Question

Can someone tell which are nonpolar and which are polar? I know the bent should be polar.
http://oi65.tinypic.com/abph7s.jpg

Answer 1

@BAdhi

Answer 2

sorry i dont have access to the image

Answer 3

http://oi68.tinypic.com/98wpsp.jpg

Answer 4

Sorry. Maybe it'll work now

Answer 5

Is it opening for you now?

Answer 6

@matt101

Answer 7

Molecules won't be polar because if the partial charges are evenly arranged around the central atom. In a), the two green atoms are pointing at an angle away from one another, so their charges do not cancel (there is a net green "charge" in the direction between the two green atoms), and same goes for the white atoms. That first molecule is therefore going to be polar.

It's for this reason that d) is also polar, as you said - there is a net partial charge of the blue atoms that is not cancelled, and the green atom has its own partial charge different from the blue atoms as well that isn't cancelled.

In b), all the atoms of each colour completely cancel each other's charges. The red atoms are oriented 180 degrees from one another, so whatever partial charge one red atom has is completely canceled by the other red atom whose charge is pointing in the opposite direction. Similarly, the two diagonal paris of greenish atoms cancel each other's charges so that the net charge on the molecule is effectively 0. b) is nonpolar.

c) is clearly a polar molecule - there are three completely different atoms attached to one another, meaning the electronegativity differences between them will generate some sort of polarity.

Does this make sense?

Answer 8

Yes. I wasn't sure if the colors were making a difference with this or not along with the size of the colored atoms.

Answer 9

Thanks!