The Periodic Table

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Loong

05:40

So basically the "smallest sum of locants" again?! — Martin - マーチン ♦ 39 mins ago

flagged

1 hour later…

Mockingbird

06:56

I am just interested about the production of (RS)-N-methyl-1-phenylpropane-2-amine

Commonly known as Meth. (Don't think I want make it really :p)

Suppose, I have 1-phenylpropane. How to introduce the N-methyl group on the second carbon? Would treating it with methanamine do?

3 hours later…

pH13 - Yet another Philipp

09:55

ABcDexter

10:35

Hi everyone

ABcDexter

10:58

Does anyone know about Cheminformatics?

NotEvans.

@ABcDexter Its quite a broad topic, anything specifically?

Bounty Hunter

11:24

Q: What is the nature of the Fe–O2 binding in oxymyoglobin and oxyhemoglobin?

Deoxymyoglobin ($\ce{Mb}$) is known to have iron in the +2 oxidation state; I believe this was deduced from its magnetic moment, which corresponds to four unpaired electrons in high-spin $\mathrm{d^6}$ Fe(II). However, upon binding of $\ce{O2}$ (which is itself paramagnetic) to Mb, the resultant...

CowperKettle

11:40

If my Russian text says about the volume of solution to be used in a chromatography operation: "from x8 to x10 volume", would that be understood? Or should it really be "8x to 10x volume"?

The meaning is, between 8 full column volumes and 10 full column volumes of the solution should be passed through the column in that particular operation.

1 hour later…

Pritt Balagopal

12:44

Q: How to prepare a water sample for photometry

The purpose of measuring N P K Ca Mg S is to determine the amount of material consumed by different types of plants in different periods. The initial solution, which is prepared as a nutritious solution, includes highly accurate and measured doses of substances such as Potassium Nitrate, Magnesiu...

water spectrophotometry

This was flagged as unclear, and I skipped review since I can't judge. Can anyone help him out?

2 hours later…

DSVA

15:05

oh god it's way too hot here. Even our supercomputer gave up .-/

M.A.R.

15:18

@DSVA nice excuse.

Don't break supercomputers!

DSVA

:-P

nope really, some switches failed. already got 95 messages of failed jobs that's going to be fun tomorrow:-S

M.A.R.

And if tomorrow's hotter than today?

DSVA

It might be (I hope not, 37°C is already enough), but they said they will fix the cooling. I hope they succeed.

M.A.R.

15:34

@DSVA tell them to use the supercomputer to power the cooler so it gets hotter and you get time to chat

Zhe

Huh. I got a +2 to my rep because a user was removed.

I guess that makes sense

M.A.R.

@Zhe try figuring out +31

Zhe

¯\_(ツ)_/¯

I am now at an even 7600 though

Got a ways to go before I become ron though

M.A.R.

We could dig up what happened, but I'm too lazy for that

Zhe

I'm not sure we care :)

2 hours later…

Melanie Shebel

17:25

Anyone want to edit all these answers?

Q: Why is SiO2 solid while CO2 is a gas?

I was under the impression that chemistry almost exclusively involves valence electrons because there isn't enough energy to strip off electrons located closer to the nucleus. If that is true, and elements in the same period have similar properties because they have the same number of valence e...