The Periodic Table

user2236

03:01

World's most prestigious maths medal is stolen minutes after professor wins it

Abcd

03:48

,,, or .

Please fix it.

paracetamol

05:08

1

Q: Is there a compound that contains water as a subcomponent?

Can you name a molecule that contains water chemically bonded to another molecule/element?

water

paracetamol

07:11

Fallout 76 Country Roads Cover (Original Trailer Soundtrack)

►

@hBy2Py ^

:D

Waves happily at @M.A.R

M.A.R. ಠ_ಠ

hai

paracetamol

o/

Abcd

08:15

Can someone please tell me why the top amide bond is not considered an amide bond?

paracetamol

08:46

@Abcd You mean "not considered a peptide bond"? ;-)

Unfortunately for whoever told you that, it certainly is a peptide bond :D

^ From Voet (4e), page 70

Abcd

09:54

@paracetamol No, you can;t be sure still because the example you have given me validates this statement that is written in my notebook:

@paracetamol In the example you have given me the alpha carbon is attached to N.

But this confuses me furtherr^^^ . Even here the alpha carbon is not attached to Nitrogen but still it is called peptide bond.

paracetamol

12:29

@Abcd ._.

Look, when two alpha amino acids condense, you're obviously going to have the amino group attached to an alpha carbon ._.

@Abcd What do you mean by "here the alpha carbon is not attached to Nitrogen"?

It's very clearly an alpha carbon (or am I looking at the wrong thing?) ;-)

Also, that little note you have is only taking about alpha amino acids (there are beta amino acids too, and they form beta peptide bonds)

@Abc It would help if you could frame that as a question on the main site O:)

@Mart Guess I made Wikipe-tan mad ._.

Abcd

13:03

@paracetamol we only have alpha amino acids in our syllabus

@paracetamol They will downvote it on main site that's why I am not asking

Or they will just demand the "sourcee$^\infty$" from me which i dont have.

hBy2Py

@Abcd @para This sounds like a case of conflicting conventions.

Abcd

@hBy2Py how?

hBy2Py

It's been a long time since I took biochem, but from what I recall, I was taught then that a peptide bond is an amide bond that's in the configuration used biochemically to construct proteins.

@Abcd So, the upper bond here is an amide bond, but it is not a peptide bond because, basically, the 'backbone' doesn't go N-C-C-N-C-C

I would actually argue that the lower bond also is not a peptide bond, because there's no intervening carbon between the N of the amide bond and the terminal carboxyl.

But, if a different author/scientist wanted to just declare all amide bonds as also being peptide bonds, then both of those bonds would be peptide bonds.

Abcd

@hBy2Py But what's the official recognition of peptide bonds?

hBy2Py

Is there one?

Ah, Gold Book.

goldbook.iupac.org/html/P/P04479.html

"Amides derived from two or more amino carboxylic acid molecules (the same or different) by formation of a covalent bond from the carbonyl carbon of one to the nitrogen atom of another with formal loss of water."

"The term is usually applied to structures formed from α-amino acids, but it includes those derived from any amino carboxylic acid."

Sounds like the actual definition is quite general. Huh.

But yeah, it's that "usually applied to structures formed from alpha-amino acids" part that throws things.

I suspect some people strongly prefer to confine the definition to bonds between alpha-amino acids only.

And, when it comes to homework/exam marks, you're stuck with the preference of the person making the key.

Give the grader the answer they want, but don't feel obliged to agree with them.

Abcd

13:34

@hBy2Py So according to this top one is not a peptide bond?

hBy2Py

According to this, I would say it is a peptide bond, per the most expansive sense of the Gold Book definition.

The left-hand portion of the molecule could be broken down into an amino carboxylic acid

If you hydrolyze the lower amide bond, you end up with a carboxyl there

Which, actually, isn't even relevant, now that I think about it

If you hydrolyze the upper amide bond, you obtain two pieces. Each piece has both >0 amine groups, and >0 carboxylic acid groups on it.

