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2:00 AM
@ringo and @Nicolau I absolutely agree with "LaTeX in titles has always happened and will always happen." And it is not necessarily a bad thing. The biggest problem with it is the mhchem package, as the ce does produce some url slug issues for search engines. See this discussion on meta. [...]
 
Yeah
And hello Martin
 
But there are some more issues than that... It breaks the title on any sites that do not have MathJax installed, which I think is the bigger issue, see here and here. Whenever possible, try to make the title with real words only :D
Hello, how are you today?
Have you had a nice weekend?
 
I'm fine, and you?
Pretty standard weekend for me, but I enjoy staying at home
And yes, I think I spoke poorly earlier trying to make an amusing remark
 
Sometimes those are the best
 
I looove staying home, I could see myself being a hikkikomori in an alternate timeline
 
2:05 AM
Haha ;) I think i get it
@NicolauSakerNeto Japan would therfore be a good home for you ;)
We have a couple of them
 
Perhaps you read that I almost went there for my Master's degree?
 
Yes I remember that...
 
I'd have enjoyed it I think
 
Now you go to oz, which is i think more of the opposite
I believe there is no way someone cannot enjoy Japan
 
I suspect I might end up going if at least for a meeting
Since it's so much closer than Europe or the US
 
2:09 AM
My weekend was awesome, I went to an art event in Tokyo, where I bought a shirt, which says "International Motherf***er" on the front and on the back "Hooray for me and f*** you"
 
Haha the asterisks
 
now it works... hahaha
I don't want to swear here...
I find it inappropriate
 
Professionalism is good
 
But this time it's an exception, as it is a quoute...
 
We understand
 
2:12 AM
It always is, and once you start using strong language, you think more about the language and your rage as opposed to thinking about the argument you would want to make work
 
I can see that being true
 
Have you read the chat guidelines, yet? Please weigh in on the discussion!
3
I posted this for all to see, I'd like it to become faq, so we have a general understanding
 
Looks pretty agreeable
The pinging thing was getting a bit out of hand sometimes
Which is why I rarely do it myself
 
@NicolauSakerNeto It's all too easy telling somebody to go to some far away place, but making her/him understand is hard
I only use it to reply to a specific post, so that the linking shows up in the transcript
The excessive use was what made me include it.
It is a good feature though...
 
Useful, certainly
 
2:19 AM
Yes especially in times where a discussion may go over days, because we are on the other side of the globe, respectively.
 
 
3 hours later…
4:58 AM
We graduated!!!!! and I know I am late.
@santiago @Martin-マーチン @Freddy @ron @MARamezani
 
 
4 hours later…
9:26 AM
lol
-5
Q: Did the Chemistry StackExchange suddenly get a whole lot more interesting?

Damien HI enjoy keeping an eye on the 'hot' network questions bar, since they tend to give an interesting cross-section of questions from a dizzying array of areas. Because of this, I've come to know the little favicons for most of the Exchanges quite well, to where I can pick them by sight without even ...

 
9:58 AM
Yes we have, @santiago!
 
absolutely!
 
@DelPate Better late than never!
How are you santiago? Good weekend?
 
not bad at all, how was your weekend?
 
Mew
hello
can someone help me
well?
 
@Mew just dive in and ask
 
10:08 AM
Sure @Mew, and hi!
 
Mew
I was looking up an organic molecule
and I found two different boiling points
I don't know why they are different
-28
but here:
it is -43
so why are these different?
 
You mean melting point I assume, not boiling point?
 
Mew
sorry i mean melting point not boiling point
 
Well, the easy answer is that they are reported differently because somebody botched an experiment
2
 
Mew
so which one is botched? I have seen sources that quote both results
 
10:13 AM
I'd go with the one that has more sources backing it up
the other one is likely to be wrong
might be that it crystallizes in different ways though
 
Mew
The second link actually is a result of a search I did for molecules with melting points of -28
and it gave me the right molecule, and says melting point is -43, even though i told it to search for those with -28
how accurate are experiments of this nature?
Would the melting point be known with certainty?
 
I'm not an experimentalist, so I can't comment on the reliability of melting point measurements that are below 0 °C
 
@mew The melting point reported at chemspider is for 98% chemical: alfa.com/en/catalog/B20790
 
Mew
what does that mean
^also supports -28
The student I tutor needs an isomer of C5H10O that has melting point of 028
-28
I couldn't find any other isomer that was close except this one
perhaps the teacher has used the incorrect source?
 
Perhaps s/he did, I'd trust this one: webbook.nist.gov/cgi/…
Is it a theoretical approach or practical synthesis?
 
Mew
10:28 AM
it's a simple highschool project where the students have to figure out the molecule C5H10O
and they are given melting point is -28
and bp 98
 
Well, I'd assume that the data is taken from one of the abundant sources
 
Mew
abundant sources?
 
 
3 hours later…
1:06 PM
holla
So apparently Jan Jensen is now a member of our site!
 
1:41 PM
0
Q: On formatting electron configurations

WildcatI usually pay a very high attention to the formatting of anything I write, especially to the mathematical notation, because in my opinion it is really important. Of course, the most important thing in formatting is its consistency, and while in principle everyone is free to follow his own persona...

