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

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29 Understanding group theory easily and quickly Sep 7 '16
19 Why does bond angle decrease in the order H2O, H2S, H2Se? Aug 25 '16
18 Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? Jul 7 '17
15 What is resonance, and are resonance structures real? Jul 31 '16
13 Basics of wave-mechanical model of atom Apr 21
13 Is there any empirical upper limit for order of reaction? Jul 19 '17
13 Uv vis and fluorescence spectroscopy: sensitivity Nov 21 '17
13 Can magnetic fields affect a chemical reaction? Jul 23 '16
12 How exactly does UV light break bonds? Jun 27
12 Why is the magnesium(II) ion preferred over other ions in chlorophyll? Feb 3 '17
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