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00:00 - 18:0018:00 - 00:00

6:00 PM
Let's throw it behind the backlog. I'll get to it in . . . three years.
 
@M.A.R. too broad?
 
Mayhaps
@orthocresol But we should perhaps have a meta post about why people can't insert coins and get reaction or chemical recommendations out. As I said, in three years
 
yeah
 
0
A: How to determine the mole fraction of the liquid phase from a given mole fraction of the vapour phase for a benzene/toluene mixture?

Nathan VishwanathanAccording to Raoults law, it should be 0,25. Lets say, you have the molar fraction of each component in vapor, and lets say you have the saturated pressure at some temperature, than according to Raoults law you can say: 0,53(molar fraction of benzene in vapor)Pi(which is equal to Xbpb(saturated, ...

Somebody edit this train-wreck
 
@M.A.R. Did anybody try the "insert coins" part yet?
 
6:11 PM
BTW, do we have a meta post on which set of notations to use? I mean, for example, should the separator be a comma, or a dot? What should be the decimal separator?
 
@Loong .oO(Maybe we should emphasize the "not free" part of "not a free homework service".)
 
Loong is talking to himself. What's the next step for this site? Ortho getting mad, beheading other mods digitally, and claiming the throne for himself?
 
70 days left before my first gold badge ^^
 
@Hexacoordinate-C You can spend some time voting, and you can get it sooner
And a rarer badge too
 
?
Which one ?
 
6:16 PM
Electorate.
 
Also I don't understand what i need to do for the "electorate" badge
 
Vote.
 
But there is a 25% of something too
 
You should vote on 600 questions.
@Hexacoordinate-C Yeah, 25 percent of all your votes should be on questions.
That's not hard if you consider voting for the question always when you found the answer useful.
Chem hardly ever gets more than three answers per question.
 
So I need to like 75% of question and 25% of answer when I vote ?
That's weird
 
6:19 PM
@M.A.R. I guess, the choice of the decimal is associatied with the lanuage, and the language on this site is English. It is customary to use the decimal point in most documents written in the English language.
 
Hi everyone
 
\o
 
@Hexacoordinate-C No, out of every four votes you cast, one should be on a question
 
@Mithoron hi
 
6:20 PM
25 percent question, 75 percent answer. At least
 
That's pretty easy since you can just watch the newest questions and downvote the stupid ones that don't get answers. That way, you've helped with moderation too.
@Loong So a comma decimal separator is evil
 
And for the moment I am at 60/600 for this badge so what does it means ?
 
@Loong Took me too long to understand what you were saying...
 
6:22 PM
@Hexacoordinate-C You have voted on 60 questions thus far
 
@M.A.R. not really evil, it's permissible according to SI and ISO; however, it's not customary in the English language
 
NO IT'S EVIL BECAUSE I SAID SO
 
I have only voted on 60 questions ? :O I thought it was much more
 
> all time by type month week day
112 up 61 question 57 48 2
17 down 68 answer
These are votes you've cast up to now.
You have 129 votes, 61 of which are on questions.
Almost half. That's not hard to keep up.
 
So next month I will only vote for questions
 
6:27 PM
No need to.
Just vote as you normally do.
 
OK but I still don't understand what 60/600 means
I need to reach 600 questions OK ^^
 
@Hexacoordinate-C They couldn't have made it more confusing even if they wanted to.
 
Hum
Well now I'm at 71/600 but I don't know why lol
 
Because you voted?
 
Yes I doing some experiments
 
6:37 PM
@Hexacoordinate-C Oh, you mean it should be more? Don't worry, it's just caching.
shouldiblamecaching.com
 
I voted on 15 question i got 71/600 15 more and still 71/600
I can't see your page
 
Big Yes
In 20 days then I'll get it ! ^^
 
\o/
 
Well still not sure how it works
I'm at 91/600 now
 
6:58 PM
You can go to your profile, the ''activity'' tab.
There you can see how many votes you cast.
 
 
1 hour later…
8:01 PM
@pasaba_por_aqui - This has nothing to do with the unit moles. You use moles to count atoms and molecules, not apples. — MaxW 3 hours ago
One mole apples have about the same mass as our moon.
 
@Loong With each further comment, my now-deleted comment seems the more logical conclusion to go.
 
@M.A.R. I see; however, that would probably be a dupe.
9
Q: What advantages does the mole have over counting large numbers using SI prefixes?

user1318499I'm trying to understand why chemists use the mole unit instead of just counting and using SI prfixes to simplify the big numbers with units such as zetta- or yotta-molecules (yotta=10^24). Here's what I've found so far, but it doesn't seem to be enough to make moles particularly important: Rea...