 
 
1 hour later…
2:57 PM
\o @Waffle'sCrazyPeanut
 
@LordStryker o/
 
long time no see. how you been?
 
waffles says Howdy
@LordStryker Exams and stuff. Got rid of them just a few weeks ago :)
 
Congrats! Any special plans for the summer ?
 
Nope. Stay at home and code the summer away! :P
 
3:00 PM
Like a true nerd. I'm in a similar boat. Work all summer but its what we enjoy so its all good.
 
Nothing special so far in waffle's life
@LordStryker Yeah! I wish my mom sees in that perspective
 
3:17 PM
@Martin-マーチン How was the match?
@Waffle'sCrazyPeanut @LordStryker Hello!
 
\o @user223679
 
@LordStryker What does Stryker mean?
 
no clue.
I need to change this name
unfortunately I've used it for so long changing the name will confuse some people
 
Stryker of Mortal Kombat fame?
 
@LordStryker How did you come up with it then? :p
 
3:21 PM
@NicolauSakerNeto kings of chaos
@user223679 blindly
 
Never heard of that
 
@NicolauSakerNeto Good. Shameful really I don't even like to admit it :P
@Wildcat Nice meta post btw.
 
Greetings!
@LordStryker, hmmm. Which one? :D
 
E. configs
 
Nice post indeed
I'll try to follow it
 
3:32 PM
Or, this one on meta. Thanks.
Is bse.pnl.gov/bse working for anyone?
Why sites are down when you really need them? :D
 
@Wildcat Its down. "Horrible Exception..."
there is a mirror of this site on a european server I believe
 
Haha a horrible exception indeed
 
@LordStryker, yes, the same story for me.
And now it works. But slowly.
God bless the Internet!
 
3:45 PM
ugh I hate it when you try to find a minimum and it keeps opt-ing to a TS with some BS methyl rotation or something
 
4:01 PM
@LordStryker You there?
 
@LordStryker Does inversion happen only in amines?
 
From what I can remember from my O-chem days, any atom with a lone pair in a similar configuration can undergo inversion but in the case of the amine, the energy barrier is low enough that it has been observed experimentally. I wouldn't be surprised if another example has been observed experimentally but I can't say for sure.
 
@LordStryker Oh. Thanks
 
Looks like in the case of phosphorus (isovalent with N), it requires much more energy to undergo inversion. See: cuvillier.de/uploads/preview/public_file/2066/9783869551531.pdf
 
4:12 PM
@LordStryker Is it a good question for the main site or "too broad"?
 
Depends on how you word it. I think it would make for a good question.
 
@LordStryker Hey, the link you provided answers it! The enrgy barrier aint that low in P. And I assume it increases down the group. So in ideal cases, N gives, others don't.
 
Glad it was useful :)
@user223679 you should fill out your profile :)
 
@LordStryker For the autobiographer badge? ;)
 
@user223679 So people like myself know who we're addressing
 
4:18 PM
Just another high schooler @LordStryker
 
they teach nitrogen inversion in high school?
40 more to go before i can finally edit questions and answers again
i hate the rep increases upon graduation :\ I understand why they do it but man its hard to let go of certain things you used to have.
 
@LordStryker Sort of. Well, we need to know that amines dont give optical activity.
@LordStryker 30 ;)
 
4:42 PM
No rules about asking for rep in chat yet. @Martin-マーチン didn't include that in his meta post. Therefore... beg for upboats nao!! ^_^
Upboats to da left!
@tschoppi Typical experimentalists...
 
@LordStryker Only 5 users have access to moderation tools :o
 
@user223679 That isn't surprising to be honest. Takes lots of rep to get there. We had plenty more before graduating.
@Martin-マーチン has 2 more edits to go before he becomes 1337
I wonder where @dissenter has been
That guy has asked so many questions and from what I can remember, they were pretty good questions too.
 
@LordStryker Look at this guy's question to answer ratio :p
 
That is quite incredible. I can never think of many questions to ask :\
 
@Arpan Hello!
 
4:54 PM
heya @Arpan
 
nice!
 
@LordStryker You there? I have one more question.
 
@user223679 hit me
 
Which is kinetically the most stable allotrope of phosphorus?
Red yellow back or white?
@LordStryker
 
5:07 PM
Well, P4 is a very stable structure from what I can remember.
I believe the color is white but let me check to make sure
 
White and yellow are reactive. Black is thermodynamically most stable and about red... no idea.
 
Hmmm
well i suppose if we were to consider a SINGLE P$_4$ molecule, it'd be white phosphorus
red phosphorus is polymeric...
so is black
If we are considering n number of P4 subunits, then I would go with black phosphorus
 
@LordStryker Lets say a lump of each.
 
Lets go with black then. Thermodynamically stable at room temp and pressure...
 
@LordStryker Kinetically? The answer given is Red. No idea why.
 
