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4:16 AM
@Mithoron thank you
> $H_2S + 2FeCl_3 → 2FeCl_2 + S + 2HCl$
How is this possible?
Sulfur is much more electronegative than iron
Why does sulfur allow iron to grab more electrons?
 
4:30 AM
I asked this on Socratic, because it might be too stupid a question for Chem SE
 
 
2 hours later…
6:35 AM
Can we obtain H2S from CuS in any way?
I cannot find how
Dilute CuS in concentrated HNO3 first?
And what next?
 
7:06 AM
Why can hydrogen reduce iron from oxides? Hydrogen is to the right of iron in the activity series - thus iron gives away electrons more easily
 
 
1 hour later…
8:27 AM
Hello, is anyone on?
 
 
1 hour later…
9:42 AM
@PrittBalagopal Am now
 
10:26 AM
$Cu(OH)$ + $H_2CO$
How do we know that formaldehyde is oxidized by Cu(OH)?
I can see that Copper's oxidation went from +1 to zero
But how do I look for formaldehyde's oxidation?
 
@CowperKettle look for C's OS
 
@M.A.R. thank you, I shall try now
 
@CowperKettle thou shalt usually only look at the OS of the central atom
 
Thus Spake Zarathustra
 
Hello StackExchangers
 
10:35 AM
@PrittBalagopal \o
 
Looks at this newbie question. This dude can't even open wikipedia.
 
@M.A.R. If I consider that a link with Oxygen makes Carbon gain +1 of oxidation, and that a link with Hydrogen makes Carbon gain -1 of oxidation, then in methanal the Carbon has the OS zero, and in formic acid it has +2
 
@CowperKettle I guess thats right.
 
@PrittBalagopal Thank you
Dhanyavaad
 
@CowperKettle I guess that means 'Thanks' so Youre Welcome!
I dont know much Hindi lol.
 
10:39 AM
Ah! Sorry (0:
I wonder if there's an explanation of why formaldehyde turns into formic acid upon reaction with Cu(OH)2
I mean, the mechanism
 
@CowperKettle Oxidation reactions usually have complicated mechanisms, but I might have one.
 
Mechanisms usually confuse, not explain
 
Where is that question?
@M.A.R. Maybe some mechanisms, but I'm good at explaining!
 
Okay, I'll ask the question
 
0
Q: How do we know which compounds have higher solubility?

ThemysteryOflifeIs there any way we can look at the chemical formula of various compounds, do some calculations or something and figure out which compounds will have higher solubility as compared to the others.

Is this question too broad or possible to answer?
 
10:43 AM
@PrittBalagopal way too broad
Of course, if you have a really good answer to provide, I'm not gonna stop you
It's all about answers
 
Nahh, It'd take ages to get enough data to answer that right?
 
Yeah
 
>Upon reaction with copper hydroxide, formaldehyde turns into formic acid:

> $\ce{HCHO + Cu(OH)2 -> HCOOH + Cu + H2O}$

>I wonder if there's a simplified explanation of how exactly this happens. I want to remember this reaction, so it would be helpful to understand it.
I think such a question would be downvoted.
No effort made.
 
Use the word "mechanism"
And explain what you already know
 
I know nothing
 
10:53 AM
@CowperKettle This is the mechanism I thought of i.stack.imgur.com/mUrWy.png
 
Mechanism of a classic redox reaction should be the title
 
Im not sure if its correct. I assumed oxidizing agent supplies the radical.
 
@Is it me or does anyone find it to be "too tiring" to read all that stuff?
@CowperKettle
 
Feeling drowsy
@PrittBalagopal Everyone gets a headache reading documentation
 
@CowperKettle I think it's too tough for Socratic's people. :P
@PrittBalagopal I close my eyes as soon as it gets to "Methodology"
First figure, and I'm already napping
I wake up in the references
 
@CowperKettle Apparently MathJax doesnt work on Socratic
I dont have an account on socratic though.
 
@PrittBalagopal They do have a way of displaying equations though
I forgot
Maybe they render stuff as images?
Some sites do that
 
Hmm
12
Q: Functional difference of Benedict's solution and Fehling's solution

busukxuanChemically, Benedict's solution and Fehling's solution are very similar, with copper sulfate as a source of copper (II) ions, sodium carbonate and sodium hydroxide respectively as alkalis, and sodium citrate and sodium potassium tartarate respectively as chelators. They are also both used to test...

This one looks interesting.
Also has a bounty on it.
 
If you can answer, bounties are a good boost
 
11:12 AM
I can't :(.
But the question definitely deserves an answer.
 
 
2 hours later…
12:47 PM
About 70 people have just been arrested in St. Petersburg for taking part in a peaceful demonstration
The demonstration lasted the whole of 15 minutes
 
2
A: Mechanism for the Cleavage of Diborane?

Berry Holmes Is it known how this cleavage occurs? The mechanism proposed for the cleavage reaction involves an initial attack by the donor on one boron atom in diborane, leading to cleavage of one $\ce{B-H-B}$ bridge. This is followed by the attack of a second donor molecule, cleaving the remaining $...