Therefore, both pieces are "amino carboxylic acid molecules", which means they fit the Gold Book definition of the required precursors to make a peptide bond, by condensation reaction.

paracetamol

13:51

Waves frantically at @hBy2Py

hBy2Py

@paracetamol Yeeeeeesss?

:-)

paracetamol

Nothing, just my way of saying "hi" X3

Reading what you wrote

@hBy2Py Not sure I quite understood that logic :3

hBy2Py

@paracetamol I changed my mind halfway through

Once I found the Gold Book page

paracetamol

Woot! \o/

Pssst ~~@hBy2Py~~ Brian, any Biochem books you can recommend? O:)

I've already managed to get my hands on Voet, Lehninger and Lippincott recently...

Also, I guess you don't listen to hard bass (<--- Russian Music Genre) ;-P

Soviet Army dancing to Hard Bass

►

hBy2Py

@paracetamol Huh, not familiar with it.

paracetamol

14:00

Not surprised XD

hBy2Py

@paracetamol None recent. I haven't actively studied it in 15 years. All my textbooks are woefully out of date.

paracetamol

I've only been recently acquainted with it myself O:)

@hBy2Py I see! Thanks anyway! :-)

Also Sprach Zarathustra, Op. 30 - Strauss

►

^ You'll only begin to hear something (clearly) from 0:17 onwards

hBy2Py

Huh - which Strauss is that? Richard?

Ah, yep. Dunno if I know that one.

paracetamol

@hBy2Py Yep :D

hBy2Py

OH.

Hahahaha, nice -- I had no idea that theme wasn't composed specifically for 2001SO

paracetamol

14:10

95

A: Why doesn't water burn?

This is the reaction that occurs when hydrogen combusts: $$ \ce{2H2 + O2 -> 2H2O} $$ Similarly, this is the combustion reaction for methane, a representative fuel: $$ \ce{CH4 + 2O2 -> CO2 + 2H2O} $$ Water is a product in both of these reactions. Thus, water represents something that has alrea...

^ You've been 5 votes away from the Great answer badge for over a year now...how can you live with yourself? XD

If it were me, I'd go nuts X3

@hBy2Py Also, I haven't watched the movie, but I'm aware that this piece was popularized by it O:)

hBy2Py

@paracetamol Haven't watched it either, but yeah -- major popularization.

paracetamol

> I had a chem prof tell me of a coworker he once had who failed to wash up prior to using the restroom after having been working with HF. Skin grafts where you don't want them. A lesson in hand washing after lab work. A very unpleasant lesson..

Your tweets are very entertaining ;-P

hBy2Py

Someone has found my Twitter. :-)

paracetamol

Looks around innocently

I don't use Twitter though (but I might reconsider now :3)

> Human Brian is still evolving- Scientist

Pfffft

hBy2Py

I couldn't not comment on that one.

@paracetamol What, I'm supposed to hassle friends into signing up for SE so they can upvote me to the badge? :-P

Martin - マーチン

14:21

@hBy2Py thin ice

paracetamol

@hBy2Py Erm...if you want? O:)

Thumps @Mart heartily on the back

hBy2Py

@Martin-マーチン EXACTLY. I don't want to be like @M.A.R., constantly half a step away from a decade-long ban.

paracetamol

M.A.R doesn't strike me as someone who'd end up with a decade-long ban :P

Martin - マーチン

well... i guess you'll get there eventually

paracetamol

Or is there something I don't know about he who calls himself "M.A.R"?! :O

hBy2Py

14:24

I'm a lot more excited about having finally gotten my first tag badge, a little ways back.

Martin - マーチン

your first... was it OC?

hBy2Py

Uhm... PC, IIRC.

Yep.

I'm actually surprised I have as many answers in OC as I do. I don't really know that much about it.

Martin - マーチン

Haha... I got that tag in silver... because computational stuff also tends to go towards organic chemistry

yet i am struggling to get the silver tag there -.-

hBy2Py

It's weird and often annoying how votes do and don't get cast on stuff.

And how effort expended at answer composition often seems to inversely correlate with upvotes gained.

