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O2    
Chromophore \Chro"mo*phore\, n. [Gr. ? color fe`rein to bear.]
(Chem.)
Any chemical group or residue (as {NO2}; {N2}; or {O2}) which
imparts some decided color to the compound of which it is an
ingredient.
[1913 Webster]


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  • What is the difference between O O2 - Chemistry Stack Exchange
    So, to reiterate, the difference between oxygen $\left (\ce O\right)$ and oxygen $\left (\ce {O2}\right)$ is that the former is an oxygen atom while the latter consists of two $\ce O$ atoms bound together, forming a molecule also called oxygen
  • Whats the difference between 2O and O2 [duplicate]
    I just saw something in a chemistry lesson what got me confused What is the difference between $\\ce{2O}$ and $\\ce{O2}$? Thanks for the help!
  • orbitals - What is the origin of the differences between the MO schemes . . .
    S-p mixing is the primary cause of the difference in the molecular orbitals of nitrogen and oxygen, which is influenced by the initial atomic orbital energies The lighter second period elements (prior to oxygen) have a relatively small difference in energy between the 2s and 2p orbitals This allows sufficient s-p mixing to lower the energy of the σ (2s) and σ* (2s) molecular orbitals, and
  • Why do we call O2 oxygen? - Chemistry Stack Exchange
    Likewise $\ce {O2}$ is as much oxygen as atomic oxygen is The only complication is that what we habitually think of as oxygen is oxygen as a gas comprised of $\ce {O2}$ molecules Like Humpty Dumpty in Alice in Wonderland, "a word means what [we] choose it to mean" and often we have to add modifiers or alternate terms to avoid ambiguity
  • Why is oxygen paramagnetic? - Chemistry Stack Exchange
    Paramagnetic molecules are molecules that have single electrons When I draw the lewis structure of $\\ce{O2}$, it appears to be a diamagnetic structure What makes it paramagnetic?
  • What is the LUMO and HOMO in and O2 diatomic
    In the typical way these terms are used, the LUMO can't be the same as the HOMO Since each of the pi spatial orbitals already have one electron, they are not unoccupied, so they can't be the LUMO In the sense of singly occupied spin orbitals, you could say that these pi spin orbitals are the LUMO, but its fairly nonstandard to refer to spin orbitals when discussing HOMO LUMO
  • stability - Why is O2 a biradical? - Chemistry Stack Exchange
    And finally there is $\ce {O#O}$ where both oxygens are positively charged and are free radicals Why are both positively charged? It is because 3 bonds already to oxygen means 1 lone pair and 5 electrons around oxygen is +1 Is it because of these resonance structures giving 2 free radicals in $\ce {O2}$ that $\ce {O2}$ is considered a biradical?
  • redox - Half equations for H2O2 for its reducing and oxidising nature . . .
    Is there a complete list of all the half equations for $\\ce{H2O2}$ - both oxidation and reduction, in acidic and alkaline conditions? I've looked on the internet but can't seem to find a list with
  • Why does N₂ react with O₂ to Form NO at high temperatures?
    In Earth's atmosphere, the NO formed by lightning, reacts with O2 to form NO2, which then forms HNO3 So in our environment, no NO does not return to N2 and O2, because it reacts with more O2 before that can happen
  • Does O2 have a color in the gas phase - Chemistry Stack Exchange
    Background $\ce {O2}$ exists as a paramagnetic, triplet since the two electrons in its two (degenerate) HOMO orbitals are unpaired There are 6 known phases of solid oxygen with color ranging from pale blue to red to black In the liquid phase it has a light blue color This color is due to light absorption by the ground state triplet according to the following equation $$\ce {2 O2 (^3\Sigma





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