(Polar molecules, Non-polar molecules, etc.)
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You can determine whether molecules are polar or nonpolar by looking at the dipole moments of bonds. If the direction of the dipole moments cancel out, then the molecule would be nonpolar. On the other hand, if they don't cancel out, then the molecule is polar.
A CH2CL2 molecule is tetrahedral because there are four regions of electron density (VSEPR Model Formula of AX4). The C-H and C-Cl bonds are both polar in nature and looking at a tetrahedral shape, no bonds are opposite eachother and hence no bonds will cancel, causing the molecule to be polar.
it's helpful to look at the symmetry of a molecule when determining if it's polar or nonpolar. most symmetrical molecules are nonpolar and the opposite is also true. however differing electronegativities can also have an effect on the polarity of a molecule
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