Question

what is mean by polar molecules.

Answer 1

A polar molecule has a net dipole as a result of the opposing charges from polar bond arranged asymmetrical.

Answer 2

A polar molecule is a molecule containing polar bonds where the sum of all the bond's dipole moments is not zero. Polar bonds form when there is a difference between the electronegativity values of the atoms participating in a bond. Polar molecules also form when the spatial arrangement of chemical bonds leads to more positive charge on one side of the molecule than the other.​

Examples of Polar Molecules

Water (H2O) is a polar molecule. The bonds between hydrogen and oxygen are distributed so that the hydrogen atoms are both on one side of the oxygen atom, rather than evenly spaced. The oxygen side of the molecule has a slight negative charge, while the side with the hydrogen atoms has a slight positive charge.

Ethanol is polar because the oxygen atoms attract electrons because of their higher electronegativity than other atoms in the molecule. Thus the -OH group in ethanol has a slight negative charge.

Ammonia (NH3) is polar.

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