I answered this question yesterday and I want to answer a similar question today:
10
Q: Why is diborane cleaved symmetrically by trimethylamine but unsymmetrically by ammonia?

RobChemI know that soft bases cleave diborane symmetrically but hard ones don't. However, what makes ammonia harder than trimethylamine? And why does hardness/softness affect this?

However the problem with this question is that imo it doesn't have a definitive answer. It's more like we have our observations first and then a plausible deduction.
 
1:38 PM
This is from Chemguide
Why does the chloride ion contain only 3 lone pairs? It surely has 4 lone pairs
 
 
2 hours later…
3:18 PM
What constitutes metallic character?
Is it electronegativity only?
 
And being a metal
These terms are vaguely and loosely defined and used
And in the places where they shouldn't be vaguely defined, the researchers usually provide their own strict, localized definition
What's your real question @Cowp?
 
The question was to range Group 15 elements in the order of decreasing of their metallic character
Easy-peasy
As, P, N
 
Well, yeah
 
Because as we go up the group, electronegativity increases, and hence the non-metallic character
 
Such questions only require you to know the electronegativity trends
@CowperKettle Yeah
 
3:24 PM
By the way, there's an outstanding old movie titled Karakter
 
Metallic character can also be a property of a bond
Fancier use of the word
 
Character (Dutch: Karakter) is a 1997 Dutch-Belgian film, based on the best-selling novel by Ferdinand Bordewijk and directed by Mike van Diem. The film won the Academy Award for Best Foreign Language Film at the 70th Academy Awards. The film stars Fedja van Huêt, Jan Decleir, and Betty Schuurman. == Plot == In the Netherlands of the 1920s, Dreverhaven (Decleir), a dreaded bailiff, is found dead, with a knife sticking out of his stomach. The obvious suspect is Jacob Willem Katadreuffe (Van Huêt), an ambitious young lawyer who worked his way up from poverty, always managing to overcome Dreverhaven...
 
Golly
7.8 on IMDB
Nice
 
It once came across it on the TV, and it's just a masterpiece
Too bad they discarded forums on IMDB
Forums were a good way to understand if the movie is good or bad
Just by scanning the titles of the threads, without going inside
Why can't Ca give away just one of its outer shell electrons?
 
3:49 PM
Covalent nonpolar bond.
I think it's in C2H6 and in N2
All the others seem to have polar covalent or ionic bonds
Thus far I have spent 30 hours on recalling chemistry
And I feel that I need maybe 120 hours more to start to feel confident
 
Hello!
 
 
1 hour later…
5:11 PM
@PrittBalagopal Hey there!
 
5:21 PM
3
Q: Why can enolizable aldehydes undergo Cannizzaro reactions?

Utkarsh GuptaWhy does 2-methylpropanal undergo a Cannizzaro reaction even though it has an $\alpha$-hydrogen?

 
Why does hot, concentrated H2SO4 react with Cu?
Okay. Cu is less willing to give away electrons than H
But all of a sudden it gives away its electrons to H+
Why?
 
6:23 PM
5
Q: What causes the "Gd break" in the trend of lanthanide-EDTA formation constants?

orthocresolSmith and Martell obtained a series of data for the binding of trivalent lanthanide ions, $\ce{Ln^3+}$, with various carboxylic acid ligands (amongst them the well-known EDTA).1 A graph of the formation constants is attached ($K_\mathrm{f} = [\ce{Ln(edta)-}]/[\ce{Ln^3+}][\ce{edta^4-}]$): Due t...

 
6:49 PM
Argh
Don't VTC stuff
Dammit
Don't VTC as homework
DON'T
@Loong @orthocresol I'd appreciate it if mods help leaving stuff that shouldn't be closed open
Obviously, the VTC community is off the track
-1
Q: Is it possible to prepare a solution of hydrogen sulfate in a lab? What is the procedure to do so?

Bob OlieI don't want a buffer solution with it, I want to know if its possible to have a solution with only $\ce{HSO4^{-}}$ ions in it.

Not closable, but has VTC
0
Q: Need help with Chemical Formulas with EGR

DakinThis regarding an Mechanical Engineering Exam Example Question, I'm rather stuck on where I'm going, but here goes: So I have a combustion engine that features exhaust gas re-circulation, basically the exhaust gases are fed back into the intake, with the equivalence ratio of 1. Using octane gas ...

Too broad, not OT
Even multiple related questions are okay
So unclosable
-2
Q: What does "heat is evolved at standard-state conditions" mean?

Mr. ChameleonI have a chemistry homework problem: When 0.539 g of Na(s) reacts with excess F2(g) to form NaF(s), 13.3 kJ of heat is evolved at standard-state conditions. What is the standard enthalpy of formation (ΔH°f) of NaF(s)? I am not asking for the answer. What I would like to know is what "1...

They're not asking for the answer. It's basic erratum.
Unclosable, but has VTCs as homework
-1
Q: Stability of compounds

saladiWhich is more more stable, cis-1-ethyl-3-methylcyclohexane or trans-1-ethyl-methylcyclohexane? I think trans- is more stable than cis- but in my textbook the answer is different.

