Polar ve non polar  [ENDORSED]

(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

904940852
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

Polar ve non polar

Postby 904940852 » Sun Nov 19, 2017 6:24 pm

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?

Emilie Hoffman 1E
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Polar ve non polar

Postby Emilie Hoffman 1E » Sun Nov 19, 2017 6:27 pm

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.

StephanieDoan3B
Posts: 21
Joined: Fri Sep 29, 2017 7:07 am

Re: Polar ve non polar

Postby StephanieDoan3B » Sun Nov 19, 2017 7:58 pm

Yes, polar vs. non polar is geometrically unequal vs. equal distribution of negative charge in the atom.

Paula Dowdell 1F
Posts: 72
Joined: Tue Nov 15, 2016 3:00 am

Re: Polar ve non polar

Postby Paula Dowdell 1F » Sun Nov 19, 2017 8:01 pm

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.

JonathanLam1G
Posts: 25
Joined: Fri Sep 29, 2017 7:04 am

Re: Polar ve non polar

Postby JonathanLam1G » Sun Nov 19, 2017 11:32 pm

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.

McKenna disc 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:04 am

Re: Polar ve non polar

Postby McKenna disc 1C » Mon Nov 20, 2017 12:19 pm

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!

Sophia Kim 1C
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

Re: Polar ve non polar  [ENDORSED]

Postby Sophia Kim 1C » Mon Nov 20, 2017 12:39 pm

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.

Natalie LeRaybaud 1G
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

Re: Polar ve non polar

Postby Natalie LeRaybaud 1G » Mon Nov 20, 2017 2:43 pm

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.


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 4 guests