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
32
Understanding group theory easily and quickly
Sep 7, 2016
answer
19
Why does bond angle decrease in the order H2O, H2S, H2Se?
Aug 25, 2016
answer
18
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
Is there any empirical upper limit for order of reaction?
Jul 19, 2017
answer
14
Uv vis and fluorescence spectroscopy: sensitivity
Nov 21, 2017
answer
14
Can magnetic fields affect a chemical reaction?
Jul 23, 2016
answer
13
Why is the magnesium(II) ion preferred over other ions in chlorophyll?
Feb 3, 2017
answer
12
Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance?
Jan 29, 2017
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12
Won't the net effect of a catalyst be zero if it creates a new path with lower activation energy?
Sep 11, 2016
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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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