Chemistry
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porphyrin
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I'm a semi-retired physical chemist.

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All Questions Answers
Score Newest
answer
33
Understanding group theory easily and quickly
Sep 7, 2016
answer
20
Why does bond angle decrease in the order H2O, H2S, H2Se?
Aug 25, 2016
answer
19
Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength?
Jul 7, 2017
answer
16
What is resonance, and are resonance structures real?
Jul 31, 2016
answer
14
Where does the energy in coal bonds come from?
Aug 7, 2022
answer
14
Uv vis and fluorescence spectroscopy: sensitivity
Nov 21, 2017
answer
14
Is there any empirical upper limit for order of reaction?
Jul 19, 2017
answer
14
How exactly does UV light break bonds?
Jun 27, 2021
answer
13
Why is the magnesium(II) ion preferred over other ions in chlorophyll?
Feb 3, 2017
answer
13
Can magnetic fields affect a chemical reaction?
Jul 23, 2016
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7
The exact mechanism of energy release durning bond formation on the atomic level
5
Total spin of system of two spin-$1/2$ particles

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