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Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:21 pm
by Lauren Lewis3L
Can explain what it means when it states in the book that it is nonpolar if it can "cancel out". I am just confused as to what is being cancelled when talking about atoms?

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:23 pm
by Sidharth D 1E
They mean that the dipole-dipole vectors from two opposite atoms when added together equal to zero. A nonpolar molecule has a net dipole movement of zero.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:23 pm
by ASetlur_1G
I think it means that even if a molecule has polar bonds, if the dipole moments cancel out (they are symmetrical), then the molecule is considered nonpolar.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:23 pm
by Myka G 1l
A molecule is also considered non polar if it has polar bonds and is symmetrical because the charges "cancel out" because they are distributed evenly among the molecule.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:23 pm
by SVajragiri_1C
For example, in the molecule CO2, the bond C-O itself is polar, but since the molecule CO2 is linear (O-C-O), the polarity of each bond cancels each other out due to the symmetric shape of the molecule. This concepts applies to most types of molecules.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:25 pm
by Reagan Smith 1H
If the dipoles of two atoms are pointing in the same direction (such as the hydrogens in water) the dipoles do not cancel out and therefore water is polar, but if two vectors do cancel, the molecule is nonpolar.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:25 pm
by Brianna Becerra 1B
An example where the charges "cancel out" can be seen through the example BeCl2. Here, there is a negative charge on both of the cl which is on opposite ends meaning the arrows drawn will go away from each other making it so that the charges cancel out and it is now considered to be non-polar.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:25 pm
by Brianna Becerra 1B
An example where the charges "cancel out" can be seen through the example BeCl2. Here, there is a negative charge on both of the cl which is on opposite ends meaning the arrows drawn will go away from each other making it so that the charges cancel out and it is now considered to be non-polar.

Re: Polar vs. Nonpolar

Posted: Sun Nov 17, 2019 9:27 pm
by ckilkeary 2G
Nonpolar means that the dipole moments cancel out. In the case of CO2, because the oxygens (one each side) have the same strength of "pull" and effectively cancel each other out. Think of if as if there were two of the same person pulling at each side in tug of war. The rope in that game wouldn't be pulled in any direction because equal strength is pulling in opposite directions.