5:15 PM
according to this page that is correct science.jrank.org/pages/241/Allotrope.html
according to this page Black is the most stable chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/…
 
> The allotropes of phosphorus illustrate the variations in chemical properties that may occur among such forms. White phosphorus, for example, is a waxy white solid that bursts into flame spontaneously when exposed to air. It is also highly toxic. On the other hand, a second allotrope of phosphorus known as red phosphorus is far more stable, does not react with air, and is essentially nontoxic.
Doesnt mention thermo or kinetic.
@LordStryker Rather, none of the pages mention kinetic/thermo. Black is thermo most stable.
 
well what do you mean by stable?
thermodynamically stable? kinetically stable? least reactive? stable at room temp?
 
Thermodynamic and kinetic stability.
 
This reference says black phosphorus is the least reactive books.google.com/…
 
@user223679 , there's a difference in thermodynamic and kinetic
Thermodynamically , the process of conversion of diamond to graphite should be spontaneous, kinetically its not ^^
 
5:21 PM
Thermo--> Black Kinetic--->???
@Mann Yes. I know. My ques is on kinetic. For thermo its black.
 
But I think thermodynamically, black is most stable there is least angular strain
wEll for that you need rates of reaction .-.
There is even ambiguity in saying kinetically stable,
Where did you have that question anyway?
 
@LordStryker But reactivity depends on both kinetic and thermo factors.
 
Yes, but for kinetic factors, you need to consider activation energy
 
This might help. "Bulk crystals of black P are stable
under ambient conditions for at least a few
months" (from: http://www.pnas.org/content/112/15/4523.full.pdf?sid=d4b76ccd-9c5c-409d-a066-6756a1e4d250)
now find a lifetime for red phosphorus
we all know red phosphorus is used for match heads and those can last years
 
They are like measure of kinetic stabilty. More higher the activation energy of intermediate things, lesser the chances for reaction to proceed
Yep haha
Kinetics would depend on pathway of reaction
 
5:25 PM
Its better to post it on the main site :p Someone will know some data about it :)
 
Thermodynamic you just need reactant and product
 
@LordStryker Paywall
 
Look, when I think of stable I think of (in terms of thermodynamics) lowest free energy. If deltaG is negative, then the more stable it is. The larger the magnitude of deltaG, the more stable it is. kinetics simply describes how fast A -> B
 
@LordStryker DeltaG is negative implies spontenietY?
 
yes
lower free energy to me means more stable however
 
5:36 PM
More stable means less spontaneous?
 
as a computational chemist, lower electronic energy means more stable
so look, if deltaG of A--->B is negative, the process is spontaneous (regardless of how slow or fast the process is) because B is more stable
the more spontaneous, the more stable
 
Okay... we are talking about B.
 
@user223679 still my favourite case for that is still diamond to graphite :D Although the gibbs energy change is not so large negative number.
 
Ya. Fine. Looks correct. @LordStryker . But this discussion of deltaG wont help in kinetic stuff.
 
9
Q: Difference between thermodynamic and kinetic stability

CyrusWhat is the difference between thermodynamic and kinetic stability? I'd like a basic explanation, but not too simple. For example, methane does not burn until lit -- why?

 
5:40 PM
@Mann The question target the kinetic nature specifically. Your example is perfect as a counter-intuitive example.
 
To be honest @user223679, nothing is stable at a gazillion degrees Celcius.
its relative
At least that's the answer i'd give. Didn't define a set of conditions? i'll define my own. here you go.
 
@user223679 , if you wanna know the kinetic stability of a substance then you must know PATH of reaction, HOW it is converted and TO WHAT is is converted to AND EVERY ENVIRONMENTAL CONDITION.
Like catalyst etc
 
@Mann That would render the question useless. Anyway, it looks confusing as kinetics deal with reaction mechanism and we dont know which reaction is being taken as the standard. Or in other words, as @LordStryker said, we dont know the conditions :)
 
Exactly
 
@user223679 generally we'd use room temp and pressure as a reference point. Then from that point on, assuming all things equal, you could simply examine the 'lifetime' of a substance and determine its stability
 
5:47 PM
@LordStryker Looks good. But is pure red P used in matchsticks? If yes, then we get our answer.
 
@user223679 Thats the thing, I don't know for sure
I wouldn't ever imagine it being 100% pure on matchheads
 
Time for a new question. And maybe I will ask amine inversion too.
@LordStryker You can answer it based on your half-life theory and we will see what others say.
@LordStryker Do you mind if I post a link to this chat in my question?
 
I do not mind at all.
 
6:20 PM
@LordStryker
0
Q: Which allotrope of phosphorus kinetically the most stable?

user223679I ruled out white and yellow as being quite reactive. Red and black allotropes are both polymeric and comparitively less reactive. Black looks the most stable one thermodynamically. But kinetically, I have no idea whether it should be red or black. The answer provided to me is Red. (Rel...

 
6:36 PM
Looks good!
 
7:29 PM
According to this black is the most inert one.
 
 
4 hours later…
11:30 PM
0
Q: Everyday use of "Everyday Chemistry"

jonscaeveryday-chemisty is a useful way for people to find questions that laypeople might ask about chemistry. It's a bit of a "meta" tag but we can hold (or re-hold) that discussion another time, since I think it does have some utility. It gets abused by new(er) users thinking that it means chemistr...

 

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