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porphyrin

I'm a semi-retired physical chemist.

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32
Understanding group theory easily and quickly
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19
Why does bond angle decrease in the order H2O, H2S, H2Se?
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18
Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength?
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16
What is resonance, and are resonance structures real?
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14
Is there any empirical upper limit for order of reaction?
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14
Can magnetic fields affect a chemical reaction?
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14
Uv vis and fluorescence spectroscopy: sensitivity
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13
Why is the magnesium(II) ion preferred over other ions in chlorophyll?
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13
Basics of wave-mechanical model of atom
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12
Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance?
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12
How exactly does UV light break bonds?
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12
Pi electron stacking, how does it work?
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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?
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11
Why would a ~1 cm thick layer of argon be a significantly poorer conductor of heat than air?
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11
Differences between formulae for dipole–dipole interaction energy
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11
Terminology of atomic spectroscopy: Difference Among Term, States and Level
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11
the chemical mechanism for deviations from Raoult's law
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11
Does deuterated water slow down the overall metabolism of a cell?
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11
Kinetic energy of molecules in liquid state?
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11
Will entropy increase in adiabatic expansion?
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11
What is the physical basis for Hund's first rule?
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10
Overall effective activation energy for parallel reactions
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10
What is the seventh plane of symmetry in benzene?
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10
Dominant contribution of v = 0 → v = 1 transition in vibrational spectroscopy
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10
Pi molecular orbitals of polyenes
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10
Does an irreversible reaction have an equilbrium between reactants and products?
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10
Why is F2 (fluorine) colourful despite being diamagnetic?
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10
Why is manganese(II) coloured although the transition should be spin-forbidden?
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10
Two reactions which speed each other up
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10
Why is entropy favorable?
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