All Questions
45,378
questions
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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 ...
CommunityBot
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-1
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0
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Pump tubing for Sulfuric acid at 130c?
I'm looking for peristaltic pump tubing that is capable of withstanding sulfuric acid at 130 c.
0
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3
answers
683
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Disposal of Silver Halides dissolved in Ammonium Hydroxide
I was reading the Lab Manual for Chemistry prepared by the NCERT . While going through the the test for Chloride ions (pg 88) I came across the following Hazard Warning :
The solution obtained after
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- 29.2k
-2
votes
1
answer
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How can adding a strong base to a weak base be the same as a strong base in solution problem?
In professor's lecture on acid-base titration, professor says (at this point of the video, link should start about the time she says it) adding a strong base to a weak base should be treated as a ...
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0
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No. of Transition States
enter image description here
So in this question I had gotten the answer as 5 Transition states, however the official answer key states it to be 6.
Upon digging further for resources I found a ...
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1
answer
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Why do we only use the principal quantum number to calculate the energy of an electron in an H atom?
According to my high school textbook the energy of an electron in a hydrogen atom is $E = -13.6/n^2~\pu{eV}$, where $n$ is the principal quantum number of the orbital in which the electron is present.
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22
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Struggling to compute the effect of anthropogenic nitrous oxide on atmospheric ozone
I'm trying to compute the effect of anthropogenic nitrous oxide on atmospheric ozone; I have no background in chemistry and thus my calculations are rather simple. Moreover, they seem to be wrong.
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22
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Why pyridine-d5 solvent deshielded chemical shift in proton NMR?
Why pyridine-d5 solvent deshielded chemical shift in proton NMR?
The structure I sent for proton NMR dissolved in pyridine produce almost similar structure as the reference I found. However, this ...
2
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0
answers
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Is the surface electron affinity of (tribasic) sodium- or calcium phosphate higher?
Let's imagine, we have two polycrystalline samples: $\ce{Ca3(PO4)2}$ and $\ce{Na3PO4}$. A free electron is added to both. Some heat is released.
I wanted to check whether my reasoning about this ...
- 256
2
votes
0
answers
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Identifying the rate-determining step from an energy-reaction coordinate diagram
I was wondering how a rate-determining step would be identified for an energy-reaction coordinate diagram. The RDS would be the step with the highest activiation energy, but relative to what? Relative ...
- 415
5
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4
answers
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Unexpected reaction during acid hydrolysis of cellulose
Recently I tried to hydrolyze some cellulose:
I added some acid to it ($\ce{H2SO4}$) then noticed nothing. Even after a few days there was no visible change and after doing some tests for glucose, ...
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Delocalization of Benzene's π-electrons through MO theory
I was just one point away from commenting on the answer in this (Hybrid orbitals forming molecular orbitals) else I would have commented - "So you mean you have two MO theories? The simplistic ...
6
votes
2
answers
285
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Substitute HS Experiment for Synthesis/Decomposition of HgO
In Elements of Chemistry by Antoine Lavoisier, he details a pair of experiments used to determine atmospheric composition:
First, he allowed mercury to simmer in a fixed volume of air over several ...
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0
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How to derive absolute temperature scale from Carnot engine?
This question is about how to obtain an absolute or thermodynamic temperature scale using a Carnot engine.
The reasoning below appears in the book "Heat and Thermodynamics" by Zemansky and ...
- 168
4
votes
1
answer
601
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Differentiating random and ordered sequential mechanisms in enzyme kinetics
Can random and ordered sequential mechanisms be descern by Lineweaver-Burk plot? Why or why not? Because for orederd sequential mechanism I got different LB plot depending on which substrate is held ...
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