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1500 questions
22
votes
1 answer
How dependent are computed charges using the quantum theory of atoms in molecules on the used level of theory?
The quantum theory of atoms in molecules is based on the topology of the electron density. This mathematical analysis allows to find critical points and hence has a unambiguous way of separating a molecule into atoms. Each atom can be assigned a…
Martin - マーチン
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22
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2 answers
Is carbonyl-enol tautomerization only intermolecular or can it be intramolecular?
During workup of a conjugate addition reaction, it is likely that protonation occurs at the oxygen of the enolate formed. See discussion here: Do enolates get protonated at the carbon or oxygen atom? In that discussion, it is essentially said "The…
SendersReagent
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22
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What is the meaning of the "-osic" suffix on a metal (e.g., cobaltosic oxide)?
I just came across the term cobaltosic for the first time in the abstract of Ind Eng Chem Res 52(18): 6076, 2013 (emphasis added):
A nanocomposite of cobaltosic oxide and nitrogen-doped graphene ($\ce{Co3O4}$/N-G) was prepared by the facile…
hBy2Py
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22
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2 answers
Does resorcinol give positive iodoform test?
It's given in my book that other than the usual compounds that answer iodoform test, resorcinol (benzene-1,3-diol) also gives positive iodoform test.
Is this because of tautomerization which gives a diketone with an active methylene group? But why…
user23939
22
votes
2 answers
Usage of ammine vs amine in nomenclature
In the nomenclature of complex salts we use ammine for NH3 instead of amine.
I thought this was to differentiate between ammine ligand and amine in organic ligand (like en).
However, Wikipedia cites the usage has historical reasons. So why exactly…
Freddy
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22
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4 answers
Why do Organolithium or Grignard reagents act as nucleophiles and not as bases with aldehydes and ketones
I've read entire Chapter 14: Organometallic Compounds of Francis Carey's "Organic Chemistry" but I still didn't get an answer to my question.
Quote from the book:
Because of their basicity organolithium compounds and Grignard reagents cannot be…
claws
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22
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1 answer
Is the Springborg 6D phase space model used in modern molecular orbital modeling?
In various papers written in the 1980s, Michael Springborg explored an interpretation of the Wigner phase space function as an electron density in a six-dimensional $(q,p)$ phase space. He applied it with some success to several simple compounds.
Is…
Terry Bollinger
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2 answers
Why must both the critical temperature and pressure be exceeded to achieve the supercritical phase?
The characteristics and properties of supercritical fluids and the associated vapor-liquid critical point are well established. One thing that I've always been curious about, though: what is the physical explanation for why it's necessary for both…
hBy2Py
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22
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1 answer
Why is the bond order of CO+ 3.5?
According to my books the bond order of $\ce{CO+}$ is $3.5$. But shouldn't it be $2.5$? On googling this, I found the following answer that is on Stack Exchange but its only talks about the bond length.
I am unable to understand why it is $3.5$ as…
Chloritone_360
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How can 32 g of Gatorade powder contain 33 g of carbohydrates?
A screenshot of the nutrition facts of a can of Gatorade powder was posted on my Facebook feed:
The label reads "Per 32 g (about 3 tbsp)", but if you read through the ingredients, the amount of carbohydrates listed exceed that of the serving size…
yuritsuki
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22
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2 answers
What is the favoured geometry of chlorine trifluoride?
Why is the first structure on the left more stable than the second one on the right?
In the first one the angle between the two pair of nonbonding electrons is about 120° which is a lot less than that in the second structure. And it is also very…
Abhirikshma
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22
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1 answer
Could milk rust a steel teaspoon?
Recently, while cleaning a neighbour's fridge (turned off for a few weeks), I came across a cup (closed with a lid). Inside the cup was, to my olfactory horror, congealed milk, with a steel (iron) teaspoon nicely wedged into it.
The milk had…
user15489
22
votes
1 answer
Why are hydrogen ions always associated with another molecule?
I was reading N.C.E.R.T. class XI part 2 book and chapter Hydrogen,when I came across this statement:
Loss of the electron from hydrogen atom
results in nucleus ($\ce{H+}$) of ~1.510–3 pm size.
This is extremely small as compared to normal
…
Kartik Watwani
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22
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3 answers
Why are Group 11 elements unreactive?
Group 11 metals namely $\ce{Cu, Ag, Au}$ are known for their low reactivities. They are thus rightly called coinage metals and have been historically used to make currency owing to this very property of theirs. My question is, what is the reason…
Gerard
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2 answers
Clemmensen reduction vs. Wolff-Kishner reduction
In which cases is the Clemmensen reduction is preferred over the Wolff-Kishner reduction?
One thing is that the Clemmensen reduction is done under acidic conditions whereas the Wolff-Kishner reaction is done under basic condition, and that I think…
user14874