How to tell if a molecule is polar - Polar Molecules - Part 3 - Real Chemistry

This is the last video in a series on polar molecules:
Polar Molecules Part 1
How to tell if a BOND is polar
• How to find electron a...
Polar Molecules Part 2
How to tell if a molecule is symmetrical
• How to tell if a molec...
Polar Molecules Part 4
How to tell if organic molecules are polar
• How to tell if organic...
In this video you will learn how to determine if a molecule is polar. Two things are needed for a molecule to be polar 1) it needs to have polar bonds and 2) there must be asymmetry in the way the bonds are arranged around the atom. If both conditions are met the molecule has a net dipole moment and is polar. If just one or none of these conditions are met, the molecule is non-polar. This video walks through how to determine if a molecule is polar.

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[@RexLiu]

i agree

[@dionel1388]

I agree wholeheartedly!

[@shai6198]

man i just watched 4 of ur vids!! underrated dood, thank u so much for making chemistry understandable

[@rosemarybergin7884]

thank you so much for this, I have been really struggling with this concept!

[@ibraheemyoussef]

I LOVE your videos! Keep up the great work!

[@gracelenahan4908]

Thank you so much! You are so good at explaining things

[@leandriduvos1565]

This helped me so much, thank you!

[@arjunpatel8247]

Thank you very helpful

[@supritha_bs]

THANKSSS MANNN🙌🙌 you're underrated :(

[@prkrsade4618]

I ionic also polar because for PF6 you considered 1.9 as polar which is ionic

[@kurianbiju1294]

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[@InfinityBladeStudios]

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[@Virginiamouse]

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[@user-wm1ro1zu8e]

Nice

[@whistlerspa]

With the C-H bond the electronegativity difference is 0.4 so the bond is slightly polar polar and should be taught as such. Technically only a 0 difference is non-polar.

[@PaisleyPlayfully]

Re the lewis dot for PF6. I tried drawing this and thought it would be 23 pairs +1e….so did I go wrong or are you drawing [PF6]- ?

[@anabelng3999]

Hi josh, how come PF6 is polar covalent when the difference in EN is 1.9? shouldn't it be ionic? Thanks.

[@RealChemistryVideos]

Hi Anabel,
PF6- does have polar bonds, but because it is symmetrical it is actually a non-polar molecule. The cut off for polar/ionic bonds is somewhat arbitrary and varies depending on the source you look at, generally ranging from 1.7 to 2. The details of this are complicated, but it has to due with electronegativity values being approximations. Like many things in chemistry, it is an extremely useful simplification that won't always be right...but its much easier than solving a physics problem for each bond haha.

[@lethaborababalela4580]

So it doent matter if there is a high electronegativity when you calculate the differences of the atoms?

[@RealChemistryVideos]

That matters, but is only 1/2 of the requirement! If it is also asymmetrical, then it would be polar.

[@shadwjjw6917]

does not NH3 is a Symetrical triangolar pyramidal ?
i did not understand what you said for explaining

[@RealChemistryVideos]

Hi Shad,
The symmetry question can be challenging! I have a whole video on just this aspect of molecular polarity. Check it out here: th-cam.com/video/nmssiDwyUno/w-d-xo.html

[@aidanbochey4153]

Hook em 🤘🏼