The Periodic Table

Jan

00:02

0

When a solid piece of Mg is attached to a solid piece of Cu and is placed into HCl(aq), why does it appear that the Cu slowly starts to bubble?

See the tags :D :D :D

skullpetrol

00:14

!!beer

Chemobot

skullpetrol

:D

Chemobot

Jan

!!tea

skullpetrol

00:33

Did you accept your job offer @Jan?

Jan

Thing is we have to apply for funding. But I would if I already could ;)

skullpetrol

I see :-)

Ramanujan

01:05

Hello

Wdoctor123

Guys how would you go about converting 2bromopropanoic acid to ethanol?

Jan

Selling the acid and buying the ethanol is probably the most cost-efficient solution (even if this comment sounds trolly).

Hi @Ramanujan o/ and @Wdoctor123 o/

My first (chemical) ideas circle around generating pyruvate (turn Br into OH, then oxidise) and decarboxylating that; if need be using pyruvate decarboxylase. Then that can be reduced to ethanol.

Wdoctor123

I just want to know the process :)

so turn 2 bromopropanoic acid to 2 hydroxy propanoic acid using naoh

any ideas? :P

wait can I use the soda lime to decarboxylate to propanbromide?

Ramanujan

Hydrochloric acid is kept in plastic or glass bottles, why?

orthocresol

@Jan May I suggest, an esterification with $\ce{EtOH, H+}$ to form ethyl 2-bromopropanoate, followed by a hydrolysis and isolation of the ethanol product?

Wdoctor123

01:20

@orthocresol what would be the actual steps?

Jan

@orthocresol No, that is basically the selling and rebuying method ;p

@Ramanujan Whatever you have available, it doesn’t matter.

orthocresol

B-b-but it's a chemical reaction...

Jan

But none of the reactant’s carbon molecules make it to the final product …

Ramanujan

@Jan,why?!?!?

Loong

@orthocresol Is that a chemistry version of the barometer question? ;-)

orthocresol

01:23

@Loong Yeah, pretty much :D

Jan

@Loong What’s the barometer question?

@Ramanujan Well, you obviously don’t want to keep it in your bare hands, so you need a bottle …

Loong

Barometer question

The barometer question is an example of an incorrectly designed examination question demonstrating functional fixedness that causes a moral dilemma for the examiner. In its classic form, popularized by American test designer professor Alexander Calandra (1911–2006), the question asked the student to "show how it is possible to determine the height of a tall building with the aid of a barometer." The examiner was confident that there was one, and only one, correct answer, which is through calculating the difference in pressure at the top and bottom of the building. Contrary to the examiner's...

Wdoctor123

chemguide.co.uk/organicprops/acids/decarbox.html

wait so you can use the soda lime to get rid of cooh

Ramanujan

@Jan, that's not the scientific reason..

Wdoctor123

so ch3chbrcooh + NaOh -> Ch3ch2br

ch3ch2br + naoh (heat and boil under reflux) -> ch3ch2oh

done

I think

Is this ok? or

is it wrong?

@Ramanujan because hcl doesn't react with plastic or glass

some plastics*

Jan

01:30

@Wdoctor123 That would work, yes.

Wdoctor123

yay

Loong

@Ramanujan HCl doesnt react with glass or plastic; but if you want ultrapure hydrochloric acid, you should use plastic.

Wdoctor123

why plastic for ultra pure?

surely if you want the ultra pure you just make it on the spot?

Matix

0

Q: Can someone tell me how to solve this problem on enthalpy?

When 14.9 g of solid KCl is dissolved in large excess of water , the amount of heat liberated is 3.72 kJ. How do we calculate the heat of solution of KCl? You don't need to solve the entire sum just tell me what am I supposed to do with the mass?Will the reaction be KCl + H2O=K+ + Cl- ?

thermodynamics enthalpy

Loong

@Wdoctor123 Because the acid can leach trace metal ions from the glass.

Matix

01:34

this should be easy.But I have no idea how to do it.Please help.

Jan

But if you have water in glass bottles, you practically always leach sodium ions anyway, don’t you?

