All Questions
45,432
questions
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1
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18
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Why zero-overlap approximation is used for explaning the relation between the ΔE(AO) and the effectiveness of resulted MO?
In Atkins' physical chemistry 10e, page 424, eq 10D.8c, zero overlap approximation is used to obtain an expression for the energies for the molecular orbitals. I could not understand why zero overlap ...
- 219
-1
votes
1
answer
34
views
Understanding (PuCl6)2-
So $\ce{[PuCl6]^2-}$ is an anion comprised of $\ce{Pu^4+}$ and $\ce{Cl-}$, and $\ce{Cl-}$’s 3 p orbitals and $\ce{Pu^4+}$’s d2sp3 hybrid orbitals bond.
And the d2sp3 hybrid orbital of $\ce{Pu^4+}$ is ...
- 7
-2
votes
0
answers
13
views
How do vacant orbitals take place in hybridization? [closed]
How do vacant orbitals take place in hybridization? Do other electrons of other atoms fill them up or are they left as they are.
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votes
2
answers
31
views
Problem in finding relation between molarity and weight by weight percentage
While finding the relation I did the following steps:-
$\frac WW$% $= \frac{W_{solute}}{W_{solution}}\times100$ $.......(eq^n 1)$
(where both masses are in grams)
Since weight of solution can be ...
1
vote
0
answers
18
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Reason for 19F NMR of OsO2F3 chemical shift
I have been learning that [OsO2F3]+ shows two signals on the 19F-NMR spectrum. There is a doublet and a triplet which accurately depicts that there are two axial fluorine and an equatorial fluorine ...
- 620
0
votes
0
answers
19
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Bromination with NBS and AIBN
I reacted 3-pyridylacetic acid (6 fluoro) with NBS and AIBN in CCl4. I refluxed the reaction mixture for 4 hours at 80 degrees. No reaction occurred, and the starting material remained (based on TLC ...
- 47
0
votes
1
answer
66
views
Mass conservation in chemical equilibria
Please help me understand this, it's really confusing me!
So suppose we have an equilibrium $\ce{A <=> B}$, and that we have initial masses $m_{\text{A}}$ and $m_{\text{B}}$ of the substances. ...
- 19
1
vote
1
answer
35
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Identifying optically active alcohols
The correct option is D only.
I am having a confusion with option B and C. The compound in option B reacts with Grignard to form this
There's only one chiral carbon and thus must be optically active. ...
- 129
-1
votes
0
answers
22
views
What happens to the activation energy in an exothermic reaction? [closed]
I understand that in an energy chart for an exothermic reaction, the "energy released" is the step down in energy from the reactants to the products. But what happens to the activation ...
- 99
1
vote
0
answers
36
views
Finding porosity using Ideal gas law
A 1 $cm^3$ sample or reservoir rock is put in a chamber of 10 $cm^3$, where the total pressure is 750 $mmHg$. This chamber is closed, and a valve is opened such that the air can expand to another ...
- 21
-1
votes
1
answer
30
views
Why is it so that higher the magnitude of activation energy, stronger the temperature dependence of rate constant? [closed]
Why does a higher activation energy lead to a stronger dependence of rate constant on temperature?
- 19
0
votes
0
answers
25
views
Will CO2 dissolved in water change the tds reading of the water?
I have filtered water reading between 0 and 4 ppm on a tds meter. I add CO2 using a soda stream. The water reads 27-34 ppm after adding CO2.
Is the change in tds readings due to the CO2 or due to ...
- 267
0
votes
0
answers
21
views
Why Car Parrinello Molecular Dynamics doesn't need an SCF calculation at every time-step?
Reading the various terms of the Lagrangian in CP-MD I'm trying to understand why there is not an SCF procedure hidden there.
In fact, it seems to me like the second term of the Eulero-Lagrange ...
- 101
-1
votes
0
answers
33
views
why does sp mixing occur in smaller elements?
So I just started learning MO theory. I'm aware of a difference in the MO energy diagrams for elements smaller than n=14.
The sources I refer all point to s-p mixing in the smaller elements which ...
-1
votes
0
answers
27
views
How can oxygen make a coordinate bond in O3 without vacant orbital
I was taught that for the formation of a coordinate bond the first condition is that the donor atom must have a lone pair of electron and second condition is that the acceptor must have a vacant ...
- 1