10
Q: Why do people still use the mole (unit) in chemistry?

Ali AbbasinasabI know that the mole is widely used in chemistry instead of units of mass or volume as a convenient way to express amounts of reactants or of products of chemical reactions. I'm wondering why people in chemistry still excessively use it for their measurement? To be backward-compatible and consis...

8
Q: The mole is used extensively in chemistry, why not elsewhere?

EkaIn chemistry, the unit "mole" is used in many places, and is an important tool when working with quantities. I have not seen it used elsewhere--for example, we never count people or TVs with the unit. What makes the mole so useful in chemistry, and why isn't it used elsewhere?

or this sloppy thing: what-if.xkcd.com/4
 
I had a feeling there was lately someting very similar but didn't found it
 
8:42 PM
Title of the day
Shucks, it was removed.
Here it is from ELU chat in its last moments, in all it's glory
in English Language & Usage, 3 mins ago, by M.A.R.
-11
Q: i need the main plzzz im new

Alba Traozla méthode principale est introuvable dans la classe Bouton, définissez la méthode principale comme suit : public static void main(String[] args) import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.G...

 
Jan
@M.A.R. Wow, just … wow.
 
@Jan does that trigger some triggers in ya?
Do you wish to flip one herd of tables right now?
 
Jan
!!flip
!!doubleflip
 
( ノo|o)ノ ┫。゚:.:
(╯ ・ ᗜ ・ )╯︵ ┻━┻
 
Jan
!!doubleflip/pilf!!
 
8:48 PM
¡¡ɟꞁᴉd╰(«○»益«○»)╯dᴉꞁɟ¡¡
 
Insanifying Jan complete. Initiating sending Jan to Arkham
22
Q: A 17th century colloquial term for children, in the way we use 'kids' today

JudeI'm looking for a A 17th century colloquial term for children, in the way we use 'kids' today. The best I've yet found is striplings, which seems to connote male teens more specifically, or possibly goslings.

 
Jan
But I’m not Bruceman!
 
@Jan Brucemen no lying
 
@Jan Maybe you can find more reasons, e.g. if you include K for kelvin.
 
Jan
But you could increase the count if you decided reputation (symbol: rep) be a unit.
 
8:57 PM
Hm, 1000 rep = 1 krep, which sounds like crap.
 
Jan
You know why it’s called rap music, don’t you?
 
Hmm I got 1 rep point in some sneaky way
 
Jan
@Mithoron Undownvoted?
 
@Jan Probably sth I downvoted was deleted
 
Jan
That’s a rather boring way to get 1 rep (or 0.001 krep) if you ask me …
 
9:02 PM
Not particularly satisfying ;)
 
9:14 PM
Ha! I edited and undownvoted old post, now that's better :)
@Hexacoordinate-C o/
 
Hey
I'm on shapiro's reaction
A kinda wff
 
@Mithoron sneaky ;-)
 
@Hexacoordinate-C Huh?
 
The mechanism is really uncommon for me
Four arrow in the same step lol
 
9:19 PM
The Shapiro reaction or tosylhydrazone decomposition is an organic reaction in which a ketone or aldehyde is converted to an alkene through an intermediate hydrazone in the presence of 2 equivalents of strong base. The reaction was discovered by Robert H. Shapiro in 1967. The Shapiro reaction was used in the Nicolaou Taxol total synthesis. == Reaction mechanism == In a prelude to the actual Shapiro reaction a ketone or an aldehyde is reacted with p-toluenesulfonylhydrazide to a p-toluenesulfonylhydrazone (or tosylhydrazone) which is an imine or hydrazone. Two equivalents of a strong base, such...
 
I have my last organic chemistry exam monday morning, I need to be the best :D
Five arrow there
Well I got it it's okay
I'm doing the around 180 reactions I have on my lessons haha
It's a 36h organic chemistry week end
 
Hmm rather tricky reaction
Probably there's no free anion intermediate.
But who knows...
 
Well most of them are trivial for me now, but I prefer do mechanism of all of them to check if I have no problems. I have not the mechanism on my resume sheets that's the better way I found to see if I'm understanding organic chemistry. The only problem I have is when to do O or C alkylation.
 
@Hexacoordinate-C Like with that polyphenol thingy?
 
