Answer:
A polar molecule may have one or more lone pairs.
A polar molecule has an uneven distribution of electron density.
Explanation:
A molecule in which the dipole bonds will not cancel is a polar molecule. It depends on the geometry of the molecule, and the direction of the dipole. So, to be polar, the molecule must have at least one polar bond. It may have nonpolar bonds, but the total dipole must be different from 0.
A polar bond is formed between elements that have large differents in electronegativities, such as chlorine and hydrogen. When an atom has a large electronegativity, it has lone pairs of electrons in a bond because it has a small size and a great number of electrons in the valence shell. So, a polar molecule may have on or more lone pairs.
Because of the lone pairs presented, and because of the dipole different from 0, it will be partial charges in the atoms, so a polar molecule has an uneven distribution of electrons density.
A polar molecule is a molecule that has opposite charges at both ends of the molecule.
The true statements about polar molecules are;
To say that a molecule is polar means that it has opposite charges at either end of the molecule.
These charges result from uneven distribution of electrons in the molecule. This uneven distribution of electrons in the molecule is also caused by the large difference in electronegativity between the bonding atoms. This electronegativity difference causes the electron density of the bond to draw closer one of bonding atoms thereby conferring a partial negative charge on that atom and a resulting partial positive charge on the other atom.
Many polar molecules have lone pairs on atoms in the molecule such as NH3, H2O, H2S, etc.
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