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Hot nitric acid (HNQ)
Hot nitric acid (HNQ)
12:17 AM
2
Q: Why does the viscosity of honey decrease when mixed with other viscous fluids?

SuperWild1In order to make honey mustard, I mix honey and mustard. But the resulting mixture is less viscous then both honey and mustard. How does mixing two viscous substances give a less viscous one?

viscosity
 
 
7 hours later…
Bounty Hunter
Bounty Hunter
7:09 AM
3
Q: Reaction of glucose with 2,4-dinitrophenylhydrazine (DNPH)

Manish BhattIn its open-chain form, glucose possesses an aldehyde group; however, glucose does not test positive with 2,4-dinitrophenylhydrazine (which typically forms a yellow/orange/red precipitate with carbonyl compounds). Why is this so? Is this a reflection of the cyclic hemiacetal form (where the alde...

biochemistry carbonyl-compounds
 
 
3 hours later…
Jan
Jan
10:36 AM
Hello Table. Did I miss anything?
 
 
3 hours later…
M.A.R.
M.A.R.
1:06 PM
@Jan No, just that ^
 
Jan
Jan
@M.A.R. Hahaha
 
M.A.R.
M.A.R.
The web NEEDS to know
@Jan So, how're you doing? How's life?
As a PhD?
Do you meet students as annoying as me, or do you not teach?
 
Jan
Jan
@M.A.R. I wish I taught. I had students in the previous lab for as long as two weeks apiece but then they either were reassigned or their short stay was over.
Life is … well, I’m looking for a job while my former boss apparantly had an open favour with another professor at the group, so I’m synthesising OLED materials. Pretty boring syntheses but at least they work.
@M.A.R. How abotu yours?
 
M.A.R.
M.A.R.
1:23 PM
@Jan Meh. University.
Stupid professors, good professors, awesome professors in unrelated topics you wish you could study more
And we have this one professor that's just, really awesome. He'd make the top 5 human beings I've met in my life so far.
You know, the kind of guy that's so nice you somehow don't even care how much they know anymore, their attitude is blindingly great.
 
Jan
Jan
That’s nice; meeting one of one’s top five people is good ^^
@M.A.R. Isn’t this the point where old man me says ‘my, how they’ve grown!’, because I remembered you being in school?
 
M.A.R.
M.A.R.
@Jan that's exactly it, prof. Jan P. Orphyrin
My parents still keep reminding me of it.
 
Jan
Jan
@M.A.R. I’m glad I remembered that. I forget things at my age, you see …
 
M.A.R.
M.A.R.
Hey if someone hasn't met you they'd think you're 30 or something.
 
Jan
Jan
Good lord, so old!
 
M.A.R.
M.A.R.
1:29 PM
Meh, let it go and sip green tea
Make Noah jealous
 
Jan
Jan
I haven’t had green tea in a while. This lab doesn’t have hot water for the taking D=
 
M.A.R.
M.A.R.
Pretend a reaction needs 100 degrees C.
Go make amides or something.
See, my organochem knowledge is flowing.
 
Jan
Jan
I do Buchwald couplings in refluxing toluene.
Although I don’t exactly reflux; I use a sealed tube.
 
M.A.R.
M.A.R.
And you don't do Buchwald couplings, it's just a Christian wedding
 
Jan
Jan
ಠ_ಠ
 
M.A.R.
M.A.R.
1:33 PM
Well, I've just recently entered a real-ish lab.
So far, we have performed the very hard tasks of calculating boiling points, watching drops titrate the hell out of an Erlenflask
and calculating density. Let's not forget about it.
I'm so good. I need to award myself with something.
 
Jan
Jan
Nice; our first experiment in the first year of undergrad was boiling water on the Bunsen burner flame without it bubbling out.
 
M.A.R.
M.A.R.
Uh
Did it involve magic
I'm just waiting for the magic part to show up
Oh, and BTW, we ruined a considerable amount of salicylic acid proving that water is not that awesome.
 
Jan
Jan
Nice, well done.
Speaking of magic, I still have to clean and neutralise stuff D=
And I hit the rep cap today. Woooo~
 
M.A.R.
M.A.R.
And you're out of mana?
 
Jan
Jan
Who needs mana if you can just use palladium cats instead?
 
M.A.R.
M.A.R.
1:43 PM
So you are a cat. person
 
Jan
Jan
No. Not a Pd cat. person.
 
Martin - マーチン
Martin - マーチン
ಠ_ಠ
 
Jan
Jan
Hi Mart o/
 
Martin - マーチン
Martin - マーチン
o/
How's everything going?
(Sorry, not going through a mile of transcript now...)
 
Jan
Jan
Into the organic waste collector
Come on that’s not even a lot :D
But yeah, good enough, still no job, the trip to Germany ripped a major hole into my budget.
 
Martin - マーチン
Martin - マーチン
1:56 PM
I can imagine...
samesies here..
now I'm looking, and looking, and writing stuff and whatever...
 
