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Do you mean it is polar because the oxygen is pulling electrons giving it a slight negative charge and the two hydrogens have a slight positive charge? Why doesn't this apply to CH4 which is to my knowledge non-polar?
Water has the VSEPR type AX4, which is tetrahedral. However, two of these ends are lone pairs, which leaves the two hydrogens connected to oxygen in a bent shape. This is why water is a polar molecule. CH4 on the other hand is non polar; although its shape is also tetrahedral, the central atom has no lone pairs. The symmetry of the tetrahedron allows the four dipoles to cancel.
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