Search the web
Sign In
New User? Sign Up
thechemistrycluster · The Chemistry Cluster - A place to talk of the great world of Chemistry...
? Already a member? Sign in to Yahoo!

Yahoo! Groups Tips

Did you know...
Want to share photos of your group with the world? Add a group photo to Flickr.

Best of Y! Groups

   Check them out and nominate your group.
Having problems with message search? Fill out this form to ensure your group is one of the first to be migrated to the new message search system.

Messages

  Messages Help
Advanced
Messages 5885 - 5915 of 13932   Oldest  |  < Older  |  Newer >  |  Newest
Messages: Simplify | Expand   (Group by Topic) Author Sort by Date ^
5885
I almost feel silly asking such a simple question, but could someone please remind me how normality is calculated. It seems like it has something to do with...
Chad
chad_welch
Offline Send Email
Jul 2, 2004
5:18 am
5886
Chad, Normality depends upon the reaction and reactant of interest. From the reference below, Normality (N)is equal to the gram equivalent weight of a solute...
Nathan Haese
nathanhaese
Offline Send Email
Jul 2, 2004
5:46 am
5887
Found this formula for a hair removal product. It includes the ingredient "Horseradish Peroxidase"... what on earth is that? Is there any sort of reaction...
Jago
jago25_98
Offline Send Email
Jul 2, 2004
9:14 am
5888
Hi. There's a product available for £30/month for hair loss called Regaine. Only one that works I think. The active ingredient and the only thing that matters...
Jago
jago25_98
Offline Send Email
Jul 2, 2004
9:38 am
5889
"Normality" or "molarity" refers to the moles per liter concentration of a solute in a solvent, most often water. For example, a solution containing 40...
JohnWW
johnwwxtraconz
Offline Send Email
Jul 2, 2004
9:41 am
5891
You can look up the structure of minoxidil in the merk index or the sigma catalog. The structure can also be found on chemfinder. I know they have minoxidil...
Chris Ross
colorforce2001
Offline Send Email
Jul 2, 2004
10:48 am
5892
You can look up the structure of minoxidil in the merk index or the sigma catalog. The structure can also be found on chemfinder. I know they have minoxidil...
Chris Ross
colorforce2001
Offline Send Email
Jul 2, 2004
11:31 am
5893
Hi, Does anyone know of a simple classical theory that describes the amount of additional stabilisation that an adsorbate receives upon adsorption onto a...
auscience
Offline Send Email
Jul 2, 2004
9:26 pm
5894
Dear Jago: Minoxidil is a compound discovered by a company that we used to call Upjohn in the 1970's. It was originally developed as a powerful oral blood...
Steve
steve_geo1
Offline Send Email
Jul 2, 2004
11:32 pm
5895
i just want to anyone who is knowledgeable of what will be the hybridization of boron if it bonds with flourine or by methyl group. i am confused knowing that...
mharcoh75
Online Now Send Email
Jul 4, 2004
6:47 am
5896
Boron trihalides and trihydride, which are "electron-deficient" moleculesat normal temperatures, dimerize in the anhydrous solid and vapor states to form e.g....
JohnWW
johnwwxtraconz
Offline Send Email
Jul 4, 2004
7:40 am
5897
It is not completely true. Normality and molarity both are different, Both are used to mention concentration but in normality i mole subsatnce dissolved in one...
mukesh jani
mkj15462
Offline Send Email
Jul 4, 2004
1:24 pm
5898
Yes it is true there is sp3 hybridisation in boron trifluoride and trimethy derivatives. sp2 hybridisation is not possible there. If you calculate on the base...
mukesh jani
mkj15462
Offline Send Email
Jul 4, 2004
1:27 pm
5899
Molarity is the number of gram molecular weights of substance in 1 L solution; normality is the number of gram equivalent weights of substance in 1 L solution....
Steve
steve_geo1
Offline Send Email
