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Jan16-12 Greg Bernhardt
chemistry, websites Sticky Thread Pinned: Good chemistry websites ( 1 2 3 ... Last)
I think that these links can be interesting: PeriodicTable: http://www.webelements.com/...
May7-14 10:06 PM
Awheezi
115 140,563
chemical, latex, typeset Sticky Thread Pinned: Chemical LaTeX typeset ( 1 2 3 ... Last)
Physicsforums now has a very cool feature, which enables complex typesetting for formulas or equations! A tutorial...
Jul7-13 04:53 PM
jackmell
64 149,586
Illegal/Dangerous Activities: Explicit "how to" discussions of illegal and/or dangerous activities, or posts...
Jul31-07 05:03 PM
chemisttree
0 39,753
I'm looking for a set of equation(s) to solve the following problem: Given 5 mg of a substance dissolved in 30 ml...
Apr28-14 12:38 PM
adjacent
1 420
I have synthesized nano-hydroxyapatite particles via wet chemistry precipitation of a Ca-PO4 solution. In water and...
Apr28-14 12:00 PM
yesbeckng
1 671
Hello I am working on deriving the expression relating the equilibrium constant K to the change in Gibbs energy. ...
Apr26-14 10:45 PM
Chestermiller
1 470
I was not expecting there to be a reaction between aluminum metal and a solution of iron chloride. I thought the...
Apr26-14 07:27 PM
SteamKing
1 469
I want to know what factors influence the bond enthalpy of a covalent bond and how do those factors influence the bond...
Apr26-14 05:01 AM
Lok
1 612
Hi, first time poster. Here's the scenario. In a given vessel containing a given amount of water at a given temp,...
Apr25-14 07:41 AM
Subrosa
5 507
Please look at this article... ...
Apr24-14 11:07 AM
maltman
5 739
Hi all, couple of questions in the Official IUPAC naming rules for organic compounds: 1. How do I name organic...
Apr24-14 09:19 AM
DrClaude
1 500
In my book it talks about a mercury manometer where one side of the U tube is open to air and the other side is...
Apr23-14 02:24 PM
paisiello2
1 497
My mcat book says temperature is a measure of the total kinetic energy of a system. Then later on it says temperature...
Apr22-14 09:53 AM
adjacent
4 574
My prof says there is no coherent theory regarding activities of solutes, and he's been performing independent...
Apr22-14 01:49 AM
Borek
6 816
"Radium-226 has a half-life of 1,620 years, which means that half of a given sample of radium-226 will decay into lead...
Apr21-14 07:14 AM
DrDu
5 583
I wanted to see how the rate of change of rate constant with temperature (dk/dT) changes with activation energy. I...
Apr20-14 03:53 PM
Big-Daddy
3 565
In transition state theory, the energy of activation (E) shows up in the Arrenhius equation as: k=Ae^(-E/RT). Does...
Apr20-14 09:40 AM
david_w
4 552
Why can't chlorine and bromine form a covalent compound? Colin
Apr20-14 04:12 AM
Colin Cheng
6 476
Why do atoms gain energy when they lose electrons, and why do they lose energy when they gain electrons. The only...
Apr20-14 12:35 AM
Simon Bridge
1 514
In my book they explained that a trigonal planar shape is not good because of the 3 lone pair bond-pair repulsions...
Apr19-14 05:23 AM
sgstudent
4 486
I am reading a chemistry book printed in 1805. The chemical reaction equations are written using the equality symbol =...
Apr18-14 06:04 AM
PhysicoRaj
6 562
Hi, this may seem like a noob question for you geeks out there, but I cant wrap my head around this. The formula for...
Apr17-14 07:01 PM
Ygggdrasil
4 568
Why anhydrous ZnCl2 is required for 1 degree alcohols to convert into alkyl halides? It is a SN2 reaction; so the...
Apr17-14 02:56 AM
Borek
1 455
I am wondering what is the best method to use to extract a compound that is separated by TLC by the liquid extraction...
Apr16-14 03:03 PM
~christina~
2 601
Is the degree of dissociation the value of Alpha when the dissociation begins with 1 mole of the solute, or is it...
Apr15-14 04:48 PM
Borek
11 680
I am in need of help answering a question. I am an environmental geologist faced with the need to comment on...
Apr15-14 03:59 PM
Borek
1 439
I am looking for absorbance spectra and extinction coefficients (molar absorptivities) for common inorganic substances...
Apr15-14 02:11 PM
Yanick
3 415
There are some really really good treatises out there on fractional crystallization, and I'm ploughing through them...
Apr14-14 09:27 PM
Chestermiller
6 534
What I know about galvanic cells is : zinc is the anode and copper is the cathode, zinc loses electrons and it turns...
Apr14-14 08:04 AM
ElmorshedyDr
20 877
Why are precipitation reactions are irreversible as NaCl + AgNO3 --------> AgCl + NaNO3
Apr14-14 01:40 AM
Borek
4 603
Hi all, All three of the equations are in very similar forms. I'm just looking for a source or a basic idea behind...
Apr13-14 04:42 PM
Conservation
0 506
Hello, I was wondering conceptually, why does the density of the individual components change when they are added...
Apr13-14 03:52 PM
ElmorshedyDr
4 901
I saw the thread called Decay/Reactivity of DMSO and it was closed. Since the thread was inconclusive I have decided...
Apr13-14 02:36 AM
Borek
1 441
In a solution of aqua regia (or other acids), if there is a precious metal dissolved, along with other metal ( such as...
Apr13-14 12:07 AM
BernieM
2 433
a 9 L vessel contains 3 moles of helium and 3 moles of nitrogen at a pressure of 10 atm. Maintaining constant...
Apr12-14 05:04 PM
Yanick
2 536
Hello all, I am currently in possession of two chemistry textbooks, Changs and Atkins, which I believe are both...
Apr12-14 04:45 PM
Yanick
2 408
I see why, numerically speaking, deltaGo, defined as deltaGo = - RT ln K or deltaGo = deltaHo - TdeltaSo would be...
Apr12-14 04:42 PM
Yanick
1 408
1 mole of a substance equals the amount of grams needed for that substance to have 6.0221413e+23 (Avogadro's number)...
Apr12-14 03:08 AM
Borek
24 1,068
Hello, I quote from a paper: "...a solution of CuSO4 (1 mM) and NaAsc (2 mM) in 10 mM Tris buffer with 20% DMSO". ...
Apr10-14 01:21 PM
Borek
1 397
Dear all, I got some results from mass spectrometry analysis of liquid samples (I am not really familiar with mass...
Apr10-14 12:31 AM
pippobaudo
2 514
Okay let's say we have water, sodium hydroxide and hydrogen chloride. What do you think is going to happen? Do you...
Apr9-14 02:28 AM
Borek
17 1,215
Hello, So as the end of the year comes to an end, AP Chemistry is getting increasingly more difficult to the point...
Apr9-14 02:24 AM
Borek
2 433
In the word "Ferroelectricity", why has the word "ferro" been used when it has nothing to do with ferrous or iron?
Apr8-14 03:06 PM
Enigman
1 442

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