4 VTCs, no comment that they should edit, and the OP has given the answer, just not the reasoning
 
well, that last one, I would definitely have VTC'd
if my vote was not binding
 
@orthocresol There is a little effort, which is different from no effort
 
no, there is no effort
no thoughts on the topic
 
If the effort isn't enough, we should ideally link to the effort policies and related meta posts
 
no nothing
Whats 2+2? I think its 100000, but the answer says 4.
 
6:59 PM
No reasoning, but there's a proposed answer
 
Not hard to do when there are only two possible answers
I'm not sympathetic towards that one.
Anyway, in general, I think people need to use downvote more, close vote less.
 
There are no comments for the VTCs
No one asking for more reasoning
 
That's another issue altogether.
 
If we're not asking them to tell us more, why would we expect them to read our minds?
@orthocresol The point is, we're just closing and moving on
We shouldn't just be closing and moving on
 
and the yellow box of closure, supposedly, has enough guidance
 
7:01 PM
Providing they read it
 
If they don't, that's not really my problem.
 
I'm ready to bet people read comments much more than automagically appearing close banners
 
yes, they probably do
well, let's talk about this another time, i'm not in a great mood and inclined to help them
 
K
Just saying
 
In principle I agree that there can definitely be more guidance
and I entirely agree that the HW CV is being misused
 
7:03 PM
Apparently my overzealous closure meta didn't garner the discussion I wanted
 
it's a little slow
i haven't been around much
 
I would like to participate in that discussion as well
 
I just felt that this was related: chemistry.meta.stackexchange.com/questions/3166/…
There are lots of bad questions which I downvote. I dont like them, but i can't really close them.
however, when you are just 1 of 5, then it's easy to drop a CV and think "if people agree, then its fine"
i could write a meta post on that, if it helps
however, you will always have people who will insist on VTCing
Todd's answer is a good insight into what they are thinking:
> For the more general query involving overzealous closure as homework, well, if there was another choice like "not enough effort shown by OP", I'd click that button. But we don't have one, so I go with homework in cases such as this.
 
@orthocresol Indeed, but close votes aren't downvotes
 
Of course.
 
7:08 PM
@BerryHolmes Sure
 
ugh, that AlCl3 question, which can be solved by looking up the Wikipedia article, gets 3 answers
 
Actually i wanted to say like for example there's seasoned advice, i read it once on a meta post, the community was very welcoming, like they edited the questions even if they were horrible, and were lenient even with the off topic questions and today i'm impressed with the stats
 
@orthocresol The site will not always get awesome posts
Part of the traffic comes from those clickbait crappy answers
The less stuff we close and answer, the less harsh we'd seem
Harshness is necessary, but also . . . salty
 
maybe we should simply abolish the HW close reason
 
@BerryHolmes Seasoned Advice is more seasoned than our site
 
7:12 PM
lol
 
Chem is a little baby, learning to walk
 
Lol
Indeed, simple questions get more views then complex question, like for in Bio.SE
29
Q: What do butterflies eat?

Yves LaFayetteI found a beautiful scarce-swallowtail butterfly in my storeroom, but it was kind of frozen and couldn't fly away. So, I put it on my terrace in the sun. After a little bit, it flew a few meters away and fell. I was wondering what could these beings eat, so that I can help it... Any answers would...

Over 5k views
 
@BerryHolmes I had this discussion with someone from here a while ago
Lemme find it
 
i think fundamentally the issue is still with the close reason, it is too unspecific, and leaves a lot of room for interpretation
it's easy to justify closure with "I think it's not enough effort" when "not enough" is not well-defined.
the answers to your last meta post, and my last meta post, show that some people's lines are clearly different from yours and mine
 
Apr 4 at 16:05, by M.A.R.
@Pranav This being votes indicating popularity over quality? That has always been annoying. Not bad per se, and votes never needed to be about quality in the first place.
 
7:23 PM
if I am going to write something telling people when to close and when to downvote, then I would have to tell them very clearly where the line is
 
@N
 
Oops i meant @M.A.R. and that's very true for meta-posts, you don't agree with it? Downvote it.
Even if it's a relevant answer.
 
Downvotes on meta can be for a million reasons
 
But wait, if we just comment on the question that if you don't provide more context the question will be closed as HW and still the OP didn't make an edit and the question gets an answer anyway?
 
7:31 PM
@BerryHolmes If the answer is good, upvote and VTC anyway
If it's bad, one more helpful flag
 
Our main aim when we're VTCing a question to close is to not do the homework for the OP but now, since he has the answer, closing it afterwards will do no good
 
well, not really
i don't care whether OP gets their answer
it's not my job to dictate how they learn chemistry
 
@BerryHolmes Our main aim for VTC'ing is not allowing the question to get a bad answer
 
Oh I see
 
@M.A.R. funnily enough, if people used their votes, this would not even be an issue
just downvote both the Q and the A to oblivion
 
7:44 PM
A bit off-topic: Do you all ever use SE on your smartphones?
 
 
1 hour later…
9:08 PM
So...xkcd says that gaseous oxygen is very barely blue, and that's why distant objects appear bluer. Is there any validity to that?
 

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