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

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Top Posts (513) All Questions Answers | Votes Newest

21 Understanding group theory easily and quickly Sep 7 '16
16 Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? Jul 7 '17
13 Why does bond angle decrease in the order H2O, H2S, H2Se? Aug 25 '16
13 Is there any empirical upper limit for order of reaction? Jul 19 '17
12 Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance? Jan 29 '17
11 Why would a ~1 cm thick layer of argon be a significantly poorer conductor of heat than air? Jul 31 '18
11 What is resonance, and are resonance structures real? Jul 31 '16
11 Uv vis and fluorescence spectroscopy: sensitivity Nov 21 '17
11 Does deuterated water slow down the overall metabolism of a cell? Jul 23 '17
11 Won't the net effect of a catalyst be zero if it creates a new path with lower activation energy? Sep 11 '16
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