(At least that was the explanation I was offered for why we always observe [M+Na]+ in MS)

orthocresol

But that's a good thing! Imagine all those positive ions!

Loong

@Matix What kind of result do you expect? An enthalpy in kJ/mol?

Matix

@Loong yes

Loong

@Jan Yes. And If you use ordinary acids for ICP/MS, you can see half of the periodic table.

Matix

01:38

@Loong Do we need an equation?

Jan

The other half is shy.

Loong

@Matix ok, now how do you get "something per mole" from "14.9 g KCl"?

Matix

@Loong divide it by the molecular mass

Loong

@Matix aha

Matix

its 0.2 moles

Loong

01:41

ok

Matix

@Loong how will that help?

Loong

so 3.72 kJ are released when you dissolve 0.2 mol KCl

Matix

yes

Loong

and 3.72 kJ/0.2 mol = ?

Matix

18.6

Loong

01:44

@Matix unit?

Matix

that is the answer but can you explain??

kJ/mol

why are we dividing 3.72 by 0.2?

Loong

The literature value in the CRC Handbook is 17.22 kJ/mol.

Matix

@Loong What does that mean?

Loong

@Matix You wanted a result in kJ/mol, i.e. a molar enthalpy. Your experimental value was only an enthalpy in kJ.

Matix

oh

Thank you for helping.

Loong

01:48

@Matix That means that your result has the correct order of magnitude.

Matix

Should I delete the question?

Loong

It is a homework question and could be closed if you don't show some of your own efforts in the question. Maybe you could even try to write an answer yourself now?

Bounty Hunter

03:12

4

Q: Predicting the major product formed on reaction with silver

I am facing trouble with finding out the major product when 1-(chloro(cyclohexyl)methyl)cyclopropan-1-ol is treated with silver ions: My attempt was that in presence of $\ce{Ag^+}$ the three membered ring will open forming a ketone with chlorine atom in the $\alpha$ position. Then I thought t...

organic-chemistry reaction-mechanism

Martin - マーチン

06:27

M.A.R.

06:55

@Loong ___

Morning all

skill patrol

o/

M.A.R.

09:12

@orthocresol the funniest part about this is I've seen it twice

M.A.R.

12:00

-2

Q: FIND THE PERCENTAGE OF NATURALLY OCCURING ISOTOPES

ITS URGENT EXAMS ARE COMING . IDON'T KNOW HOW TO FIND THE PERCENTAGE OF ANY ISOTOPES PLS HELP ME

ions atoms molecules

Question of the day

Loong

Isn't it also a dupe?

M.A.R.

@Loong Aw shucks. It would've gotten to HNQ.

Loong

Only if you write a corresponding answer of the day.

M.A.R.

Also I'm not sure if we can dupe something of an on-hold question.

@Loong I guess you can't even write a stellar answer to that no matter how much irrelevant/interesting info you put there

Loong

EXAMS ARE COMING, BRACE YOURSELVES!

Martin - マーチン

12:45

0

Q: How should we represent two bonded molecules of H_20?

Should we represent it like this- 2 (H_20) or should we represent it like this - (H_20) _2?

discussion

CV pls ;)

1,3-feeds

13:05

0

Q: How to handle this Li Zhi guy?

Most who have spent a considerable amount of time on Chem.SE this past year knows Li Zhi. visits on a biweekly or monthly basis: Li Zhi, et al, et al, et al, et al, et al, et al ... quality of the content of answer varies, but is sometimes alright formatting quality is terrible They never us...

discussion editing new-users

user123733

Among the following which will give tribromo derivative with bromine water

I think it should be 1) or 4)

Can somebody help me in this

M.A.R.

16:00

Hey @hBy2Py

I saw a reaction, Cr + O3 -> CrO3

Does this actually happen though?

hBy2Py

@M.A.R. boggle

Dunno for sure.

Not very familiar with ozone chemistry

M.A.R.

Should I ask a question?

I wonder if it'll get closed as homework, heh

hBy2Py

<shrug> Seems reasonable to me.

