(Polar molecules, Non-polar molecules, etc.)
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it depends on the atoms but in the case of C2H2Cl2 that can be cis or trans. Cis means that the Cl and H are on the same sides. This would be polar because there is a heavy pull on one side and not such a strong pull on the other side. in the trans molecule the Cl and H are distributed opposite from each other so the strong pull of Cl is countered by the other Cl and the H is countered by the other H
All the atoms surrounding the central atom must be the same in order for the molecule to be non-polar. Since there is Cl and H, that means this molecule will be non-polar because of the electronegativity differences, and the dipoles will not cancel out. The molecule can be either cis or trans, but it will still be non polar regardless in this situation.
Nonpolar molecules have zero dipole moment while polar molecules have a nonzero dipole moment. CCl2H2 is polar because the difference in electronegativity between Cl and H are different which creates a difference in dipole moment between the central atom, making it nonzero.
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