Martin - マーチン

true, the simplified trend: easy to understand = many votes

orbital expansion is still a vote magnet even though most people here know it is utter garbage

Gaurang Tandon

14:36

@Martin-マーチン (sorry for the interruption) how are you finding that userscript (keyboard shortcuts)? Do you have any suggestions for improvement?

hBy2Py

@Martin-マーチン But, of course, you look askance at my charge-shift bonding take on hypercoordination. ;-)

Martin - マーチン

nah don't be sorry...

I havn't had much time to spend on chem.se and also didn't use it much therefore

Gaurang Tandon

alright

Martin - マーチン

@GaurangTandon I'd like to have something like a popup, which shows the currently bound hotkeys... possible?

Gaurang Tandon

@Martin-マーチン cool, that is doable

Martin - マーチン

14:39

if you say yes, i'll file an issue...

Gaurang Tandon

Sure file an issue

Martin - マーチン

:D Man i've gotten to love github

Gaurang Tandon

...because it's very easy to give and receive feedback? :)

Martin - マーチン

not only... it's like a notebook, too

Gaurang Tandon

Hmm

Martin - マーチン

14:41

but yeah interaction is very easy

Gaurang Tandon

A notebook that keeps track of everything you ever "committed" to it

hBy2Py

<nod>, it's really easy to keep track of TODO there

Gaurang Tandon

;)

<nod>

Waves at noddy @hBy2Py

Make way for noddy

hBy2Py

When I was first getting into Python ~4yrs ago, I was mainly using code-comment #TODOs. Pretty quickly just started shunting everything into GH.

Martin - マーチン

i'll file issues for my own projects, when i notice something immediately, and before i extend functionality, I'll check whether i can implement it

Gaurang Tandon

14:43

(just googled that "noddy" has more meanings than the animated character... :/)

Martin - マーチン

@hBy2Py i don't like charge-shift... I don't find the theory behind it very compelling

Gaurang Tandon

@Martin-マーチン i do pretty much the same

hBy2Py

@GaurangTandon Never even heard the term, or character, before.

Gaurang Tandon

@hBy2Py the animated character was very popular in my region when I was very young (10 yrs ago)

Martin - マーチン

@GaurangTandon mind blown

hBy2Py

14:45

@Martin-マーチン The density/localization dynamics seem pretty clear to me, whatever the best mechanism for explaining it might be.

Gaurang Tandon

@Martin-マーチン gathers Martin's blown mind, assembles it, and uses it for self ;)

Martin - マーチン

I dislike the idea of classifying a covalent bond as having to have two electrons, that is so contrary to everything I know

Gaurang Tandon

@hBy2Py those are the hardest to keep track of, but i'll admit they are useful for simpler issues (minor method refactor, etc.)

hBy2Py

@GaurangTandon Apparently PyCharm has really good #TODO-related features now.

But lately I've done most of my dev in ~plain text editors, so I don't have anything that collects them all in one place.

@Martin-マーチン I might have leaned on that point harder than I should have...

Because in, e.g., methane, the localization basins for the C-H bonds don't all have exactly 2e- of integrated density in them.

Gaurang Tandon

@hBy2Py really? I can't withstand plain text editors ever since I started using VS code and VS community

hBy2Py

14:54

@GaurangTandon I haven't tried VS Code yet, but I might give it a shot before long. Have heard lots of good things about it.

Gaurang Tandon

@hBy2Py it has automated git integration, the feature i missed the most in any plain text editor

Martin - マーチン

VI!!!!!!! VI!!!!!111!!!

Gaurang Tandon

@Martin-マーチン though i mostly use vim, because I can't figure out how to exit it <jk>

hBy2Py

@GaurangTandon I much prefer to manage my own git, at the shell.

Gaurang Tandon

@hBy2Py hmm...you can continue to do that, but vs code makes committing code updates easier

Martin - マーチン

14:58

2705

Q: How to exit the Vim editor?

I'm stuck and cannot escape. It says: "type :quit<Enter> to quit VIM" But when I type that it simply appears in the object body.

vim vi

hBy2Py

@GaurangTandon Lol, how?

