solution as well as 
in the solid form.  A bottle of triethyl aluminum should NEVER be opened 
in the presence of oxygen or water.  It must be handled under nitrogen!  
If you expose it to the air, it instantly lights on fire in a very 
impressive manner.  The journals: _Organometallics_, _Inorganic 
Chemistry_, and the new journal _Journal of Main Group Chemistry_ should 
be a good place to start, _Organometallics_ has tons of stuff on 
organoaluminum chemistry and is an excellent cure for insomnia as well!!!
-Superdave The Wonderchemist

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Subject: Help with Molecule
From: Ross MacKenzie
Date: Thu, 14 Nov 1996 12:44:59 -0600

This is a multi-part message in MIME format. --------------72DC49AB2123 Content-Type: text/html; charset=us-ascii; name="molecul2.htm" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="molecul2.htm" Content-Base: "file:///C|/DATA/JUDY/molecul2.htm"

Does anyone know the IUPAC name of this organic molecule? So far, I know that its "formula" is C₇H₁₂O₄ and that it has a molecular weight of approximately 160.17. I also know it is a cis isomer with some type of stereo-isomerism. It may be some type of alcohol, ether, or dioxol. Its name could contain some type of dimethyl, tetrahydrofuran, or "oxy." I have already consulted the Chemical Abstracts (the chemical substances index portion) book where I found four pages of possible matches. Any information or suggestions as to how to go about naming this compound (or help in further narrowing down my search) would be greatly appreciated. --------------72DC49AB2123 Content-Type: image/jpeg; name="molecule.jpg" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="molecule.jpg" /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRof Hh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwh MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAAR CAXdBGYDASIAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAA AgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkK FhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWG h4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl 5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREA AgECBAQDBAcFBAQAAQJ3AAECAxEEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYk 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iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo 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iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo 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iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACi iigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoooo AKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooA//Z --------------72DC49AB2123--

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Subject: HYDRON
From: "Jeff"
Date: 14 Nov 1996 21:48:54 GMT

Is anyone familiar with a product called HYDRON.  It is a methacrylate
polymer.  I am trying to find the supplier for this material or something
like it.
Thanks 
Jeff

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Subject: Re: [Q] Does limestone violate the Gibbs Phases rule ?
From: dtaylor+@pitt.edu (Darryl C Taylor)
Date: 14 Nov 1996 21:40:51 GMT

In article <5675pm$65t@news.knoware.nl>, C++ Freak  writes:
>
> 
> This seems to be wrong, as there is only ONE degree: each temperature of
> equilibrium belongs to a given pressure. Above the temp the equilibrium 
> shifts to the right and below to the left of the above reaction.
> At atmospheric CO2 pressure it is 900 C.
> 
> Is limestone an exception ?
> What is wrong here ?
> 
> 
> Klaas
> 
I *think* the trouble you are having is caused by a misconception that you may
have regarding the Gibbs Phase Law.  It refers to the number of variables you
need to specify to completely specify a problem.  Sure Temp and Pressure are
linked but you cannot assume that you know the pressure based solely on the
temp.  What if I pumped in 3000 psi of He when you had your back turned?  It
would act only to increase the pressure but it would really bugger up your
equilibrium calc.  In this case Gibbs says you need three.  Temp, Press, and say
something like partial pressure of CO2 in the gas phase aught to work.
Darryl
-- 
_______________________________________________________________________________
Darryl Taylor, Systems Analyst			  Phone: (412) 624-2977
CIS - Consulting and Training Services            Email: dtaylor+@pitt.edu
University of Pittsburgh
_______________________________________________________________________________

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Subject: Re: [Q] Does limestone violate the Gibbs Phases rule ?
From: dtaylor+@pitt.edu (Darryl C Taylor)
Date: 14 Nov 1996 21:40:51 GMT

In article <5675pm$65t@news.knoware.nl>, C++ Freak  writes:
>
> 
> This seems to be wrong, as there is only ONE degree: each temperature of
> equilibrium belongs to a given pressure. Above the temp the equilibrium 
> shifts to the right and below to the left of the above reaction.
> At atmospheric CO2 pressure it is 900 C.
> 
> Is limestone an exception ?
> What is wrong here ?
> 
> 
> Klaas
> 
I *think* the trouble you are having is caused by a misconception that you may
have regarding the Gibbs Phase Law.  It refers to the number of variables you
need to specify to completely specify a problem.  Sure Temp and Pressure are
linked but you cannot assume that you know the pressure based solely on the
temp.  What if I pumped in 3000 psi of He when you had your back turned?  It
would act only to increase the pressure but it would really bugger up your
equilibrium calc.  In this case Gibbs says you need three.  Temp, Press, and say
something like partial pressure of CO2 in the gas phase aught to work.
Darryl
-- 
_______________________________________________________________________________
Darryl Taylor, Systems Analyst			  Phone: (412) 624-2977
CIS - Consulting and Training Services            Email: dtaylor+@pitt.edu
University of Pittsburgh
_______________________________________________________________________________