Like with everything in which you can think of both ^^
My teachers said most of the time we will have to do C-alkylation so in general if I have really no idea I do it and I hope I'll be lucky boy ^^
 
9:34 PM
Well it may depend on experimental details. It's not like you can foresee everything
 
Fortunately we have some intermediate or final structures with some spectroscopy infos sometimes
I hope in some decades we will able to know exactly how things happend at quantum scale during reactions. I know there are a lot of experiements to try to see how electrons exactly move after that everychemist would have the possibity to have just few hours of organic chemistry to understand everything :D
(Sorry my coma key doesn't work very well)
 
10:04 PM
Hello @BrentKylling
 
!!greet/BrentKylling
 
Welcome to The Periodic Table BrentKylling! 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!
 
I don't see how decarboxylation occurs from 3 to 4
 
10:20 PM
@Hexacoordinate-C I guess it's hydration/elimination - ketoacid is created then thermal decarboxylation
 
I have a diol lol
Where do you attack with water ?
Or I get a "cyclopropane" with a negative charge
Then it takes a H+ from water
 
Acid neutralises diolate and eliminates it
 
Oh yeah
with enol keto equilibrum then
hum no
Hum :/
 
i think you just lose CO2
wait I'll draw it out
 
Yes but what about the epoxyde then ?
 
10:29 PM
@Hexacoordinate-C Yes tautomerism to keto
 
Yes
sorry
 
It's okay
 
@orthocresol You wanna shortcut ;)
 
yeah
 
Jan
10:32 PM
@Mithoron It’s the mod-button way of doing mechanisms/chemistry.
 
I like to be answer by an undergraduate lol
We have not the same brains
 
Jan
Would be very scary if you had. But you don’t like fish that much, do you?
 
@orthocresol There's clearly base acid and temperature so author doesn't agree with you
 
@Jan why do you speak about fish ?
 
So no shortcut...
 
10:34 PM
I likes fish
I like*
 
Jan
Because seals do, too, don’t they?
 
@Mithoron so you say it opens to give a vicinal diol, elimination of H2O, tautomerisation to ketone and decarboxylation?
 
@orthocresol Yeah
 
Jan
If you’re going to get the vicinal diol, why not a pinacol rearrangement?
 
10:38 PM
No pinacol rearrangement
 
I see what you mean, I was just looking at 3 to 4, not 2 to 4
 
I don't want to do omething more lol
Seriously @orthocresol you're not a teacher or at a higher level ? Because when I'm reading that chemistry.stackexchange.com/a/50438/15235 ugh ... or maybe you have a very great lesson about quantum mechanics
 
pubs.acs.org/doi/pdf/10.1021/jo00832a021 <-- seems to contain the answer, although I'm not reading it right now
 
Jan
@Hexacoordinate-C Speaking of that answer, why didn’t I bounty it yet?
 
10:44 PM
Thank you orthocresol
@orthocresol how much hours have you got in class each week ?
 
@Hexacoordinate-C Right now? We have 12 lectures a week.
I think you can see for yourself, actually: chem.ox.ac.uk/timetableweek.asp?Date=22/11/2016&Year=3
 
Jan
Still thinking about the assumptions I can make to answer this.
 
How much time it takes ?
If it's 2h per lecture you have lot of free time lol
I have 35h a week + prepration of experiments + preparations of exercices + projects lol
 
it's 1 h per lecture, but obviously there's work outside of lectures
Because I'm smart I don't have to do labs this year.
 
That's why you must be better than me.
 
Jan
10:48 PM
W-w-w-work outside lectures? O___O'''
 
So it's just tutorials.
@Jan Of course, moderating is a job too, you know ;)
 
12h a week you have time to improve your skills
I just have time to learn no time to go deeper on things
 
I spend some time on music, some time on cooking...
 
I guess even best student of my school is not as smart as you
I must learn to languages at my school like if I had time for that lol
 
10:53 PM
Music is ok for me ^^
There are so many forums on SE
Even on coffee
 
12
Q: Why is manganese(II) coloured although the transition should be spin-forbidden?

JanIn every basic coordination chemistry class, at some early point the crystal field theory and LFSE will be taught, explaining that there will be an energy difference between d-orbitals (typically named $\mathrm{t_{2g}}$ and $\mathrm{e_g}$) and that electrons can be excited from one to the other t...

 
10
Q: Can you use just egg yolks when recipe asks for eggs?

scottishpinkHaving just made a batch of meringues,I am now left with lots of egg yolks, can I use them in recipes that ask for "eggs" i.e cakes and tray bakes. Is the white of the egg needed in the baking process ?