Martin - マーチン

sometimes i don't like SOX

hBy2Py

   git commit -a
   [edit msg]
   git push

Gaurang Tandon

@hBy2Py code.visualstudio.com/docs/editor/versioncontrol

...because you don't need to type new commands in a separate shell, and you can view commit diff before pushing... All in a GUI too

hBy2Py

I guess if it has a clean interface to the interactive git add functionality, that would be handy

(where you can indicate line-by-line what you want committed)

Martin - マーチン

15:00

commitstrip.com/en/2017/05/29/trapped

Gaurang Tandon

@Martin-マーチン thanks, i found salvation

Martin - マーチン

Avnish Kabaj

I downloaded vim once

Wasn't able to figure out how to use it

Gaurang Tandon

@Martin-マーチン a classic

Avnish Kabaj

Stuck with sublime text

Martin - マーチン

15:01

@GaurangTandon GUI... and I'm out O.o

Gaurang Tandon

What do you write on sublime?

Avnish Kabaj

C++ back in 8th grade

C also

A bit of python

Gaurang Tandon

@Martin-マーチン ehh :/ GUI in the sense that you don't need to type text commands in a separate shell

Avnish Kabaj

I used cs50

Gaurang Tandon

you can use the notepad++ free text editor for c++

Martin - マーチン

15:03

@GaurangTandon if it doesn't run in a command line window, it's too slow for me

@GaurangTandon that's my goto on windows

Gaurang Tandon

@Martin-マーチン i'll encourage you to try the git integration first...I hope you'll find it fast enough

Martin - マーチン

the problem is the graphical part... anything that is producing more than just text in a terminal is too slow

i'm not writing code on a local machine

Gaurang Tandon

The GUI shows more information too...

paracetamol

@hBy2Py Penguins, eh? 8D

Waves at everyone in chat

hBy2Py

@paracetamol Yeessssss, penguins indeed. What else!?

paracetamol

15:10

D...d...dark chocolate? O:)

Martin - マーチン

@GaurangTandon I get that, but i'm no coder... I write a bit of bash and that's it, I don't need the fancy

it's like i like writing my latex... pure and simple in the vim :D

hBy2Py

@Martin-マーチン <nod>, I don't even use addins &c. with vim. ~Plain vanilla.

Gaurang Tandon

@Martin-マーチン alright then :P

paracetamol

...and moths ._.

Avnish Kabaj

@GaurangTandon if I get cs in a decent college I'll use that

Martin - マーチン

15:13

I have tried editors before, they confused me with their automation, I need highlighting of code, and vim does that quite well

@AvnishKabaj counterstrike? ;)

Gaurang Tandon

@Martin-マーチン how does the syntax highlighting in vim differ from that in other IDEs?

Martin - マーチン

don't know

i mean stuff that they insert automatically, like when you type \begin{sth} it automatically ends it...

paracetamol

@Martin-マーチン You play Counterstrike? :D

Gaurang Tandon

@AvnishKabaj you don't need to get cs in a decent college to do that. As long as cs is your interest, you can do it in any dept of any college

@Martin-マーチン i didn't knew you knew that!

Martin - マーチン

or you type frac and then there are {}{} and you jump around with the cursor...

hBy2Py

15:17

@GaurangTandon I played waaaay too much CS in college

Martin - マーチン

counterstrike was a thing when i was young

hBy2Py

And got waaaaay too angry about it....

Martin - マーチン

i might still have the cd somewhere...

Gaurang Tandon

Hmm i dont know about latex completion in other editors, it might be there, or might not

hBy2Py

I got rid of mine - it's all on Steam now.

paracetamol

15:19

@Martin-マーチン Don't worry, you're still young (enough) ;-)

Gaurang Tandon

@hBy2Py hehe, it's very popular in every college

paracetamol

@hBy2Py :O

@hBy Ever played Fallout? :D

hBy2Py

@paracetamol Nah, after my time. I haven't played videogames with any regularity for over 10yrs now.

paracetamol

Shudder

hBy2Py

I did play some Descent a couple years ago, after I discovered that somebody went back and re-implemented it with modern video rendering.

paracetamol

15:21

Never heard of it, sorry XD

Martin - マーチン

actually my computer never was fast enough to play it properly

paracetamol

@Mart I hear you :'(

hBy2Py

dxx-rebirth.com

Martin - マーチン

at work we played openarena.ws/smfnews.php

okay it's beer o'clock... see y'all soon

Gaurang Tandon

@Martin-マーチン you guys play at work o.O

hBy2Py

15:23

Later, @Mart

Hehe, I played Halo with a couple of guys on and off for a while during grad school

Gaurang Tandon

@hBy2Py Yay, I did too, but single player

hBy2Py

I played the single-player campaign, too.

