Polar vs. Non-polar

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Gabriela Carrillo 1B
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Polar vs. Non-polar

Postby Gabriela Carrillo 1B » Wed Nov 08, 2017 9:52 pm

If asked to identify if a bond is polar or non-polar, would we be given the distance between the two atoms in order to calculate the electric dipole moment??

Lucian1F
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Re: Polar vs. Non-polar

Postby Lucian1F » Wed Nov 08, 2017 9:55 pm

We don't need to know how to calculate a dipole moment. We only need to know what it is and determine if there is one

Lauryn Jordan 1F
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Polar vs. Non-polar

Postby Lauryn Jordan 1F » Wed Nov 08, 2017 11:29 pm

How can you tell if a compound is polar or non polar?

dstemp
Posts: 20
Joined: Fri Sep 29, 2017 7:07 am

Re: Polar vs. Non-polar

Postby dstemp » Wed Nov 08, 2017 11:31 pm

I believe to determine if a molecule is polar or non-polar, it is only important to know the charges on the ends of the molecule and the difference in electronegativity between bonded atoms, since ionic bonds are pretty much guaranteed to be polar.

Angel Ni 2K
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Re: Polar vs. Non-polar

Postby Angel Ni 2K » Wed Nov 08, 2017 11:38 pm

If the molecule is not symmetric, then it is (generally) polar because the dipole moments (if any) do not cancel out. If the molecule is symmetric but the outside atoms are not the same, then it is polar because the dipole moments do not cancel out. If the molecule is symmetric and the outside atoms are the same, then it is non-polar.

dstemp
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Joined: Fri Sep 29, 2017 7:07 am

Re: Polar vs. Non-polar

Postby dstemp » Wed Nov 08, 2017 11:47 pm

This isn't always true though. For example H20 has the same outer atoms and appears symmetric, but is actually very polar.

804899546
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Joined: Sat Jul 22, 2017 3:00 am

Re: Polar vs. Non-polar

Postby 804899546 » Fri Nov 10, 2017 7:19 pm

In order to determine if the bond itself is polar, we look at the difference in electronegativity of the elements involved along with the characteristics of these elements (does it dissolve in water, etc.). If asked if the entire molecule is polar or nonpolar, that is when we look at if the molecule is symmetrical and if the outside atoms are the same/different.

kaushalrao2H
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Re: Polar vs. Non-polar

Postby kaushalrao2H » Fri Nov 10, 2017 11:01 pm

Only diatomic molecules (ex. H2) have a truly nonpolar bond. If the two elements involved in the bond are different, there's going to be at least a little bit of electronegative difference, which results in a slightly polar covalent bond. Polarity of an entire molecule is different than when we are talking about the polarity of a single bond between two of the elements.


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