Makes me angry
 
Jan
@Hexacoordinate-C Yet trains are still missing
86
Railways & Railroads

Proposed Q&A site for railway enthusiasts, modellers, preservationists and others interested in railways & railroads, both full size and minature

Currently in definition.

 
hungry *
woops
@Jan ?
If you say a joke I don't understand it
 
Jan
It’s a fact. There’s no site for trains on SE yet.
 
11:01 PM
And I cannot click on everything on the area51 page
Oh ok. Well I like trains in fact
 
Jan
Do you know how Area51 works?
 
Never go on Area51 yet (nor the Area51 neither the SE site) ^^
Yes exactly what I was thinking for trains @Jan haha
 
11:17 PM
@Jan hmm, I'll add those to my list of "networks-I-join-but-never-contribute-in"...
I might contribute in music a bit. Heh. But it seems to be mostly guitar/piano. Not surprising, since those are probably the most common instruments.
I'm a violin/flute person
 
I'm a piano teacher person O:)
The best instrument
:D
 
Meh... you're only useful as an accompanist.
 
Everything can be play on imperial bosendorfer
96 keys
 
11:28 PM
Hey orthocresol
 
@Hexacoordinate-C You don't even know what intonation is, do you? Pfft.
@MichaelHarding Hi :)
 
Hiya :)
I read your bio on stackexchange, and I saw that you're a 3rd year undergrad at Oxford - I've applied, and got an interview from St Edmund's Hall in December. Though I feel like I don't stand any chance of getting in ahah
 
Intonation, in music, is a musician's realization of pitch accuracy, or the pitch accuracy of a musical instrument. Intonation may be flat, sharp, or both, successively or simultaneously. == Interval, melody, and harmony == The lower or upper pitch of an interval may be sharp or flat, or both pitches of an interval may be out of tune. If the lower pitch is sharp or the upper pitch is flat, the interval may be said to be flat given that as a whole it is too narrow; while if the lower pitch is flat or the upper pitch is sharp, the interval may be said to be sharp given that as a whole it is too wide...
 
Naturally, I now have so many questions :')
 
@MichaelHarding nice! Getting the interview is already half the work.
 
11:31 PM
But there are many answer
 
@Hexacoordinate-C You just hit keys and if they're too sharp or too flat, you hire someone to fix it for you. Sheesh.
 
What's Chemistry at Oxford like then? Any advice for the interview? I've just been doing Olympiad papers as you can see. I quite enjoy doing them, especially the more mathematical questions
 
@MichaelHarding I think you'll probably get by quite well by doing Olympiad papers.
I checked who the Teddy Hall tutors are ;D
 
Ahaha, do you know them?!
 
11:34 PM
David Manolopoulos and Philip Mountford... you're in for quite an interview
 
... How so :')
 
They're both really smart
but they're great guys
 
What college are you at?
 
Ummmmmmmmmmm.......... not ready to disclose my identity yet :P
 
Jan
Damn, I was getting my hopes high xD
 
11:35 PM
Ahahaha, that's fine :p
 
As for the interview, they just try to make you think on the spot.
Essentially they're looking for people with logical train of thoughts.
I made a huge careless mistake in my interview
(I'm a foreign student, so it was a Skype interview.)
 
Yeah, I've heard they don't care so much about what you know or can recall, but how you work through a problem, that's why I chose Olympiad papers.
 
Careless of whisper
 
Anyway, my tutor asked me to write a balanced equation for the combustion of C8H18.
Me, being very smart, decided to do mental maths to work out what (x + y/4) was
and of course I got it wrong
But they didn't really seem to care, since I could explain what I was trying to do :)
 
Ah, so if I spoke out loud, going through my thought process, that should help out
 
11:38 PM
The questions can be easy or hard. It kind of depends what the tutors feel like asking.
Yeah, that would be great.
Apparently though, once upon a time my tutor posed this question: "Can you give me an example of an inorganic solid?"
 
Jan
If there’s one most important lesson I always tried to hammer into my extra-lesson students, it was always to think out loud in oral exam settings.
 
After letting the student think for a long, long time, my tutor hinted: "Well, what do you sprinkle on your chips?"
 
I'm trying to teach AS Chemistry to a GCSE student that I know to practice speaking out loud and explaining Chemistry
Ahahaha!
 
And the student went: "um... ketchup?"
 
11:40 PM
I can go in Oxford !!!!!!
:D
 
That's quite funny :p
 
Jan
I can haz cheezburgas with chips? =D
 
How much do they ask you about your personal statement in the Oxford interview?
 
