The Periodic Table

12:00 AM

That's why I have a problem. And I don't know then how to write my mechanism

Can I write an attack from my alkene double bond on the aldehyde without have trouble with the teacher after an exam ? ^^

orthocresol

Probably not.

Jan

What’s wrong with writing a chelate like ortho did and then having the formal carbanion (where magnesium is sitting) attack nucleophilicly along the Bürgi-Dunitz trajectory?

gannex

look at that velvety redness

orthocresol

lemme guess

2-nitroaniline or some derivative thereof?

gannex

1,3-bis(diphenylphosphino)propanechloronickel (II)

orthocresol

12:07 AM

damn

gannex

srry i didn't let u guess my bad

orthocresol

never mind, I was incredibly off anyway :P

gannex

n nitroanilines would be way more crystally

this is a fine powder

also, more orange or orange-red than velvet cake red

Hexacoordinate-C

@Jan This is a little bit tricky to draw

gannex

now... I have to figure out how to assign the damn thing's IR spec.

Hexacoordinate-C

12:09 AM

@gannex easy O:)

gannex

yeah i know

Hexacoordinate-C

Do it with EPR to see what happends :P

RPE*

gannex

no access to an EPR right now

Hexacoordinate-C

NO

orthocresol

I know what EPR is, but not RPE o.o

Hexacoordinate-C

12:11 AM

In english this is EPR ^^

RPE is in french

orthocresol

Ah, I see

Jan

> I was at a real loss trying to ignore NMR data and justify IR data. However, now I am happy to do what I normally do, and ignore the IR data and explain by NMR. (source.)

One of my favourite quotes from the answers sections of Chem.SE.

gannex

hmm what are these huge bands a 21599 and 2028

Hexacoordinate-C

@gannex where do you see them

gannex

2159 and 2028

Hexacoordinate-C

12:16 AM

Still don't see where you're looking

^^

gannex

whdya mean where?

Hexacoordinate-C

Are you speaking about what Jan shared ?

gannex

no I'm talking about my IR

Hexacoordinate-C

OH ok ^^

gannex

:P

back to work for me!

Hexacoordinate-C

12:18 AM

Going to sleep for me soon

Jan

@gannex chloridonickel(II). Also, it’s missing a counterion if it’s just chlorido (and not dichlorido).

Hexacoordinate-C

12:36 AM

sciencealert.com/…

gannex

12:56 AM

oh I was being a dummy

it's probably the metal metal bond

oops

no I'm thinking of something else

@Hexacoordinate-C what do you think about the Planck length? The possibility that there might be a "time atom" makes me think that the idea of us moving as 3D "frames" through a fourth dimension. I guess the planck length is just the length of a time frame

and then does that mean that Zeno's paradox would be solved if the existence of the planck length could be proved?

Hexacoordinate-C

1:21 AM

For me time does not exist and it is just an artefact for calculus because it's easy for the brain. Also sometime I share some articles which I think are amazing but I don't know everything about them. I don't know what Zeno's paradox is

Oh I know

Zeno = Zénon ^^

Well Zeno paradox is not really a paradox since we know this is possible for an infinite sum to converge

gannex

tu est FrançaisÉ

?* :P

Andrew Li

Is there a reason why NH4 is named ammonium? It doesn't seem to follow the rules

gannex

does anyone know how to figure out IR vibrations of weird bonds like Re-Re or Re-Cl?

are there like estimated force constants I can use? idk how to deal with this delta bond.

Jan

It follows ammonia. Which is retained traditional naming afaik.

A~nd I’m off top bed.

gannex

nite Jan

CowperKettle

2:36 AM

In gas chromatography (capillary), do they call it "evaporator temperature" or "injector temperature"?

I come across evaporator temperature, but this might be by non-native English speakers

Melanie Shebel

5:22 AM

Is there a website where I can just "discuss" chemistry? I have a lot of doubts regarding my ability as a student and I feel like having a forum/open outlet would be good in helping me determine whether graduate school is something I should pursue. (I feel dumb all the time.) :S

4

Melanie Shebel

6:02 AM

Anyone want to retitle this? It needs it, but I'm at a loss for what to title it:

1

Q: Why would this chemistry reaction happen?

So, I am a first year chemistry student and I saw this chemistry reaction on a previous year's test. I attempted to figure out the mechanism, but I'm rather confused as to how the cyclopentane somehow donates a carbon to the cyclobutane? Why would such a rearrangement occur? That is how far ...

M.A.R.

@MelanieShebel Like, chat about whether or not to pursue chemistry? I don't think reliable advice about that can be found on the internet.

@MelanieShebel Something like ''Why would this rearrangement happen between cyclobutane and cyclopentane?'', using OP's words

chemistry.stackexchange.com/review/suggested-edits/45895

BTW, @Melanie, technically that upper case title was better, but I'll leave it at that

-4

Q: calculation of concentration from 2 pH points and pka : CHALLENGING

This is 4000 level pH problem. It is not a simple pH practice problem A 10ml solution of Acetic acid has a pH of 2.250. Next, 0.001 mol of solid sodium hydroxide is added to the solution. The solution now has a Ph of 3.526. The Ka of Acetic acid is 1.730*10^-5. What was the concentration of Acet...

physical-chemistry

CHALLENGING PRO VITAL 4000 IS ON SALES NOW

CowperKettle

(0:

CowperKettle

7:46 AM

Can we say about a headspace vial (in gas chromatography) that it was "equilibrated at 90°C for 20 min"?

A Russian guy with a PhD in chemistry says that this is the correct phrasing.

I do not believe him though on this count.

M.A.R.

7:58 AM

@CowperKettle I think so

Stationary and mobile phases are in an equilibrium in has chromatography

CowperKettle

@M.A.R. Isn't this strange "equilibrate" + 20 min?

The verb "equilibrate" is not "extended in time", IMHO

M.A.R.

Mhm.

The little I studied about chromatography wasn't in English, so let's wait for other responses.

CowperKettle

I prefer "incubated at 90C for 20 min"

CowperKettle

8:19 AM

I wonder if I can write "Dissolve the sample ultrasonically for 18 min"

Again the verb is not continuous

While in Russian "dissolve" can be used thus

It's minus 25°C, I'll try to ride my bicycle several blocks to a friend.

(0:

Will probably need the ski mask

orthocresol

11:18 AM

@CowperKettle Damn... it's 3 deg C here and I'm already nearly dead.

Maybe, "the sample was dissolved with sonication"? But I'm not sure, I've never written anything about sonochemistry before.

M.A.R.

Tags for this?

0

Q: formaldehyde strong odor neutralization

One of our customers used a very high dose of formaldehyde 37% solution (60 liter formaldehyde in 40 liter water) for disinfection in his chicken farm (saloon). Now he says the odor of formaldehyde is very strong and can`t start breeding season. How can I help her? Can he neutralize formal...

everyday-chemistry applied-chemistry

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koolman

11:35 AM

What does binary fluorides mean

Martin - マーチン

@orthocresol Batman!

Na na na na na na na na na na na na na na na na... BATMAN!

►

getafix

12:33 PM

Sodium Sodium Sodium Batman

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Q: How to correctly write "7 apples" according to the international system of units (SI)

According to international system of units, we can write "7 kg of apples" to refer to the mass of these apples. However, if we want refer to the amount of apples, that is, the number of entities, the unit should be the mole. Thus, how to write correctly "seven apples"? ** Addendum ** Is i...