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Subject: Enthalpy of formation of methane hexahydrate (CH4.6H2O) ?
From: Eli Freedman
Date: Thu, 14 Nov 1996 17:40:16 -0500

Can someone please post the enthalpy of formation of CH4.6H2O ?
Apparently this datum was reported by Y. Handa in *Chem. Thermodyn.*, vol
18, p. 915 (1986), but I don't have access to this journal.

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Subject: Re: [q]info. of daily used chemicals.
From: af524@FreeNet.Carleton.CA (Stewart Rowe)
Date: 14 Nov 1996 20:18:20 GMT

 (lsjun@plaza.snu.ac.kr) writes:
> Dear all:
> 
>  Our lab make use of following famous chemicals daily.
> I'd like to know how much is it toxic to our members...
> As I heard from unkown some information, acetone can 
> bring some cancers to human being.. 
> Is it right..?
> 
> Acetone, Methanol, HF, TCE etc..
> 
> Please tell me...
> 
> The purpose of this question is to feel..
> 
> 
> 
> --
> 
> Lee, Sungjun : lsjun@plaza.snu.ac.kr
> 
First, acetone and methanol are flammable, so flame and possibly 
explosion hazard exist. They should be used in a properly-designed 
fume hood. Both are hazardous to inhale.
Hydrofluoric acid or HF is corrosive to skin, metals and glass. 
Use extreme care. US regulations limit average 8-hour exposure to 
3 parts per million; 30 ppm is "immediately dangerous to life and health".
For methanol, the corresponging limits are 200 ppm and 4000 ppm. 
For acetone, 250 ppm and 20,000 ppm.
If "TCE" indicate trichloroethylene, it is a carcinogen. 8-hour average
exposure should not exceed 25 ppm.
	Stewart Rowe srowe@tso.cin.ix.net

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Subject: Sterol standards for GC/coprostanol
From: "Edward D. Hudson"
Date: Thu, 14 Nov 1996 18:29:29 -0330

Dear All,
	Does anyone out there know if anyone offers a mixed sterol
standard suitable for GC (either in the free or TMS ether forms)?  
I'm looking at analysing sediment trap samples to determine 
quantities of individual sterols.  I could make up a standard 
from pure individual sterols, but if someone offers a ready-made
mixed standard, it would be easier.  Thanks in advance.
	While I'm at it- anyone know if there was ever a "last word"
in the debate on the value of coprostanol as a fecal marker?  (Some
report it as an unambiguous sewage marker, others say it may also be 
formed by bacterial delta-5 hydrogenation in sediments/sinking 
particles, still others try to get around this by quoting ratios of
coprostanol to other sterols, etc., etc. )
Thank you.  Cheers,
			Ed  :)
Ed Hudson
Department of Chemistry
Memorial University of Newfoundland
St. John's, NF A1B 3X7, Canada

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Subject: Re: help with science fair
From: charliew@hal-pc.org (charliew)
Date: Thu, 14 Nov 96 23:05:16 GMT

In article <3289B22C.69AB@cse.uta.edu>, Jeff 
 wrote:
>charliew wrote:
>> 
>> In article <32815f1f.3160726@netnews.worldnet.att.net>,
>>    mangoman@hotmail.com () wrote:
>[good stuff deleted]
>
>I really think the previous suggestion is very good.
Thanks.  As I stated in my original post, I actually judged 
a student's project in which she had done this exact thing. 
As I recall, she was an 8th grader, and her project looked 
much better than most, both in concept and results.
>
>In addition to what charliew wrote, let me add a few
>more 2 cents to make it even more attractive.
>
>Say you would be using a color film of ISO 100
>(processing black and white is more expensive
>nowaday.) The camera lens is at 28 mm to 35 mm.
>Find the best looking sence in town 15-20 minutes
>after sunset.
>
>You could first try using F-stop at B (which is for
>a long exposure) with the apture at 2 or less than 3.5
>for 4 seconds.  Then take another one with apture at 16 
>or 32 for 8 seconds.  The result from a 16 or 32 will
>have extra soft fussing of light surrounding the light 
>source and creating a nice soft looking picutre.
>
>If the background had traffic, it will be even more
>beautiful as streams of lights lay across the picture.
>
>Good luck on it;  it requires trail and error.
>Don't forget your tripoid, too.
>
>Back to my data net exam study. :(

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