The save structure was good for me -- I have a tendency to cautiously over-save in FPSes

Gaurang Tandon

I've heard the multiplayer version is more fun though...

:D

paracetamol

See ya @Mart! o/

@hBy2Py Tried anything from the ARMA series? :D

hBy2Py

No, never heard of it, I'm afraid.

paracetamol

15:27

Military/Warfare sim ^

Hmm, played any GTA?

hBy2Py

Some GTA2 (top-down run/drive), a bit of one of the newer FPS-style ones.

paracetamol

I see :3

Scratches head trying to come up with some good titles

1

Q: Is there a compound that contains water as a subcomponent?

Is there a molecule that contains water chemically bonded to another molecule/element? Could someone provide an example or two?

inorganic-chemistry water

Oh phooey, it got closed :(

hBy2Py

One I sort of wish I'd still been playing actively for was Bioshock

That looked really sweet

paracetamol

Never heard of it until now XD

hBy2Py

Doom 3 was the most intense FPS experience I've ever had, though.

They did a hella good job with it

paracetamol

15:31

^ Ah, I've heard of that one!

Phew

Japanese for Slav チーキ・ブリーキ・イブダムケ！

►

Boris plays Doom (2?) every now and then ^

hBy2Py

And then there's the whole slew of old games I've played

Commander Keen, Doom, Gunship, Kings Quest

paracetamol

@hBy2Py Yeah, judging by the emphasis on "old", I'd imagine most of those were from before I even existed X3

hBy2Py

And some really obscure ones... Fire King

@paracetamol Most likely. :-)

Oh: "GERROFFF MY LAWN YOU WHIPPERSNAPPER"

Obligatory

paracetamol

^^ Sounds familiar :3

Wait, that from a movie?

Monster House (film)

Monster House is a 2006 American 3D computer-animated family horror comedy film directed by Gil Kenan, produced by ImageMovers and Amblin Entertainment, and distributed by Columbia Pictures about a neighborhood terrorized by a demonic house. The film stars Mitchel Musso, Sam Lerner, and Spencer Locke. The characters are animated primarily utilizing performance capture. Monster House received generally positive reviews from critics and grossed over $140 million worldwide. == Plot == The parents of twelve-year-old DJ Walters leave town for the weekend, leaving him in the care of his babysitter, Zee...

Could've sworn that's a line from there ^ X3

Oh yeah, I should've mentioned the last video I posted contains some cussing and...erm... something else, hence NSFW ._.

hBy2Py

15:49

@paracetamol Oh, probably... but more than anything it's a general Americanism for crotchety old men yelling at kids.

paracetamol

^ That too O:)

Interesting going-ons in Ohio I see ;-) rt.com/usa/434916-judge-ducttape-prisoner-williams

hBy2Py

@paracetamol Doesn't matter what you have to say. If the judge tells you to stop talking, you stop. Talking.

paracetamol

Yes sir! :O

^ Made me crack smile O:)

Ah well, I'm off then! See ya @hBy2Py! o/

hBy2Py

@paracetamol Have a good one!

paracetamol

Scoots

Loong

17:08

> I'm not worried about getting an IUPAC name exactly right, becuase nobody actually does that.

Hm

4

Martin - マーチン

Wow, I'm amazed I didn't find that wiki article previously! However that seems to be a salt of this particular molecule, not the thing itself. — iammax 1 min ago

hBy2Py

@Loong That nomenclature gold tag badge? Totally illusory.

Loong

@Martin-マーチン Well, if he would have tried some IUPAC name, he would have found the Wikipedia article.

