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amy369

Polarity is about PARTIAL charges. There is no real charge involved. For example water (H2O) is a polar molecule, because O has a stronger electronegativity than H (that means O attracts electrons stronger than H). Because of this attraction the electrons are often next to the O and so we can say that O has a negative partial charge and both H's has a positive partial charge. 

Non polar means no partial charged.

I hope I could help a bit (and sorry for the bad english)

The arrangement or geometry of the atoms in some molecules is such that one end of the molecule has a positive electrical charge and the other side has a negative charge. If this is the case, the molecule is called a polar molecule, meaning that it has electrical poles. Otherwise, it is called a non-polar molecule.

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