Question

In a polar, covalent bond, why might one area of a molecule be more negative than other areas of the molecule?

Answer 1

Electrons are transferred in Ionic bonds. 
Electrons have a negative charge so a negatively charged area has a high concentration of electrons 

C

Answer 2

Answer:

C. The atoms share electrons, but the electrons spend more time around that area of the molecule.

Explanation:

In a polar covalent bond between two non-metals electrons are shared. The two non-metals in the covalent bond have a difference in electronegativity. The atom with higher electronegativity attracts the shared pair of electrons more towards itself thus gaining a partial negative charge, and the other atom in the bond gains a partial positive charge.