The Periodic Table

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Rick

20:07

@Zhe but there are some reactions whose mechanism we don't know for sure...Like oxymercuration?

@Tanuj sort of, if it follows Meerwein addition

Tanuj

@Rick hmm okay

guys , in case of carbocation which one is more stable...attachment of carbon with nitrogen or attachment of carbon with oxygen ?

Abcd

@Tanuj oxygen is more electronegative

so I think that the double bond formed due to resonance (conjugation) in case of oxygen would be stronger

Tanuj

@Abcd i know that , but according to me Carbon with nitrogen should be more stable , as it donates electrons more easily than oxygen

Zhe

@Rick I'm not sure what your point is?

Rick

@Zhe nothing really, just a random thought I got.. :D

Zhe

20:17

@Rick ok :)

Abcd

Q: Confused about carbocation stability

For which element 'X' is the carbocation $\ce{CH3-X-CH2+}$ the most stable? A. X = S B. X = N C. X = O I thought since oxygen is the most electronegative among the options, it would create the greatest electron deficiency, which would in turn facilitate a lone pair donation from the O atom (...

M.A.R.

@Zhe that there are some reactions whose mechanism we don't know for sure

Just a hunch

Zhe

@M.A.R. You are such a troll

I love it

Abcd

You are right @Tanuj, refer to the answer above.

Zhe

@Tanuj Draw the resonance structure? It should be pretty obvious

M.A.R.

20:19

@Zhe no kidding. Sunlight is bad for me

Abcd

@Zhe No idea how drawing resonating structures would help.

Tanuj

@Abcd @Zhe Got it , thanks :)

Zhe

@Abcd $\ce{R2-N-CH2+}$ is an imminium ion

Abcd

@Zhe so?

Zhe

So, you draw out the series

Abcd

20:21

which series?

Zhe

The series with various kinds of X?

The question you posted

And Rick

Tanuj

@Abcd what are you studying these days ?

in maths

JavaScriptCoder

20:52

hi all

M.A.R.

Hi all

JavaScriptCoder

new avatar :)

M.A.R.

Yup. Was about time

I used to change avatars as fast as I did diapers as a baby

JavaScriptCoder

lol

I never change avatars

hBy2Py

21:27

Yeah, @Mart, sorry about you giving me owner status on PT and then basically disappearing. :-/

M.A.R.

@hBy2Py wut, Mart never disappeared

Hey Brian, long time no see

Brain

JavaScriptCoder

21:44

who is Brian?

M.A.R.

@JavaScriptCoder an old timing cool guy

JavaScriptCoder

I see

hBy2Py

22:05

@M.A.R. Oh, whoops...no I basically disappeared.

@JavaScriptCoder Once upon a time I went by my real name on SE

M.A.R.

@hBy2Py no worries . . . Me and Mart can hold the front lines for as long as we breathe

JavaScriptCoder

22:21

@M.A.R. by saying Brian's name whenever he shows up? That counts?

M.A.R.

What? I didn't catch what you said

JavaScriptCoder

you said that you could hold the front lines for @hBy2Py (not revealing his name). Or am I getting this wrong?

pentavalentcarbon

@M.A.R. Sir. SIR.

@M.A.R. I have a doubt, please help

M.A.R.

@pentavalentcarbon you are disingenuous

But not an Indian

So is not working, haha

pentavalentcarbon

@M.A.R. No, I am a pentavalent carbon

M.A.R.

22:31

@JavaScriptCoder hByPy is Brain

pentavalentcarbon

Also you don't know that, have you found my picture?

M.A.R.

Or Brian. Whichever.

@pentavalentcarbon is it on Exorcist movie's poster?

pentavalentcarbon

not sure how you came up with that, but no

I am not so bloody and twisted yet

M.A.R.

Oh, the gentleman killer?

pentavalentcarbon

I don't know, never seen it

Q: What chemical can cause such a fire?

A friend of mine who thinks that she is under influence of black magic met an astrologer. The astrologer asked her to wear a t-shirt for three nights and then bring that to him. The astrologer then cut some lemons and rubbed them throughout the t-shirt. Then he poured some water on her hands and ...

organic-chemistry acid-base

> A friend of mine who thinks that she is under influence of black magic met an astrologer.

oh dear

M.A.R.

22:45

Haha

Shame that I thought the OP was on sciencez side

JavaScriptCoder

oh that question

I saw it

that was... unusual to say the least

pentavalentcarbon

not touching it with a 10 foot pole

JavaScriptCoder

mentions alchemy => not legit

hBy2Py

It ended up a surprisingly decent question, save for falling afoul of the "is there a chemical that..." too-broad VTC rationale.

JavaScriptCoder

we should totally make an alchemy stackexchange

uses scientific method -> not on topic

pentavalentcarbon

22:53

"too broad" is quite abused

hBy2Py

I support "help me expose a charlatan" efforts. Difficult to keep them around at Chem.SE, tho.

@pentavalentcarbon Oh...has that usage of too-broad been rolled back some?

pentavalentcarbon

nope, everything that's not HW gets sent up for too broad

Q: Reaction rate constants for methane combustion

I can't find a rate constant or activation energy for the methane combustion reaction given by: $$\ce{ CH4 + 2O2 -> CO2 + 2H2O}$$ Do all reactions have a rate constant? The NIST web site lists several rate constants for reactions of methane that yield other products, but none for the reaction a...