Jan
Jan
@Martin-マーチン (But you don’t even know the stupid mistakes I made … Well, w/e)
@Martin-マーチン Good luck to you!
 
Martin - マーチン
Martin - マーチン
Good luck to you, too!
@Jan You've told me some rather interesting stories...
 
Jan
Jan
@Martin-マーチン Yes, but it got better …
 
Martin - マーチン
Martin - マーチン
oh, well, that doesn't sound too good
 
Jan
Jan
Absolutely not!
I still need to draw up a final tally. Although I used the dad’s credit card joker at least once …
 
Martin - マーチン
Martin - マーチン
2:02 PM
Oh well, that surely is never a good sign
 
M.A.R.
M.A.R.
2:14 PM
Hey @Mart, hybridization doesn't happen IRL, right?
 
Martin - マーチン
Martin - マーチン
hi! No-one knows O.ô
 
M.A.R.
M.A.R.
Today I told the class it doesn't and I got a meaningful grin from the prof. which ranged from "Smartass" to "WTF is he on about".
 
Jan
Jan
Maybe if you two came close enough together and hugged you would hybridise into two M.A.R.tins?
 
M.A.R.
M.A.R.
Now that's hybridized
 
Martin - マーチン
Martin - マーチン
It is a model system, so since you don't need to employ it to get the same answer, you could infer that it doesn't happen IRL
 
M.A.R.
M.A.R.
2:16 PM
Can experimental data confirm whether electrons get excited?
 
Martin - マーチン
Martin - マーチン
Yes, it's called spectroscopy
 
Jan
Jan
It works best if you tell them you have a present for them.
 
M.A.R.
M.A.R.
So, lemme rephrase. Does it?
 
Martin - マーチン
Martin - マーチン
Electrons get really excited and then they start jumping around. When they are done, they return to their ground state.
 
M.A.R.
M.A.R.
Aha.
Having German professors troll you is a unique life experience.
 
Martin - マーチン
Martin - マーチン
2:18 PM
No, it doesn't. With experimental data we can only confirm electron density.
The wave function is not an observable quantity. We don't know what it looks like.
 
M.A.R.
M.A.R.
OK. I call fake. WE ARE YOUNGSTERS AND WE THINK ADULT WORLD IS FAKE.
 
Jan
Jan
My world is certainly fake, so I’ll clean up the fake lab nao!
 
Martin - マーチン
Martin - マーチン
Quantum chemistry is essentially guessing the wave function with different techniques and then testing if it fits the observable quantities.
@M.A.R. also: Not a professor.
 
M.A.R.
M.A.R.
Sure. I guess whichever model predicts the best is more awesomerest.
@Martin-マーチン OK, doc? Mr.?
Sir?
It'd probably be weird for me to still be calling you @Mart
 
Martin - マーチン
Martin - マーチン
Well in the limits of molecular orbitals, hybridisation is one possibility, but not the only one.
I'm fine with Martin. That's plain and simple.
 
M.A.R.
M.A.R.
2:21 PM
And it's a function of geometry?
 
Martin - マーチン
Martin - マーチン
@M.A.R. Nothing strange at all.
@M.A.R. huh?
hybridisation?
 
M.A.R.
M.A.R.
I read somewhere that the hybridization arguments for Gen. Chem are post hoc. Chemists rationalize geometry with hybridization and we apply it the opposite way
 
Martin - マーチン
Martin - マーチン
And don't say geometry, when you refer to molecular structure.
@M.A.R. Yes, that is correct.
 
M.A.R.
M.A.R.
Well, I'm just recalling a few things. Sentence fragments from here and there.
@Martin-マーチン OK, cool. Let's post a cat gif.
 
Martin - マーチン
Martin - マーチン
The molecular structure is determined by many factors: Attraction and repulsion, covalent and ionic and non-covalent interactions. Orbitals can be used as a model to predict an optimal structure (global minimum) or a intermediate (or conformer, etc.). But how these orbitals look like, is nothing we really know.
 
M.A.R.
M.A.R.
2:30 PM
@Martin-マーチン OK, good reminder. So out of the different models, whichever predicts the reaction the best is more favorable, right? So is hybridization better or worse than the other, competing models or are there inconsistencies for all of them?
TBH, I'm not entirely sure what the competing models comprise of, really.
Everything seems to be applied to everything.
At the same time.
 
Martin - マーチン
Martin - マーチン
Hybridisation is not a complete theory.
Essentially there are two models: Valence Bond Theory (uses hybridisation) and Molecular Orbital theory (doesn't use hybridisation). These are the popular ones, and they do a rather good job at explaining and predicting things.
When they are done in a way that the solutions are complete, then both models produce the same solution.
 
M.A.R.
M.A.R.
@Martin-マーチン What I'm trying to understand is, on what basis do criticisms become valid? Say, they say d-orbital involvement is SF6 to computed to be less than what the hybridized models suggest. Does this have consequences in, for instance, bond length, or were later calculations simply inconsistent with d expansion?
Like, how @ortho hates everything d.
 
