(Polar molecules, Non-polar molecules, etc.)
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In polar molecules, dipoles do not cancel (e.g. CHCl3). The lewis structure of this molecule has one side that is more electronegative (Cl) than the other (H). An arrow would be drawn towards the more electronegative side -- Cl, indicating a dipole moment.
Dipole moments go towards the more electronegative element in a molecule. To determine polarity, consider the shape of the molecule itself. Take into account the arrows, where they're going, if they cancel out, or if they're different atoms. If everything cancels out, it's nonpolar, but if it's even slightly off it will be polar.
Dipole moments are basically when the atoms that are drawn have differences in electronegativity. If you want to see if a molecule is polar, look at the overall structure. Sometimes there could be polar bonds but the structure's dipole moments could cancel each other out, and therefore be nonpolar.
Dipole moments only occur in polar molecules when there is a difference in electronegativity. If you draw the arrows on the Lewis structure there will be a dipole moment when the arrows do not cancel out, meaning they are not pointing is opposite directions basically.
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