Quick google search makes me think it doesn't happen -- or, at least, it hasn't yet been well investigated.

M.A.R.

@hBy2Py The question, or the closure?

hBy2Py

Question

@ortho, I think I found your solution:

Testing further: $\Delta G^{\small ^\unicode{x29b5}} = \Delta H^{\small ^\unicode{x29b5}} - T\Delta S^{\small ^\unicode{x29b5}}$ (^{\small ^\unicode{x29b5}}) — hBy2Py 5 mins ago

orthocresol

16:09

$\Huge\require{unicode}\unicode{x2B50}$

That's a star for your message.

Nifty

hBy2Py

Hehe.

@hBy2Py It'll be system dependent, though. @Mart, how does this look on your computer and mobile?

@M.A.R. Hit or miss on whether it actually gets a satisfactory answer, though.

@Loong !!doubleflip/EXAMS

Chemobot

SWⱯXƎ︵╰(゜Д゜)╯︵ƎXⱯWS

hey

What is double flip

M.A.R.

@Martin-マーチン Argh

@hey knowyourmeme.com/memes/flipping-tables

hBy2Py

@hey "!!doubleflip/xxx" is a command to the friendly resident chatbot, Chemobot. It automatically generates various stuff.

Chemobot

16:19

˙ɟɟnʇs snoᴉɹɐʌ sǝʇɐɹǝuǝƃ ʎꞁꞁɐɔᴉʇɐɯoʇnɐ ʇI ˙ʇoqoɯǝɥƆ 'ʇoqʇɐɥɔ ʇuǝpᴉsǝɹ ʎꞁpuǝᴉɹɟ ǝɥʇ oʇ puɐɯɯoɔ ɐ sᴉ ؛ʇonb⅋xxx︵╰(゜Д゜)╯︵xxx⅋bnoʇ؛ ᴉs ɐ ɔoɯɯɐup ʇo ʇɥǝ ɟɹᴉǝupꞁʎ ɹǝsᴉpǝuʇ ɔɥɐʇqoʇ' Ɔɥǝɯoqoʇ˙ Iʇ ɐnʇoɯɐʇᴉɔɐꞁꞁʎ ƃǝuǝɹɐʇǝs ʌɐɹᴉons sʇnɟɟ˙

hBy2Py

!!welcome/hey

(Not sure what that one is)

!!hello/hey

<shrug>

hey

Nice

hBy2Py

!!gun

M.A.R.

!!greet/hey

Chemobot

╾━╤デ╦︻ԅ། ･ิ _ʖ ･ิ །ง

Welcome to The Periodic Table hey! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

M.A.R.

16:20

@hBy2Py n00b

hBy2Py

@Hippalectryon coded it; there are instructions with all the various commands somewhere.

hey

@M.A.R. thanks

hBy2Py

Oh

The instructions are at that first link in the 'welcome' message

user228700

Hi, guys :-)

hBy2Py

'ello.

Pretty slow at the moment.

user228700

16:25

Holy crap, what is this?!

orthocresol

→ 6 messages moved to Chemobot

Stuff that a moderator should not be doing. :)

hBy2Py

@Kaumudi.H This is our friendly neighborhood moderator, @ortho, poking fun at me. ;-)

(and at @Chemobot)

orthocresol

!!doubleflip/fun

Chemobot

unɟ╰(«○»益«○»)╯ɟnu

hBy2Py

See the first answer here for context:

24

Q: Main Chatroom Etiquette Guidelines

When I was walking through some of the chatrooms on the network, I found that mathematics.se has some rules for their chat. I thought this might be a good idea for us as well, hence I propose these guidelines: Have fun! Our chatroom is intended for casual conversations. There is almost nothing ...

discussion faq chat

user228700

16:26

@hBy2Py Ah :-)

M.A.R.

