The Periodic Table

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paracresol

17:20

@Cowper sigh

ArtOfCode

→ 86 messages moved to Trash

boom

paracresol

@Art let's just shake on it .-.

ArtOfCode

@paracresol that we can do :)

paracresol

@ArtOfCode Danke

Jan

Let’s sit down and watch the hockey =)

paracresol

17:23

And yeah Jan's a hockey nut^

ArtOfCode

You should come over here, @Jan, one of my housemates did something hockey-related for England for a while

paracresol

@Art So what's your 'parent-site'? O_o

CowperKettle

> 10X concentrate of the sample dilution buffer (Is this a universal, common notation in chemistry: 10X for a ten-fold concentrate?)

paracresol

@ArtOfCode Jan's not going anywhere ( Clings to @Jan ) ;D

ArtOfCode

@paracresol I moderate Open Source and Hardware Recommendations - my chat parent is HR, but I do a lot of things around the network

If there was a generic "all-of-SE" parent site, I'd use it.

paracresol

17:26

1 hour ago, by paracresol

We should put up a bit of the starred comments section from here on the main site...to let new user realise what they're getting themselves into ;P

ArtOfCode

I have an account on all 162 sites

paracresol

1 hour ago, by paracresol

@ArtOfCode I noticed ;P

ArtOfCode

I spend most time on HR just because there's moderation work aplenty to do there.

Jan

@ArtOfCode Where’s here? xD

ArtOfCode

@Jan UK

Jan

17:28

Sounds good, if ortho weren’t home I’ld drop by there, too =D

orthocresol

@Jan Funnily enough, it took me a couple reads to get that. I spend more time in UK than I do back home, so for all intents and purposes the UK is my home ;)

ArtOfCode

waves at @ortho

hey country buddy

Jan

I kinda reject using home for my current location just because it doesn’t feel like home … but then again phrases like going home (from the lab) are too strong ^^'

ArtOfCode

@Jan likewise. I'm at uni, so here doesn't feel like it's home... that's still back in London

orthocresol

I'm not there right now sadly :(

paracresol

17:34

^ Singapore?

ArtOfCode

You can say hi to Journeyman instead :)

We have mods in a lotta places over the world

paracresol

I don't have any racist inclinations, but...has anyone noticed that i'm the only one among the four of us who has a black DP? It's a weird thing to notice...but still... O_O

ArtOfCode

Can't say I had.

Can't say I tend to associate profile images with racism, either, but there ya go :)

paracresol

It's just that on the left side of the page, black is a very striking colour...since everything else is in the white-range ._.

Q: Why is absolute zero unattainable?

We were dealing with the Third Law of Thermodynamics in class, and my teacher mentioned something that we found quite fascinating: It is physically impossible to attain a temperature of zero kelvin (absolute zero). When we pressed him for the rationale behind that, he asked us to take a l...

Still waiting for this to hit 10,000 views :(

@ortho If I feel homework questions like this should be closed, what should I flag it for?

Q: What is the retention time of the respective solute in a chromatographic column?

If the dissociation constant for solute-adsorbent binding is 𝐾𝐷, the retention time of the solute in a chromatography column: (A) increases with increasing 𝐾𝐷 (B) decreases with increasing 𝐾𝐷 (C) passes through minimum with increasing 𝐾𝐷 (D) is independent of 𝐾𝐷

homework analytical-chemistry

1) Should be closed 2) Very low quality 3) In need of moderator intervention ?

@Art, you can pitch in too^

Jan

17:50

Obv Homework ;)

ArtOfCode

@paracresol nah, I don't know Chem so well. Probably not needs mod intervention, is the best I can do

paracresol

@Jan That wasn't an option -_-

I mean, the OP's simply pasted the question there! There doesn't appear to be any effort taken to solve it :/

Neither does the OP mention what's holding him/her back from bring able to solve it ._.

Jan

Should be closed → off-topic → homework.

paracresol

Oh wait...someone's already done it ._.

@Jan Was it you? -_-

Jan

No?

My name would be among the closers.