Jul 4, 2004
3:41 pm
5900
Dear Friends: I feel sure that BH3 actually exists as a dimer, B2H6, with "three-electron bonds." However, BF3 and B(CH3)3 exist as monomers with sp3...
Steve
steve_geo1
Offline Send Email
Jul 4, 2004
9:45 pm
5901
There is no way that they could "exist as monomers with sp3 hybridized bonding". BF3 and BH3 (which can only exist at at temperatures too high for the dimers...
JohnWWW
johnwwxtraconz
Offline Send Email
Jul 4, 2004
10:47 pm
5902
... B2H6, ... single- ... bond ... BH3 does exist as a dimer, B2H6, Steve. It contains two three-center bonds (3 atoms held together by 2 electrons) which, I...
octanediol
Offline
Jul 4, 2004
10:55 pm
5903
Why are people still using normality-it must be at least 30 years out of date? There is another term called formality which I saw in a paper/patent but can't...
Ian Gilmore
calaban10
Offline Send Email
Jul 4, 2004
11:51 pm
5904
Dear Ian: Normality is not out of date. Normality reflects the different equivalent weights of reagents. A 1M solution of hydrochloric acid is 1N. A 1M...
Steve
steve_geo1
Offline Send Email
Jul 5, 2004
2:10 am
5905
The BF3 is consodered to be trigonal planar or sp2 with 120 deg bond angles. There are three electron domains around the boron in VSPER theory so you need...
ag-au
agaubrla
Offline Send Email
Jul 5, 2004
4:17 am
5906
Dear colleagues, Sodium nitrate Sodium Othophosphate Sodium molybdate Ferric chloride EDTA lab grade Silicate gel D-Biotin Cynocobalamine Thaimine...
shailendra Indulkar
indulkarshailu
Offline Send Email
Jul 5, 2004
9:08 am
5907
Yes Steve you are right. Normality is not out of dated. But it is still used widely. Formality is a different thing. Althaugh it is representing concentration,...
mukesh jani
mkj15462
Offline Send Email
Jul 5, 2004
11:57 am
5908
It is changing the PH, which is most important factor for culture development.So appropriate combination of them is require must. Mukesh Jani shailendra...
mukesh jani
mkj15462
Offline Send Email
Jul 5, 2004
12:14 pm
5909
Dear Shailendra: Mukesh is correct. A lot of these chemicals are to buffer the water solution to control pH. Others are nutrients, especially micronutrients,...
Steve
steve_geo1
Offline Send Email
Jul 5, 2004
9:00 pm
5910
The Sodium nitrate, orthophosphate, and molybdate could be used as the basis for colorimetric methods for analysis of nitrate and phosphate in water, through...
JohnWW
johnwwxtraconz
Offline Send Email
Jul 5, 2004
9:08 pm
5911
Dear Shailendra: About biotin: If it is needed, maybe you could buy a less expensive racemic version. The algae will use what they need, and the rest you need...
Steve
steve_geo1
Offline Send Email
Jul 5, 2004
9:08 pm
5912
Hello , Very help full & informative group " Thank you to all members " This algae is use to feed young one of prawns in hatchery ,So a special care is taken...
shailendra Indulkar
indulkarshailu
Offline Send Email
Jul 8, 2004
7:09 am
5913
Dear Shailu: Your question about pH control in algae cultures is too complex for me to answer. I suggest that you get in touch with a nearby university where...
Steve
steve_geo1
Offline Send Email
Jul 8, 2004
3:10 pm
5914
I've been using this web group for about four years. I just graduated from the university of Manchester in England with a 2.1 in chemistry with industrial...
jonashley722
Offline
Jul 9, 2004
4:23 pm
5915
to steve i would like to say thanks about the info. bout the boron i just found out lately that the boron hybridization what im talking about is that ...
Marco de Leon
mharcoh75
Online Now Send Email
Jul 10, 2004
2:06 pm
Messages 5885 - 5915 of 13932   Oldest  |  < Older  |  Newer >  |  Newest
Advanced
Add to My Yahoo!      XML What's This?

Copyright © 2009 Yahoo! Inc. All rights reserved.
Privacy Policy - Terms of Service - Guidelines - Help