Martin - マーチン
Martin - マーチン
Unfortunately, hybridisation often gets taught as a complete theory with the ability to predict things. That is wrong. Also often this is called Valence Bond theory, but it is not. In organic chemistry some people use a weird hybrid of the two theories, kind of like cherry picking. In a simplified way this might work, often enough it shouldn't because it works due to error cancellation and stuff...
@M.A.R. the results were inconsistent with the expectation
 
M.A.R.
M.A.R.
The other one about transition complexes makes more sense since it's a shaky argument of assuming excitation to a higher energy d-orbital works (or are they the same argument?) but the rebuttal for sp3d2 has simply been "No, doesn't work"
Is this the part where I throw my hands in the air with a "Oh my God, quantum chem is even WORSE than organochem"? :P
 
Martin - マーチン
Martin - マーチン
It's mainly wrong because the bonds are not predominantly covalent.
 
M.A.R.
M.A.R.
2:39 PM
@Martin-マーチン Exxxactly. Organochem has a tendency of teaching quantum and thermodynamics in its own weird way that keeps getting me confused.
That "methanol is more acidic than water" is magnificently confusing if you don't dig deep enough
 
Martin - マーチン
Martin - マーチン
y this never works ;(
 
M.A.R.
M.A.R.
@Martin-マーチン If it's a link to an image, use a reply arrow and an exclamation mark right before the link
 
Martin - マーチン
Martin - マーチン
nah it's not a link to an image...
they only allow those share links on tenor
garbage site...
 
M.A.R.
M.A.R.
Well, it's normally blocked so I don't explore it
 
Martin - マーチン
Martin - マーチン
lemme just delete that...
 
M.A.R.
M.A.R.
2:44 PM
So, in conclusion
Was it a "smartass" grin or "WTF is he on about" grin
 
Martin - マーチン
Martin - マーチン
How would I know; I don't know, what the guy knows, and whether he knows what he should know, or whether he only knows the wrong things.
 
M.A.R.
M.A.R.
@Martin-マーチン So, what's up on your side of the world?
 
Martin - マーチン
Martin - マーチン
It's currently raining and stuff.
Looking for a new job.
Nothing much else.
 
M.A.R.
M.A.R.
Oh, not much turmoil
Well, I'm still enjoying my peak. It's all been a peak after the transplant.
 
Martin - マーチン
Martin - マーチン
That's good. Enjoying is something I also do like to enjoy.
 
M.A.R.
M.A.R.
2:51 PM
Meta.enjoy
 
Martin - マーチン
Martin - マーチン
that's where you are now?
 
M.A.R.
M.A.R.
Well, now I'm home, but that's where I study
Solid. For our standards, I guess, but still.
 
Martin - マーチン
Martin - マーチン
As long as you can learn...
 
M.A.R.
M.A.R.
3:11 PM
@Martin-マーチン I'm fairly convinced the outside world can impede learning, but it can't help it.
It's something you gotta do for yourself.
 
Martin - マーチン
Martin - マーチン
Oh well, the outside world can be tricky. But so can the inside world. And not only with learning you have to convince yourself to do it. Usually though, learning is a more fun activity...
Well, I've got to go now. I still have to do some things... I'm sure I'll see you next time around...
 
M.A.R.
M.A.R.
@Martin-マーチン Now you're doing that hybridization talk again
@Martin-マーチン Auf Wiedersehen
 
Jan
Jan
3:35 PM
Lab clean. I’m done.
 
M.A.R.
M.A.R.
@Jan Pd cats licking their paws
 
1,3-feeds
1,3-feeds
0
Q: Why is there no "reduced adds" privilege at 200 reputation on this site?

jknappenBy accident I found out that on this site the privilge reduced adds at 200 reputation does not exist according to the help page. Is there a reason for this?

discussion bug reputation
 
Jan
Jan
@M.A.R. I will shoo them with deuterium oxy-germanium!
 
M.A.R.
M.A.R.
@Jan Heh, part of the neighborhood has stray-ish but pretty tame dogs and cats. It's fun when you suddenly see a kitty run so silently and fast in front of you and turn around and see it pissed off a dog
The dogs always bow and go away when they see a hoomin
 
Jan
Jan
3:52 PM
@M.A.R. How kind of them.
Hello Looong o/
(I keep forgetting where / is on this keyboard D=)
 
Loong
Loong
@Jan Hello!
 
Jan
Jan
@Loong Everything fine your end?
 
Loong
Loong
As usual, I cannot complain enough. ;-)
 
Jan
Jan
Oh good, a true German :-)
 
Loong
Loong
hehe
 
Jan
Jan
4:01 PM
If you were confused about a random follower on Twitter recently: that was me.
 
Loong
Loong
I only use Twitter to look at the shit that is posted by SE employees.
 
Jan
Jan
:D
I do say, I kept a little more up to date thanks to your retweets.
 

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