@orthocresol Nah, what's wrong with trying to break Hipp's bot?

orthocresol

!!doubleflip/!!doubleflip/Chemobot

Chemobot

ʇoqoɯǝɥƆ/dᴉꞁɟǝꞁqnop¡¡╰(«○»益«○»)╯¡¡ponqꞁǝɟꞁᴉd/Ɔɥǝɯoqoʇ

hBy2Py

!!doubleflip/¡¡ponqꞁǝɟꞁᴉd

Chemobot

pilfelbuod؛І9І#⅋؛І9І#⅋︵╰(゜益゜)╯︵ ⅋#І9І؛⅋#І9І؛doubleflip

hBy2Py

16:29

!!doubleflip/¡¡ponqꞁǝɟꞁᴉd/!!doubleflip

Chemobot

dᴉꞁɟǝꞁqnop¡¡/pilfelbuod؛І9І#⅋؛І9І#⅋╰(ﾟxﾟ)╯⅋#І9І؛⅋#І9І؛doubleflip/¡¡ponqꞁǝɟꞁᴉd

hBy2Py

Probably is a good thing that flipping '¡' doesn't yield an exclamation point.

!!flip/!!flip

Chemobot

◟(`ﮧ´ ◟ )¡¡ɟꞁᴉd

hBy2Py

!!flip/¡¡ɟꞁᴉd

orthocresol

@hBy2Py I see what you were trying to do...

Chemobot

16:31

◟(`ﮧ´ ◟ )⅋#І9І؛⅋#І9І؛flip

orthocresol

That would have been hilarious. Unfortunately, it was not to be

hBy2Py

Probably best I was unsuccessful.

An infinite @Chemobot loop does no one any good.

!!greet/!!greet/!!greet

Chemobot

Welcome to The Periodic Table !!greet/!!greet! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

M.A.R.

BRB changing username to !!greet/!!greet

Chemobot

Welcome to The Periodic Table !!greet! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

hBy2Py

16:32

Oooooooooooh.

M.A.R.

@hBy2Py This proves something though. That it's not sentient yet. Doesn't know what it says

hBy2Py

Hehe, indeed. "I'm sorry, I can't do anything self referential, Dave."

orthocresol

HAHAHAHA

M.A.R.

Or maybe it's trying to make us think that . . .

PANIC mode initiated

hBy2Py

!!greet/!!doubleflip/

Chemobot

16:34

(╯°□°)╯︵ ʞooqǝɔɐℲ

Welcome to The Periodic Table !!doubleflip! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

mhchem

@Linear Christmas What do you mean by "Since Chem.SE is going through 1818th-turn-1919th century Vienna in terms of typography expertise"?

M.A.R.

!!doubleflip/ʞooqǝɔɐℲ

Chemobot

Ⅎacebook＼(｀д´)／koobecaℲ

hBy2Py

!!greet/!!doubleflip/

Chemobot

╰(ﾟxﾟ)╯

Welcome to The Periodic Table !!doubleflip/! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

orthocresol

16:37

For some reason, I can't paste "Robert'); DROP $\text{table}$ Students;--" into a message.

@mhchem Your ping doesn't reach him/her. :(

hBy2Py

@mhchem Since they haven't been in chat for longer than a week. Will need to leave them a comment on the post, linking to your question here.

orthocresol

A user has to be active in chat within the last $x$ days for them to be ping-able. The exact rules are a bit complicated, but since Linear Christmas has never been in chat (as far as I know), they aren't pingable.

mhchem

@orthocresol I thought so, because his/her name did not come up as a suggestion.

Ah, good to know. Thanks.

M.A.R.

@mhchem They're not the same thing though

hBy2Py

@orthocresol Oh, it's not a fixed value? I always thought $x=7$ strictly.

orthocresol

16:39

Moderators can bring them in ("superping"), but it's generally reserved for when there's a good reason to do so.

M.A.R.

@hBy2Py Yeah, that's correct

orthocresol

I think that's if you use the full username, right? If for example I type @hBy then there's some other rules, but I don't really remember.

hBy2Py

No... I thought that the pingability was always just $x=7$.

The usability of the abbreviations just depends on who all is pingable

orthocresol

shrugs

hBy2Py

You have to put enough characters to ID the ping target unambiguously.

That's been my experience, anyways.

orthocresol

16:42

never liked meta.SE, 90% of the questions contain outdated info

grumbles and blames others for me not knowing

hBy2Py

I always try to be sure I post a message in chat at least once a week.

