dessyj1
  • dessyj1
What makes a molecule polar, is it simply because of the difference of electro negativities between the atoms or is there more to it?
Chemistry
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schrodinger
  • schrodinger
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aaronq
  • aaronq
A molecule is polar when an electric dipole moment is present, this means a separation of charge - which could be partial charges, like in water, or "full" charges like in an ionic bond.
dessyj1
  • dessyj1
How small does the separation of charge have to be in order to classify the molecule as non-polar?
aaronq
  • aaronq
In terms of electronegativities between atoms, 0.4.

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dessyj1
  • dessyj1
Alright. What if I had something like this |dw:1442183618149:dw| I think this is a alcohol that that is polar. Did I express the partial charges correctly?
dessyj1
  • dessyj1
And last question, how large would the electro-negativity difference have to be in order for a molecule to be polar?
aaronq
  • aaronq
the difference has to be greater than 0.4. And yes, that molecule is polar, the dipole moment is pointed like this|dw:1442184163543:dw| but it's hard to see without the proper stereochemistry and the lone pairs, this is a better depiction (the arrow is coming out of the page)
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dessyj1
  • dessyj1
lol, sorry I did not mean to type polar, I actually meant to type ionic - how large would the diff be for it to be ionic.
aaronq
  • aaronq
i think it's 1.5, hold on
aaronq
  • aaronq
Some websites say different values, this one says <1.7 https://www.chem.wisc.edu/deptfiles/genchem/sstutorial/Text7/Tx71/tx71.html
dessyj1
  • dessyj1
I vaguely remember it to be >1.7 so I'll go with that.
dessyj1
  • dessyj1
Thanks for all your help!
aaronq
  • aaronq
no problem !

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