last question: Yes, OH is most polar for your reason
Now on molecules, there is a big factor in the structure. If two polar bonds are aligned, the molecule is doubly polar, but if they are aligned in opposite direction, the two polar moments cancel.
Take CO2. It is a linar molecule O=C=O
each side is polarized, but in opposite directions. It has a net zero polar moment. Having a net dipole moment for a molecule means of you add up all the moments of each bond, and take consideration of their directions, then the vector (look up that word) is the net dipole for that molecule.
So in the end, two things matter:1) the difference in electronegativity of the bonded atoms (ie, how they share electrons), and 2) how the entire molecule is arranged.
Ok, having a different structure makes sense - so how would I know what the structure is like for a specific molecule?
You study Lewis structures and VSEPR theory.
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