Question

which of these is a polar covalent bond? (hint: nonpolar covalent bonds share electrons evenly and will have the same electronegativity) * 5 points
h2
cl2
h2o
o2

Explanation:

A polar covalent bond occurs when there is an unequal sharing of electrons due to a difference in electronegativity between the two atoms. In $H_2$, $Cl_2$, and $O_2$, the atoms are identical, so they have the same electronegativity and form non - polar covalent bonds. In $H_2O$, oxygen is more electronegative than hydrogen. The difference in electronegativity causes the electrons in the $O - H$ bonds to be pulled more towards the oxygen atom, resulting in a polar covalent bond.

Answer:

H2O