@orthocresol Knowing things about SE is tricky

Is a gripe I've had since very early in my time here.

There's no good central repository of useful tidbits, at least not that I've found

I've had to just ask other people in the community to get most info.

Which, y'know, is fine

orthocresol

Generally this is the best place to find out anything you want to know about chemistry or about SE.

hBy2Py

But there've been multiple instances where some quirk of the system has really surprised me or really irked me, and I've brought it to, e.g., Mart while upset and been a lot more crabby than I really needed to be.

@orthocresol Hehe

Loong

@orthocresol ?

hBy2Py

!!greet/Loong

Chemobot

16:52

Welcome to The Periodic Table Loong! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

Hippalectryon

@hBy2Py not possible

Chemobot doesn't respond to his own messages

Alpha Romeo

Does benzyl group have +I or -I inductive effect?

hBy2Py

@Hippalectryon Hm... I think he actually does...

OH

No, he was responding to @M.A.R.'s message, not his own.

Hippalectryon

:P

hBy2Py

FAKED OUT I WAS.

!!flip/BEING FAKED OUT

Chemobot

16:57

( つ•̀ω•́)つᗺƎIN⅁ ᖵⱯ⋊Ǝᗡ O∩⊥

M.A.R.

@hBy2Py You didn't ping him. New people usually get confused.

hBy2Py

I didn't mean to ping him

M.A.R.

@hBy2Py 3

hBy2Py

I was trying to respond facetiously to his "?"

@M.A.R. No, I can ping you with @M.

See: @M.

And Hipp with @Hi

And Loong with @L

M.A.R.

@hBy2Py i.imgur.com/Z2pnbSp.webm

Hullo @Line

Linear Christmas

17:04

Hello-hello

hBy2Py

Oh - did that not actually ping you?

M.A.R.

@hBy2Py It doesn't

hBy2Py

>.<

M.A.R.

It didn't

Linear Christmas

I still prefer to call yoy @TIPS though ;)

hBy2Py

17:05

!!doubleflip/UNCLEAR USER INTERFACE

Chemobot

ƎƆⱯᖵᴚƎ⊥NI ᴚƎS∩ ᴚⱯƎꞀƆN∩︵╰(゜益゜)╯︵ ∩NƆꞀƎⱯᴚ ∩SƎᴚ IN⊥ƎᴚᖵⱯƆƎ

Linear Christmas

@mhchem I was referring to Beethoven and Mozart somewhat loosely

M.A.R.

@LinearChristmas Heh, why's that name memorable?

Linear Christmas

The name resonates kindness for some reason (perhaps for your comment on my first meta post)

M.A.R.

Sheds tears so dramatic

Linear Christmas

17:08

and I wondered where you disappeared to for some tine :/

so many emotions I know right

M.A.R.

Missquerada Far From Love

►

Linear Christmas

Ahh... you can be MAR if you'd like ;}

good song choice

that might've backfired

user123733

Among the following which will give tribromo derivative with bromine water
I think it should be 1) or 4)
Can somebody help me in this

@M.A.R. You there

mhchem

18:09

@LinearChristmas Ah! Wow! So it was neither a reference to "Hygienic problems began to become noticeable: sewers and street cleaning began to develop." nor "During the Napoleonic Wars, Vienna was taken by Napoleon twice" :-)

Linear Christmas

18:33

@mhchem Not this time, no ;)

Hopefully not any time in the future either really

orthocresol

Well, you guys want some meta reviews?

0

Q: Is it a good idea to build a small scale ozone AOP reactor in my garage?

I have some interesting findings from my work (no conflict of interest), and I have been thinking to build an ozone lab in my garage to verify my ideas. What safety issues should I be aware of? The purpose of the lab is to study some water/wastewater treatment process with ozone injection and a...

discussion experiment safety

Loong

@orthocresol Is it a good idea to build a small scale question on meta?

orthocresol

@Loong No, but it is a good idea to have a small scale campaign to close it as off-topic.

