(Polar molecules, Non-polar molecules, etc.)
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If you draw in the dipole moments (with the arrows) for all elements within a molecule and all dipole moments cancel each other out, than the molecule is nonpolar. If the dipole moments do not cancel each other out, than the molecule is polar. Also professor Lavelle described it in lecture that if a molecule has a preference in orientation when bonding w/ a cation or anion, than it is polar. If it doesn't have a preference in orientation when binding, than it is nonpolar. So when determining polarity of a molecule, it is very helpful to draw out the lewis structure of the molecule and draw in the dipole moments.
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