Martin - マーチン

We need a I-am-too-dumb-to-use-google close reason

Loong

but, but, but, the new CoC ;-)

Martin - マーチン

17:14

@Loong hmmm i googled bis pyridine iodine and found it

also... if your not into text, you can draw it at chemspider

hBy2Py

Fifth Google result under "pyridine iodine" is an article on ResearchGate (from 1971!) about the very thing.

Martin - マーチン

and then there is the issue of trying to benchmark something of off it

@hBy2Py hmmm that depends on your usage of google

it's not for me

hBy2Py

Ah, results personalization differences, maybe?

Interesting.

M.A.R. ಠ_ಠ

@hBy2Py UR FACE IS HALF A STEP AWAY FROM A BAN

Martin - マーチン

it sometimes gives preferences to stuff you click more often...

M.A.R. ಠ_ಠ

17:18

Why would anyone want to ban such a cool guy as I?

@Martin-マーチン somealwaystimes

@hBy2Py I will need you to Google stuff for me in the future

Brings up a question.

Loong

off topic; migrated to google.stackexchange.com

M.A.R. ಠ_ಠ

Is it fair to call out noobs that haven't researched their question if they only got porno results searching for "nucleophilic attack"?

hBy2Py

@M.A.R.ಠ_ಠ This whole scenario suffers from an array of verification difficulties.

Martin - マーチン

Couldn't find google.stackexchange.com
The Q&A site google.stackexchange.com doesn't seem to exist…yet.

You can vote for it to be created through our democratic, community-driven process at area51.stackexchange.com, or see a complete directory of all our Q&A sites at stackexchange.com.

M.A.R. ಠ_ಠ

@user2236 HARHARHARHARHAR

Martin - マーチン

17:25

yet

M.A.R. ಠ_ಠ

Oh poor guy looks like Hugo Weaving

@Martin-マーチン Go suggest it, it'd be fun

Loong

democratic? community-driven?

really?

Martin - マーチン

more than in other places

M.A.R. ಠ_ಠ

Yeah these censorshiupz modaratorz

Loong

@Martin-マーチン true

Voting in Switzerland

Voting in Switzerland (called votation) is the process by which Swiss citizens make decisions about governance and elect officials. The polling stations are opened on Saturdays and Sunday mornings but most people vote by post in advance. At noon on Sunday (Abstimmungssonntag in German), voting ends and the results are usually known during the afternoon. Switzerland's voting system is unique among modern democratic nations in that Switzerland practices direct democracy in parallel with representative democracy, which is why the Swiss system is known as a semi-direct democracy. Direct democracy allows...

M.A.R. ಠ_ಠ

17:29

Abstimmungssonntag

Holy sh!t

How do you even pronounce double s and double n one vowel apart?

Avnish Kabaj

@Martin-マーチン how did you know

O.o

@GaurangTandon ¯\_(ツ)_/¯

M.A.R. ಠ_ಠ

@AvnishKabaj They have COD colleges here

Pfft

Avnish Kabaj

@M.A.R.ಠ_ಠ I thought 10 year olds played cod

M.A.R. ಠ_ಠ

10-year-olds go to college here

0

Q: Why doesn't Carbon Monoxide has a dative bond in Lewis Dot structure

When drawing Lewis Dot Structure for Carbon Monoxide $\ce{CO}$ , what would be its correct structure? In my textbook the structure of $\ce{CO}$ is given as $$ \ce{{:}C\bond{#}O{:}} $$ [where the colons represent lone pair] Here is the structure Which I think is right: I am not convinced w...

bond covalent-compounds lewis-structure

How on Earth do you answer something like that?

I mean, the title's grammar is all wrong

Martin - マーチン

17:57

OP uses overwrite power for the dark side... chemistry.stackexchange.com/review/suggested-edits/85191

Loong

There is a special hell for that.

Martin - マーチン

it has a tiny bucket with supercritical water in it; there they bathe

21 q in the CVQ O.ô

M.A.R. ಠ_ಠ

@Martin-マーチン That's what happens when I stop reviewing CV

It just got too hard to decide, and I usually don't

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