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Jan
Jan
00:21
0
A: How can I build the molecular orbital diagram of the complex tetraammincopper(II) (square planar structure)?

JanIn principle, it does not matter which central metal you choose and which ligands; if the geometry is identical, the resulting MOs will be identical, too. The problem is as you state that the complex you wish to determine does not have a square-planar geometry (nor is it a tetracoordinated copper...

Monster answer completed \o/
I should have continued working on my script for alphabetic sorting of my list of abbreviations, but …
a script for alphabetic sorting of abbreviations?
Jan
Jan
Absolutely.
The TeX-internal solution was ready for the taking at TeX - LaTeX but looks like it doesn’t scale well …
@ortho ChemDraw.
@Jan nice!
That's a lot of effort
Jan
Jan
I know. I’m so good at procrastination.
Jan
Jan
00:31
Good thing the PI came around to my workplace today and I was actually present. I got stuff done =D
Getting stuff done is always a good thing, just a lot of inertia to overcome :D
It's like a thermodynamic product.
Sadly my life is under kinetic control...
2
Jan
Jan
Must be the cold polar climate.
You would be under thermodynamic control as a caribbean seal …
(Why do I always have to look up which letter is doubled in caribbean?)
Say @Loong, which percentage of your starred posts are xkcd links? xD
@Jan (105 ± 10) %
and I don't even like xkcd
Jan
Jan
Somewhat impressive xD
01:28
How do you find the pH? — Julia 20 secs ago
haha...
Hm, I guess, any homework policy wouldn't change that.
 
3 hours later…
04:42
-1
Q: Gibbs Free Energy for Ideal Gas

MathUser Determine the Gibbs Free Energy for an ideal gas and show that, this energy, and its derivate can be related to the enthalpy of the system via Gibbs-Helmholtz equation $$H=-T^2\left(\dfrac{\partial (G/T)}{\partial T}\right)$$ Hi everyone! this is my first post here, I need determine the Gibb...

I'm not quite sure what this question is asking for ? I don't know what the term "Gibbs Free Energy for an ideal gas" means. What the OP has derived here is the Gibbs Free Energy as a function of pressure, at constant temperature & mole number for an ideal gas. Initially my thoughts were, the OP desired the fundamental relation for an ideal gas in the gibbs free energy representation..
I feel like flag as unclear, but I thought I'd ask here first..
 
2 hours later…
06:21
@Andrew welcome to our chat! 'dichromate' is a polyatomic ion. Meaning, it's not just chromium, but the whole two chromiums plus seven oxygens.
07:08
@orthocresol What is this project you're working on with character tables and group theory and stuff?
07:39
Good afternoon!
Should one capitalize "Propanol" in "2-propanol"?
08:03
@CowperKettle hullo!
And yes, I think
08:14
@CowperKettle You only capitalise compounds/ elements in a title/heading or at the start of a sentence
@Martin-マーチン So if the contents of a table cell in a Word document consist only of "2-Propanol: not more than 0.5%", I should capitalize Propanol?
I thought that the number 2 counts as the starting symbol
hmmm... in a table it's abit different
how do the other entries look like
> Ethyl acetate: not more than 0.5%
Something like this
08:57
@CowperKettle No, unless it's the beginning of the sentence
@CowperKettle Then don't capitalize it
So the figure "2" counts as the first letter in "2-propanol", and no capitalization of "propanol" is needed. Okay
!!flip
ʕ ⊃・ ◡ ・ ʔ⊃︵┻━┻
09:47
@CowperKettle in principle, even in a table, you shouldn't capitalise the compound names
in some publications you might have different rules though
but then you would probably capitalise everything, i.e. Ethyl Acetate...
10:20
@gannex it's just a way to throw away all my "free" time
@CowperKettle The rule is: drop all the numbers and think about whether you would capitalise "propanol". If you would capitalise P in propanol, then capitalise it in 2-propanol. The 2- has no impact on whether P should be capitalised or not.
10:47
@orthocresol Thank you, Ortho!
11:35
Anyway, it should be "propan-2-ol".
3
Indeed! But I'm wary of going as far as to replace the wording used in the Russian text.
So let it be 2-propanol
as long as you don't write "isopropanol", which is really wrong
11:54
> [1-hydroxy-2-(1H-imidazol-1-yl)ethane-1,1-diyl]bis(phosphonic acid)
> (1-hydroxy-2-imidazol-1-yl-1-phosphonoethyl)phosphonic acid
I've found two different "IUPAC names" for Zoledronic acid
I think I'll go with the first one: it is mentioned in Wikipedia
And my text says "monohydrate", so
user116211
0
Q: How can I prove that Gibbs free energy depends on the pressure, temperature and concentration of a system using the Gibbs-Duhem relationship?

Mainak GhoshCan anyone help me with the derivation of the relationship between Gibbs free energy, pressure, temperature and concentration? I cannot find the relationship between Gibbs free energy and Gibbs-Duhem relationship and their relationships with pressure, temperature and concentration.

> [1-hydroxy-2-(1H-imidazol-1-yl)ethane-1,1-diyl]bis(phosphonic acid) monohydrate
user116211
Homework?
Hmm.. dunno
Namaste, Mafia ji
user116211
Hi
12:04
@CowperKettle [1-hydroxy-2-(1⁠_H_-imidazol-1-yl)ethane-1,1-diyl]bis(phosphonic acid) is correct.
12:53
@getafix @ToddMinehardt @MelanieShebel are you three kididng me? :D in which universe does this edit makes the "title more clear"? This title is no question, so no question mark is needed and "Sp5" is simply wrong notation in comparison to "sp5", which is at least a little bit more correct.
If anything would improve the title, then there is need for a new title. But this change is an obvious case for "no improvement whatsoever" ... !!flip/edit
(۶ૈ‡▼益▼)۶ǝpᴉʇ
@pH13-YetanotherPhilipp lol apologies. I don't remember reviewing that edit though haha..must be on autopilot
13:14
@M.A.R. Yeah, reworked the problem again and it made sense :-), and thanks!
What is mechanism ph ch charach. — user37237 4 mins ago
-4
Q: What do you know about Pyridine?

user37237What do you know about Pyridine?