!!wiki/haz
 
Haz or HAZ may refer to: == People == Hamzah Haz (born 1940), Indonesian journalist and politician, ninth Vice President of Indonesia Mark Hazinski (born 1985), American table tennis player == Other uses == Haz, Yemen Hannoversche Allgemeine Zeitung, a German newspaper Hazaragi dialect of Persian spoken in Afghanistan Hazardous material Hazel Grove railway station, in England Hazlehurst station, in Mississippi, United States Heat-affected zone in welding...
 
11:41 PM
My tutors asked me absolutely nothing about it.
 
Jan
But don’t you have the kind of practical jokes, like sending an undergrad to go and fetch three phenol rings?
 
I'm not sure whether they are supposed to ask about it, actually o.o
Oh no. I think they can if they want to. But they're not allowed to ask why you applied to Oxford, or why you applied to this particular college (if you applied to a particular college).
In any case, I think if you got through to an interview, then the personal statement did its job already.
 
I put quite a lot of things that could be fair game for discussion though - I spoke about Heisenberg's uncertainty principle, a bit on hybridisation and MO theory
 
@orthocresol Heh, I wonder why so many combustion example problems use C8H18.
 
HUP and Manolopoulos. That'll be fun...
 
11:43 PM
I also spoke about the Beer Lambert law cause I did this Schools' Analyst competition where we had to create some beer plots from the data we got, and then find out the concentration of the two substances
Ahahaha :')
I enjoy talking about it though, I didn't put it in there without having any idea what to speak about, so hopefully it won't be too bad if they ask me about it
 
I like to do brominatin of carrot juice
 
Yeah. You sound like you'll be just fine.
 
It makes a rainbow reaction
 
We had to do an admissions test this year though :')
 
bromination*
 
11:45 PM
It was the first time they used an admissions test for Chemistry
And it wasn't even a Chemistry related one, it was the TSA...
 
Hmm, I didn't hear about that...
 
It's the admissions test that PPE, Economics etc students had to take
It's stupid
I think it was used as a 'trial' though, since I emailed the Chem department at Ox and they said that they wouldn't use it substantially to shortlist candidates.
 
Admissions stuff isn't public, as far as I know. Don't recall seeing anything about this.
Oh well...
 
"This year, candidates applying to study Chemistry (F100) will be required to take TSA Chemistry as part of their application. TSA Chemistry is a 90-minute test that consists of Section 1 of TSA Oxford (50 multiple-choice thinking skills questions) only. Test-takers will not be required to take Section 2 (the writing task).
Applicants for Chemistry must ensure that they are registered to take TSA Chemistry."
They seem to like to ask about the Lennard-Jones potential in interviews, apparently
 
Maybe they just use it to weed out the really bad or something.
 
11:53 PM
As in sketching the graph, then suggesting an explanation etc
 
I see
 
Although I'm quite rusty on my graph sketching
How much maths do you remember being in your interviews?
 
None
 
Really?!
 
The other thing I was asked was a qualitative description of the van der Waals model
(non-ideal gas)
As well as some stuff about phase diagrams, asking me which section was which state of matter
 
11:54 PM
Oh that dosen't seem too bad
 
You get lots of maths lectures in first year, so I don't feel like they worry about it too much in interviews.
 
My Chem teacher kept on insisting I went over my C3/C4 integration differentiation
 
Essentially in first year you take inorganic, organic, physical, and maths
 
Ah, yeah.
 
Calculus is important, but you'll get tons of practice on it.
 
11:56 PM
I'm doing further maths and the stuff that you seem to do in the first term and a half or so seems to be studied in further maths A-level
 
To a certain degree, yeah
 
Jan
I was about to comment on how Munich does things differently when I realised you talk in years, not in semsters …
 
I love calculus :D
 
Great, that puts you one step ahead of the rest.
Most people hate it :D
 
We're starting FP2 differential equations on Monday, I'm excited ahaha
Really
Idk how calculus is at university level, and what extent they teach it to for Chem
I've looked at partial differentiation and differentiation from first principles and it genuinely looks really interesting
 
11:58 PM
Well, it's not a maths course. So it's not quite as formal as you might expect.
 
As an international student did you sit A-levels then, or did you do another qualification before you went to Oxford?
 
I did A-levels.
 
Ah, so Chemistry, Maths, what were your other subjects?
 
Biology and Economics.
 
I did AS bio last year, and hated it :')
 
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