The Periodic Table

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orthocresol

01:09

Petition to rename Lonely Planet to Loong Planet? :)

Loong

No, in contrast to the authors of Lonely Planet, I really went to the places I talk about.

Ramanujan

A: Do all gases occupy same volume at equal temperature and pressure conditions?

IUPAC has changed the definition of STP from [273 K, 1 atm (101.3 kPa)] to [273 K, 1 bar (100.0 kPa)]. Hence their molar volume at STP has changed from 22.4 L/mol to 22.7 L/mol.

There is nothing change given in wikipedia

Loong

@Ramanujan hm?

Ramanujan

Ideal gas

An ideal gas is a theoretical gas composed of many randomly moving point particles whose only interaction is perfectly elastic collision. The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics. One mole of an ideal gas has a volume of 22.4 litres at STP as defined by IUPAC. At normal conditions such as standard temperature and pressure, most real gases behave qualitatively like an ideal gas. Many gases such as nitrogen, oxygen, hydrogen, noble gases, and some heavier gases like carbon dioxide can...

22.4 litres at STP as defined by IUPAC ^

Loong

That was changed in 1982.

goldbook.iupac.org/S05921.html

At the new standard pressure, the molar volume is actually 22.710947 l/mol.

physics.nist.gov/cgi-bin/cuu/Value?mvol

Ramanujan

01:24

Why change?

(because temperature of earth is increasing :P ?)

Loong

Fortunately, the charging one has been solved now that we've all standardized on mini-USB. Or is it micro-USB? Shit.

Ramanujan

@Loong so wikipedia is not up to date?

Loong

Actually, the reason was that the old "standard atmosphere" of 1 atm = 1013.25 mbar didn't go so well with the SI units. Therefore, they decided to change it to a round value of 1 bar = 100000 Pa.

@Ramanujan yes, if they still use the old value.

However, also many textbooks still use the old value.

That's why we still get many homework questions based on the old value.

Ramanujan

OK,bye

2 hours later…

paracresol

03:49

Q: Can drinking a lot of water be fatal?

I vaguely recall hearing that drinking too much water can, over time, prove fatal to the human body. Nothing special about the water; not distilled or de-ionized or anything... just plain ol' water. Now the reason that accompanied this "fact", was that drinking too much water serves to dilute, ...

Put on hold?

Sighs

@Mart Can't you use your Mod powers to open it? The reason it was closed under (personal medical questions) has nothing to do with what's addressed in the question ._.

2 hours later…

Martin - マーチン

05:28

@paracresol Yes, I could overrule the verdict of the community, but I won't. I try not to interfere with such decisions except for the very obvious ones. Since you have already voted to reopen, give it some time, maybe it will get there. Alternatively, open a meta discussion about it.

Joe Stavitsky

05:48

img.ctrlv.in/img/17/02/07/58995c331aa6a.png - answer is 28 torr/m, right?

3 hours later…

DHMO

09:07

in the hydration of ethene, why is H3PO4 used instead of H2SO4?

3 hours later…

M.A.R.

11:53

@DHMO Hmm? IIRC we can use H2SO4 as well.

paracresol

12:19

@Martin-マーチン Ah, fine... I'll wait. @geta o/

M.A.R.

@paracresol I reopened, but you do realize the main reason people had to close it, right?

paracresol

By the way, @Mart, @geta, @ortho... you guys know any site that deals with (a simplified version of) Heisenberg's Theory of Ferromagnetism?

@M.A.R. ...because I get too many HNQs? ;D

...and thanks for the reopen vote, by the way.

M.A.R.

@paracresol It's not terribly amusing to tell yourself ''now look at this guy, he doesn't even want to know the answer. He's just hunting for rep and HNQ''

You're destroying your image in the userbase's mind.

At least the ones that care.

paracresol

^ Bu...but... I do have the answer ._.

Besides, as for my top three questions, I really did want a good answer to those ^_^

paracresol

12:36

Q: How different colors are formed on candle flame?

When a candle is lit;blue,orange,yellow colors of flame are seen.Is this happen due to the presence of variation of oxygen availability.What is the reason for this?

everyday-chemistry

^ Sighs

DHMO

@M.A.R. what are the conditions then?

M.A.R.

13:04

@DHMO chemguide.co.uk/organicprops/alkenes/h2so4.html

DHMO

thanks

1 hour later…

Ramanujan

14:05

qph.ec.quoracdn.net/…

paracresol

..............

Ramanujan

I was searching for how to make chemistry interesting and I found this^

paracresol

@M.A.R. Now that I think about it...does this mean you're one of those that care? ;D

DHMO

@Jan Kann ich dir eine Frage stellen?

Q: E2 step in dehydration of primary alcohol using concentrated sulfuric acid

The familiar two-step $\mathrm{E2}$ mechanism of the dehydration reaction of ethanol using concentrated sulfuric acid is given below (forgive me for not using diagrams): $\ce{H-CH2-CH2-OH + H2SO4 -> H-CH2-CH2-OH2+ + HSO4-}$ $\ce{HSO4- + H-CH2-CH2-OH2+ -> H2SO4 + CH2=CH2 + OH2}$ I have certain...

organic-chemistry reaction-mechanism

viewed 25 times only...

