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Polar ve non polar

Posted: Sun Nov 19, 2017 6:24 pm
by 904940852
Is determining if a molecule is polar or non polar just trying to figure out if the overall effect of the charge is equal in all directions, and if so then it it non polar but if not then it's polar?

Re: Polar ve non polar

Posted: Sun Nov 19, 2017 6:27 pm
by Emilie Hoffman 1E
I would say that a molecule whose charges cancel to make an overall charge of zero or one that has no charge to begin with it what we classify as non-polar. A polar molecule is a molecule whose charge is overall in one direction or another.

Re: Polar ve non polar

Posted: Sun Nov 19, 2017 7:58 pm
by StephanieDoan3B
Yes, polar vs. non polar is geometrically unequal vs. equal distribution of negative charge in the atom.

Re: Polar ve non polar

Posted: Sun Nov 19, 2017 8:01 pm
by Paula Dowdell 1F
I would note that you need to first determine if the bonds between the atoms are polar! Some shapes will cause dipoles to cancel out.

Re: Polar ve non polar

Posted: Sun Nov 19, 2017 11:32 pm
by JonathanLam1G
Can someone explain to me why SiO2 is polar? I drew the lews dot structure and came up with a structure very similar to carbon dioxide, which is nonpolar.

Re: Polar ve non polar

Posted: Mon Nov 20, 2017 12:19 pm
by McKenna disc 1C
I'm also having trouble determining whether a molecule is polar or nonpolar-- I realize the directionality of the charges are important, but that's what I have trouble determining. Should I refer to Chapter 3 for help with this? Thanks!

Re: Polar ve non polar  [ENDORSED]

Posted: Mon Nov 20, 2017 12:39 pm
by Sophia Kim 1C
When determining if a compound is polar or nonpolar I would look at the overall charge of the compound so that the dipole moments cancel each other out. Visually you can determine a non polar or polar compound by looking at the symmetry of the lewis structure and if it is symmetrical it is non polar and vise versa.

Re: Polar ve non polar

Posted: Mon Nov 20, 2017 2:43 pm
by Natalie LeRaybaud 1G
Another way to quickly determine whether a molecule is polar or non-polar is to look at the lewis structures. Generally, a non-polar molecule will look completely symmetrical, such as CCl4. The chlorines pull on the carbon in an equal manor with equal bond angles. Other lewis structures which are not symmetrical or have lone pairs are generally polar. For example water (H20) has a lone pair and is a polar molecule even though the oxygens look like they are pulling on the Hydrogen atom equally and symmetrically.