(Polar molecules, Non-polar molecules, etc.)
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Take a look at which is more electronegative. The more electronegative atom is the area which you can consider a negative pole. More specifically, if the net vector of these poles would be where the negative pole is.
To determine where the negative pole of a molecule lies, you must look at the atoms' electronegativities and compare them to one another. Negative poles will form around the most electronegative parts of a molecule. If there are two relatively equal electronegativities, the negative pole will be somewhere in between the two atoms. A good example of this is question #10 on the Sapling homework. In COF2, we can quickly acknowledge that fluorine is the most electronegative atom present and thus, this implies the negative pole will form there. It is important to recognize that fluorine is more electronegative than oxygen. However, since there are two, the negative pole will lie somewhere in between the fluorine atoms. In COFH, we can acknowledge that the two most electronegative atoms in the molecule are oxygen and fluorine. As a result, the negative pole will be somewhere in between the oxygen and fluorine atom.
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