DHMO

14:31

wtf is this reaction

Jan

@DHMO Sure, but if you want to ask in German do it in the g block so that @M.A.R. won’t get upset ;)

DHMO

@Jan the g block has not seen any light for 5 days

so the question is linked

Jan

@DHMO Take it out of the dark ages and into the light!

DHMO

and @M.A.R. soll Deutsch lernen

1 hour later…

DHMO

15:48

@paracresol hi

paracresol

@Jan Ich glaube, ich habe ihn schon aufgeregt :D

Nov 12 '16 at 12:35, by M.A.R.

Tries to change @Aaron to English mode, fails, restarts @Aaron

@DHMO o/

DHMO

@paracresol look at the above reaction

paracresol

@DHMO Where the heck did you get that?

DHMO

@paracresol searching online

paracresol

Shrugs

DHMO

15:52

when i look at the mechanism

i was like "wtf?"

paracresol

^ I saw that :3

1 hour ago, by DHMO

wtf is this reaction

DHMO

that's certainly a whole new branch of mechanism

after free-radical mechanism and ion mechanism

Ramanujan

Helium should be considered as s-block element?

Because it has last electron in s-orbial?

DHMO

16:09

isn't it considered as s-block element?

Ramanujan

Yes,I think it should be

DSVA

16:28

yay my boss told me I get a new PC so I don't have to work on that Core2 any more and that they found a great machine for me...

an 8 year old dual opteron quadcore which sounds like a fighter jet...-.-

Bounty Hunter

17:27

Q: Difference between Coupled Cluster and Full CI

I'm looking at some high precision quantum chemistry methods like Coupled Cluster (CC) and FULL CI (FCI). It seems both CC and FCI start from Hartree-Fock and then excite the electron to higher states. If I understand correctly, CC uses an exponential operator to raise the states of the electro...

quantum-chemistry computational-chemistry electronic-configuration

Q: What happens chemically to 5'-radiolabeled aqueous thyroxine (thyroid prohormone) when its I-131 undergoes beta+gamma decay?

Related to this question about $\ce{^{14}C}$ beta decay in $\ce{CO2}$, what happens when the $\ce{^{131}I}$ in radiolabeled thyroxine (thyroid prohormone, or "T$_4$") undergoes beta-plus-gamma decay to form $\ce{^{131}Xe}$? In order to narrow the scope of the question to something tractable, ass...

organic-chemistry reaction halides radioactivity noble-gases

orthocresol

17:50

Chemistry depends on various factors dude. There can be many ways to explain a fact. I just thought a possible explanation. If you have another you are free to propose it — Palash gupta 4 mins ago

Ok.

M.A.R.

18:04

@orthocresol Pfft, dude, do you even chemistry

@paracresol Up to you to interpret

@DHMO If this is some kinda swear, CURSE YOU BACK

If it's not swearing, CURSE YOU BACK ANYWAY

orthocresol

18:38

Okay mate... Your answer? — Palash gupta 44 mins ago

Well, I did what I could for that question. :)

M.A.R.

I believe that was his answer. Mate. — M.A.R. 10 secs ago

Anyone else reading that in a Jack Sparrow tone?

It's not productive for pirates to meddle with chemistry.

Or Orthy Jones.

2 hours later…

M.A.R.

20:27

stackoverflow.blog/2017/02/What-Programming-Languages-Weekends/…

Nice, Haskell

1 hour later…

Loong

21:52

@M.A.R. and why is that babble featured on all sites again?

Jan

22:13

-22

Q: We're Implementing an "announcement" Tag for Direct Communication From the Team

Following up on this answer that I wrote to a question wondering if the policy on political discussions had changed (and several other places), I indicated that setting 'announcement-y' type stuff apart from features, bugs and discussions was something we could do to lessen the dissonance folks f...

discussion moderator-tags

@Jan Just posting this to point out its score xD

Loong

needs more downvotes

Mithoron

Loong

And they really don't need another stupid "announcement" tag. As you can see on our front page, they can just "feature" any useless crap, and there is nothing we can do against that.

Jan

22:41

@Mart or @anybody else who’s in Japan and/or might have a better idea of where to search … I heard that apparantly Nakamura’s group in Kyoto had a Postdoc position to fill but it’s been frigging impossible to find a corresponding notice anywhere. Any hints on where I should have looked?

Jan

22:57

@Jan @M.A.R. You have the privilege. Could you post the current vote count breakdown of that post? =)

DHMO

23:20

@M.A.R. revenge is not the jedi way

Bounty Hunter

23:36

Q: Obtaining activity coefficients of conjugate acids of some common carboxylic acid molecules

Recently, I have been wondering about justifying the notion on how some common acids (e.g. carboxylic acids) are themselves weaker bases than water to the point that we don't usually consider them to act as base. To begin, we use the formula for $\mathrm{p}K_\mathrm{b}$ and consider for example a...