Also, I’m busy watching Red Bull Munich versus Grizzlys Wolfsburg; the hockey match on the telly.

paracresol

18:08

@Jan I have this feeling that that's not what you're watching 3;D

Oh and by the way

Q: shining river rock with bleach water

I soaked a large jar full of river rock in bleach water for a couple of years and the rocks came out super smooth and shiny when dried. I have tried to repeat this process again but am not having any luck with it this time. Have you ever heard of this and do you know if there is a certain ratio o...

water rocks

Is "river rock" = pebbles ?

Jan

Why would you doubt it? It’s going into overtime now.

paracresol

"Overtime" in the sense?

Jan

Overtime meaning that it was 3:3 after three periods.

paracresol

@$$#*!& You're talking about hockey?! 0_0

Jan

18 mins ago, by Jan

Also, I’m busy watching Red Bull Munich versus Grizzlys Wolfsburg; the hockey match on the telly.

paracresol

18:14

Speechless

Jan

You know, this may come as a surprise to you but oftentimes people mean what they say. Max Frisch wrote an entire drama on the topic: Biedermeier und die Brandstifter

Goal for Munich =3

paracresol

@Jan Brandstifter? O_o

Jan

Actually, it’s Biedermann. Whatever.

The Fire Raisers (play)

The Arsonists (German: Biedermann und die Brandstifter), previously also known in English as The Firebugs or The Fire Raisers (only UK English), was written by Max Frisch in 1953, first as a radio play, then adapted for television and the stage (1958) as a play in six scenes. It was revised in 1960 to include an epilogue. == Plot == This dark comedy is set in a town that is regularly attacked by arsonists. Disguised as door-to-door salesmen (hawkers), they talk their way into people's homes and settle down in the attic, where they set about planning the destruction of the house. The first sketch...

paracresol

._.

4 mins ago, by paracresol

@Jan Brandstifter? O_o

Jan

18:30

Yeah, that’s a word.

MattDMo

19:11

Hi everyone, greetings from Biology! I just have a very quick and simple question: in the lab, are concentrated solutions labeled using the X notation? Meaning, a ten-fold concentrated HCl solution is labeled as 10X HCl. Or, are things just labeled by molarity, and you need to do the calculation yourself to determine if it needs to be diluted 50-fold or whatever?

Also, does this just apply to self-made solutions only, or do kit components from vendors also use it?

In bio and biochem, the X notation is pretty universal, but seeing as I haven't been in a straight chem lab since my undergrad days, I wanted to check.

NotWoodward

19:54

@MattDMo- in a chemistry context I've only ever really seen molarity used, or occasionally %. I.e. 2M HCl or 15% NaOH solutions. The 10x thing doesn't really make a whole lot of sense unless you know what you're measuring it relative to, so I can imagine a biologist might find it useful in a short term sense (i.e. labelling a few beakers with 1x 10x 100x during an experiment), but its pretty useless out of context

Jan

20:36

@NotWoodward The thing is that biologists often want exactly a concentration of x, no matter what the experiment; while chemists will use different concentrations depending on the experiment. So if a biologist has a 10x buffer solution, he knows to add exactly 1/10 of the total volume to the mixture, but that just doesn’t make too much sense in chem.

DSVA

21:34

hey

so I got a little bit of a problem here with some exam questions I went through. maybe someone knows the answers. It's all about aryldiazonium salts and what products you get

1) with Sodium cyanide. I thought only copper cyanide works in a sandmeyer reaction. So what do I get here?

2) Na2SO3 and copper powder. So I know Na2SO3 gives the hydrazine but will copper reduce it to the aniline?

and 3) methanol. The only paper I could find of such a reaction describes several possible products depending on conditions. What could they want here

NotWoodward

They mostly are Cu(I) salts, not necessarily CuCN, since the Cu is involved. But there are a few 'Sandmeyer type' reactions that don't use Cu (less general).

DSVA

Yeah, but afaik you cannot do these reactions with sodium salts. It is believed that copper gets oxidized and reduced in the end. Won't work with sodium

NotWoodward

Sodium I'm not 100% sure of, but there are definitely examples of Sandmeyer type reactions using Potassium salts on very specific substrates

DSVA

Well, I guess they want to have that answer. I don't know where they always find those reactions. Every time they make a new test they've got something which you cannot find in any standard book or online^^