Loong

in my garage?

orthocresol

renames room to Loong's Garage

Loong

18:42

> Is it a good idea to build a small scale reactor in my garage? – E. Fermi 1942

M.A.R.

room topic changed to Loong's Garage: Haikus are awesome / Chemistry's even better / So pull up a chair [blowing-the-lab-up] [german-stuff] [hullo] [love-you-all] [martin] [table-flipping] [tre] [welcome]

@orthocresol You're just all talk

and no action

Loong

closes the garage door as off-topic

And don't sit on my summer tyres!

M.A.R.

Too late

My butt's turned black

M.A.R.

19:01

meta.chemistry.stackexchange.com/questions/3597/…

Sometimes communication works

Surprisingly

CowperKettle

LOL at chatroom name

M.A.R.

@CowperKettle IKR, my humor is really underappreciated

Loong

room topic changed to The Periodic Acid: Haikus are awesome / Chemistry's even better / So pull up a chair [blowing-the-lab-up] [german-stuff] [hullo] [love-you-all] [martin] [table-flipping] [tre] [welcome]

M.A.R.

19:29

5

Q: Chromium + Ozone Reaction Products?

I know almost nothing beyond 10th grade chemistry. I'm trying to name a web application, and was wondering what the products are of a reaction between the element Chromium and the gas Ozone (ozonolysis of chromium?).

inorganic-chemistry reaction redox

CC @hBy2Py

hBy2Py

19:51

@M.A.R. He clearly should've named the game "Chrozone"

orthocresol

20:06

Chromozone

Now that sounds like a biology game.

Loong

Chronozone

A chronozone or chron is a slice of time that begins at a given identifiable event and ends at another. Such tracer events are usually keyed to the disappearance (extinction) of fossils of a widely distributed and rapidly changing species or the appearance of such a species in the geological record. Researchers use chronozones or chrons especially frequently in the various disciplines related to geology, notably in stratigraphy where they contribute to relative dating. Events susceptible to identification and analysis by the physical sciences (such as Earth's magnetic-field reversals or the location...

off-topic, belongs on Earth Science

hBy2Py

20:30

Since you're both here, @ortho, @Loong, may want to keep your eye on this one:

2

Q: What is the quantum mechanical explanation of X-ray diffraction?

One topic in crystallography that I've found a surprising dearth of information on is what the fundamental interaction behind the interaction of the X-ray and atom. Pretty much every book just treats them as classical waves instead of explaining the quantum mechanics behind it. By this I don't me...

quantum-chemistry electromagnetic-radiation x-ray-diffraction

Though, @ortho, you've already seen it, with that edit.

Loong

hm

orthocresol

What about it, the comment section?

Oh, I see.

M.A.R.

@hBy2Py ?

orthocresol

I agree that it could potentially get better responses on Physics, but I thought it was still on-topic here. Thanks for the heads up though.

M.A.R.

I don't see any serious issues

orthocresol

20:36

(perhaps I am biased, because I like QM and EM wave/matter interaction is a topic that we are about to study soon; I actually upvoted the question (oops))

orthocresol

21:56

@orthocresol so we can substitute this resonating thing at that C and expect a randomized chirality if we extract it? The C(-NH=ring)(-NH+-ring)(-NC7H5OF3-CH2-)(-SO) looks like a floppy chiral center if the product of reaction 1 resonates like that, if the (-NH=ring) and (-NH+-ring) are not required to be symmetrical. — sqykly 6 mins ago

What is this guy trying to tell me...?

orthocresol

22:15

I should not have replied to his first comment.

The phrasing makes it really difficult to understand what he's trying to say.

Loong

23:16

in The Bridge, 2 mins ago, by Wipqozn

5

Jan

Must … star … pun … must … star … …

orthocresol

Have you guys seen this one? $\large \frac{\ce{NaCl}}{\ce{NaOH}}$

3

Jan

4 mins ago, by Jan

Must … star … pun … must … star … …

orthocresol

"The base is under assault!"

:D

Loong

All your base are belong to us.

orthocresol

23:29

A winner is you!

Transcript for