(Polar molecules, Non-polar molecules, etc.)
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I took the test Friday and was really confused by a problem. If a molecule has 4 of the same bond atoms then it is non-polar(CH4). That is because the electronegativity values are the same. However if there are two of the same and two different shouldn't it also be non-polar? Sure the electronegativities are different but they should still cancel out? Someone mentioned the net dipole moments not being the same but I am still confused. Let's use CCl2H2 for instance.
The reason that molecule is polar is that the shape is tetrahedral, which means the two Cl atoms aren't going to be opposite of each other. Since they aren't opposites of each other, they will not cancel out and as a result, the molecule will have a net dipole
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