My prof. Asked to make a research about pyridine and i want any one to help me😢 — user37237 8 mins ago
Right, that explains it...
13:45
@orthocresol Have you got no heart..look at the sad, crying emoji
@getafix Hey, hey, I even gave him a suggestion to go to the Wikipedia page...
:p
haha
I've been trying hard to give guidance in comments
yeah i know, i kid of course
Don't worry, I know :DD
I think the success rate is something like 20%
The other 80% gets deleted by Loong after becoming obsolete. :(
13:50
Yeah, unfortunate.
Some of them (no this one of course) have some potential..
I think that's just how it is on SE. There's a barrier to entry.
People don't know how the site works, don't know what it's for, and can't be bothered to read the help centre before asking a question
yeah, sometimes I want to edit questions to improve them but a) I am lazy b) I don't really want to put words in other people's mouths
oh btw, can you remove the room where I had a little chat with Zhe..
oh, okay...
just in case, I am bit paranoid haha
I mean its unlikely people from my university come snooping around here, but you never know.
Yeah... I understand.
13:54
Although, once I do get out of this shit hole, it's gonna make for one helluva blog haha
prepares popcorn
even better, I become famous or something..and someone decides to make a movie about my life, haha
I hate doing algebra..
My statistical physics problem set is so annoying..
> Clarity of solution. A (the? zero article?) 0.2 % solution of the substance in carbon dioxide-free water should be clear.
I'm not sure about article usage here. Maybe it is common practice to just drop them in such descriptions.
14:11
interesting contradictory answers:
4
A: Diels-Alder rate of reaction

ronYes, you are exactly right. Anthracene is better described by this structure (where there are no fixed single and double bonds, but rather a delocalized aromatic structure) than a structure like this (where the single and double bonds are fixed and distinct from one another). So in anthrac...

6
A: Diels Alder with Anthracene and Maleic anhydride

ButtonwoodAs correctly drawn by you, anthracene possesses additional stabilization by resonance, spanning across all three rings. Yet to provide a reason for the observed regioselectivity, it is helpful to draw anthracene's aromatic $\pi{}$-electron system in alternance of single and double bonds. In thi...

and yes, it is generally not acceptable to draw anthracene with such rings
14:27
Does anyone else go to a school that lets undergraduate TA CHEM labs?
My school doesn't let undergrads TA anything.
15:14
@pH13-YetanotherPhilipp - my excuse is that i approved the edit after having some wine :)
@ToddMinehardt @Melanie has made so many helpful edits that it may be tempting to auto-approve. :-)
15:40
@Jan You into climatology, Jan? ;D
@M.A.R. Ah I see you got the hang of it ;)
!!flip
(ノ`Д´)ノ-----┻┻ -3-3
!!flip/@Jan
(╯°ਊ°)╯︵@ᒋɐu
@orthocresol AHA! :D
> Use the solution while fresh. Use the solution freshly prepared.
I wonder which is better. This is the last sentence in a solution preparation procedure
Jan
Jan
16:02
Whaat? Weird questions approaching.
Also you did a thorough search of chat history @Aaron. Why?
16:23
@Loong - agreed :)
hi all
hi Todd
Jan
Jan
Hi Todd o/
hey @Jan!
how goes it?
Jan
Jan
Sluggishly, as always with theses ;)
ugh - i recall those days. my sympathies :)
17:21
> Perform chromatographic runs with 50 μL of the solvent, then with 50 μL of the mobile phase, then with 50 μL of the chromatographic system sensitivity test solution, obtaining 1 chromatogram for each solution. Then obtain 6 chromatograms in 50 μL runs of the reference solution and 3 chromatograms in 50 μL runs of the test solution.
I'm unsure if this paragraph uses the terminology correctly.
Can we say "in 50 mcl runs"?
The alternative would have been to make simple, primitive sentences, but I decided to translate "closer to the original".
18:20
3
A: Why does the equilibrium constant change on scaling the stoichiometric coefficients of a reaction?

A_WoodLet's take the simplest reaction equation $$\ce {A <=> B}$$ In this reaction, your stoichiometric coefficients are simply $$1A:1B$$ Coefficients are the factor you will need to raise your ratio to when you calculate your equilibrium constant. For this reaction, the equilibrium equation would be: ...

Is this an answer?
It's NAA to me
@ToddMinehardt Don't drink and approve edits! xD
2
Jan
Jan
It’s a pretty extensive and verbose way of showing how the relationship OP asks about can be used. Not sure if it has any reason to exist given the other answers …
@Jan But it's not an answer to the why
Jan
Jan
Exactly.
Those moments when you go through your thesis for an entirely different reason and then notice things such as this:
18:36
@Jan Has Stockholm called you yet?
4
Jan
Jan
Still unpublished results.
@Jan Should there be C instead of H?
Jan
Jan
@CowperKettle There should be an N.
Indeed, because C's valency is 4
Woe on me
Ducks in Yekaterinburg.
There is very little space for them that is free of ice
 
3 hours later…
22:08
@Jan I just found an acid with an OH2 in mine ...

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