(Polar molecules, Non-polar molecules, etc.)
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In most scenarios, you'll be able to give a good guess right off the bat based on the electronegativity difference between the molecules in question. However, you should always draw the Lewis structure, because dipole moments might cancel out resulting in a non-polar molecule. Hope this helped!
Initially, you should have a pretty good idea as to whether or not a molecule is polar based on electronegativity differences, however polar bonds can be canceled out by geometry. To be sure, I always draw the lewis structure because it helps me, but if you are confident without drawing it than that works too!
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