All Questions
Tagged with inorganic-chemistry organic-chemistry
251
questions
2
votes
1
answer
111
views
Why is the Molar mass of CO2 different than the weight of the sum of its particles?
The Molar mass of CO2 is stated to be 44.009 grams per mol
But in a calculation of the weight of each atom's particles((Electrons,Protons,Neutrons) times Avogadro's constant
I get 44.36 grams per mol
...
- 155
0
votes
1
answer
68
views
Do Electron-Withdrawing-Groups give an hypsochromic shift or a bathochromic one? and why?
I'm not familiar with this topic,but i know that bathochromic shifts occur when the energy gap between energy levels of the substituted molecule, are lower than the unsubstituted one;viceversa ...
- 19
-1
votes
2
answers
226
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What is the chemical reaction between nitric acid and acetic acid?
Is there a chemical reaction between nitric acid and acetic acid?
The main reason I am asking this question because my lab throws away residues of both of these two ($\pu{1 M}$ concentration each) in ...
- 23
0
votes
0
answers
63
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Restriction of back bonding in tris(dimethylamino)borane
J.D. Lee Concise Inorganic Chemistry [3, p. 78] mentions that
The bond length order of the B-N bond in the following compounds is
$\ce{B(NR2)3}$ > $\ce{HB(NR2)2}$ > $\ce{H2B(NR2)}$
and the ...
- 73
1
vote
0
answers
54
views
Confusion in comparing contribution of resonance structures in Hydrazoic acid
Given below is the resonance hybrid of $\ce{HN3}$(Hydrazoic acid)
And these are the resonance structures below:
If the second resonance structure had contributed more, then the two bond lengths ...
- 73
0
votes
0
answers
51
views
Melting Point Order of Benzene Derivatives
Q)Compare the melting points of the following?
o-Hydroxybenzaldehyde
o-Methoxybenzaldehyde
p-Hydroxybenzaldehyde
p-Methoxybenzaldehyde
My attempt: Intermolecular H-bonding increases melting point ...
- 73
0
votes
0
answers
30
views
How does a conc. electrolyte solution extract water from a organic phase like diethyl ether or ethyl acetate?
In organic chemistry, often, during the last steps of a workup we use concentrated brine solution (NaCl) to "extract" the water from the organic layer, especially when we have an organic ...
- 51
3
votes
0
answers
73
views
Why is a C=C weaker than a C=N and even weaker than a C=O when C-C is stronger than C-N and C-O?
Why is a C=C bond weaker than a C=N and even weaker than C=O ? In terms of orbital overlap it doesn't make sense, since there is a difference in energy between the orbitals which lower the interaction ...
- 51
0
votes
0
answers
24
views
How to extract Copper from softgel?
I have an assignment. I need to determine the concentration of copper in a pharmaceutical product using UV-Vis spectroscopy. The product is Chophyll of Healthy America, a softgel that contains: copper ...
- 11
3
votes
1
answer
175
views
Smell of orange peel travels super fast
Many years ago, my college chemistry teacher squeezed an orange peel in the front of the auditorium asking us to raise our hands when we smelled it. Hands rippled through the auditorium (at least 40 ...
- 139
0
votes
0
answers
34
views
Why hyperconjugation is called as σ to π* donation for alkenes and alkynes?
Why hyperconjugation is called as σ to π* donation for alkenes and alkynes if for C2 lowest unoccupied molecular orbital is σ2p not π*2p?
- 33
-1
votes
1
answer
31
views
How do you perform an ion exchange of a monovalent cation with Br- counterion to a divalent or trivalent anion?
I tried to react an organic compound I have synthesized containing a di-N substituted imidazole bromide salt with Ag3PO4 with water at room temp to try to replace the Bromide with PO4(3-). I dont ...
- 137
5
votes
2
answers
371
views
Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test
We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
- 828
-2
votes
3
answers
384
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Structure of AgNO2 and AgONO [closed]
We had a discussion in class today about the substitution reaction of RX with AgNO2 and KNO2. Pretty unimportant, since those seem just fine. But there were 2 arguments.
The root problem was, that we ...
- 41
-1
votes
1
answer
140
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Na+ as an electrophile [closed]
In inorganic I learnt that s block cations are lewis acids but while learning attacking reagents in organic chemistry I came across the fact that Alkali metals are not electrophiles, why so?
- 7