(Polar molecules, Non-polar molecules, etc.)
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Hi I'm having trouble still picturing the shapes in 3D, which is problematic because that has a lot to do with polarity of a molecule. Does anyone have any advice on how to solve this? I know mostly you have to determine polarity on a case by case basis but is there any way to have a key like this shape is most likely polar, etc.
There is a diagram in the textbook that tells us which geometric shapes result in nonpolar compounds as long as the surrounding atoms are the same. It's really helpful. Drawing net dipoles also helps logically reason why a certain molecule is polar or nonpolar.
Drawing net dipoles helps a lot, but you need to make sure that you are not just cancelling dipoles that seem opposite each other. For example, in CHCl3, you can't cancel the dipoles of Cl that are across from each other, because the bond angle is actually 109.5 and not 90/180. Also, when there is a lone pair, it is quite likely that the molecule is polar. I've found that doing practice problems and looking up worksheets online helps you kind of gauge how to look for polarity.
First, I think you should check the textbook, there is a picture that draws out all the molecular geometry along with their polarity. Second, the polarity can be determined based on whether the surrounding atoms are the same, if they are the same, then it's likely to be non-polar; if the surrounding atoms are not the same, then it's more likely to be polar.
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