The Periodic Table

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CopperKettle

4:03 AM

@Jan Thank you!

3 hours later…

Martin - マーチン

7:14 AM

@ⱮᏁℛ Well... that confirms my suspicion :(

4 hours later…

ⱮᏁℛ

11:28 AM

@Kurzd A kinda cool-looking A.

I can see it on desktop, Win8, so it must not be something that far-fetched. :P

ⱮᏁℛ

12:21 PM

in Mathematics, yesterday, by Akiva Weinberger

"Pigeonhole principle: When you have $n$ pigeons and $n+1$ holes, there is at least one pigeon with two holes in it."

Wow +1

CopperKettle

1:00 PM

Poor one-hole pigeons.

Or is it "unihole pigeons"?

CopperKettle

1:36 PM

> Explain the binding properties of Ca(OH)2. Why is this chemical used in the construction industry and how? Provide a reaction equation.

(from a textbook)

The answer is Ca(OH)2+CO2 >> CaCO3 + H2O

But how does that relate to the construction industry?

Is there a need to bind CO2 during construction? (0:

4 hours later…

CopperKettle

5:55 PM

I wonder what Fe(OH)3 really is. The oxide FeO with the OH group just lying by? Or are they somehow attached..

1 hour later…

ⱮᏁℛ

6:56 PM

@CopperKettle uniholigons

ⱮᏁℛ

7:06 PM

@CopperKettle It's one Fe 3+ and three hydroxides.

@CopperKettle No, but industry loves CaCO3.

CopperKettle

Iron(III) oxide-hydroxide

A number of chemicals are dubbed iron(III) oxide-hydroxide. These chemicals are oxide-hydroxides of iron, and may occur in anhydrous (FeO(OH)) or hydrated (FeO(OH)·nH2O) forms. The monohydrate (FeO(OH)·H2O) might otherwise be described as iron(III) hydroxide (Fe(OH)3), and is also known as hydrated iron oxide or yellow iron oxide. == Natural occurrences == Iron(III) oxide-hydroxide occurs naturally as four minerals, the polymorphs denoted by the Greek letters α, β, γ and δ: Goethite, α-FeO(OH), has been used as a pigment since prehistoric times. Akaganéite is the β polymorph, formed by weathering...

It must be something more complex than just Fe with the charge 3+ and three hydroxides..

ⱮᏁℛ

@CopperKettle There's no it. There's them.

You're trying to fit different compounds in one beaker. Bad practice man, BAD PRACTICE

CopperKettle

I just don't understand this FeO(OH)

what connects to what

Maybe I just nead to read the textbook and leave this issue for a while.

ⱮᏁℛ

@CopperKettle Hmm, lemme think

It could be Fe (III) + O, so it has a +1 charge.

CopperKettle

7:23 PM

Do you mean the whole [FeO] has a +1 charge?

ⱮᏁℛ

Yes.

CopperKettle

because [FeO] drew an electron off the OH group?

Ah, no.

The other way around.

ⱮᏁℛ

@CopperKettle Depends on how you want to interpret it.

International negotiations don't go on atomic scale.

CopperKettle

The OH group attracted an electron from FeO, and because of that FeO is an ion with a charge of +1.

ⱮᏁℛ

Nothing "wants" anything, nothing "demands" or "needs" it. We're only playing with words because it's impossible to get the explanations right without them.

CopperKettle

7:29 PM

I know.

ⱮᏁℛ

So I rather say hydroxide stole something. I like crime stories.

CopperKettle

Okay. Fe has an oxidation state +3. Two electrons are used up in the linkage with O, and one is drawn all the way to OH.

Two electrons are slightly closer to O, and one is closer to OH.

ⱮᏁℛ

@Loong you there?

Loong

@ⱮᏁℛ ?

ⱮᏁℛ

@Loong Should "pH" be upright?

Loong

7:32 PM

@ⱮᏁℛ yes

ⱮᏁℛ

Sends a "thanks" letter to IUPAC

Mithoron

@CopperKettle Geez, why you're even thinking about it as a beginner? It's complicated coordination polymer where O and OH are bridging ligands binding Fe together

ⱮᏁℛ

@Mithoron The most curious learner always gets the most frowns. :)

I wish everyone in the world had his spirit.

We wouldn't have had more than 1000 questions on chem though. :P

Mithoron

@ⱮᏁℛ Why?