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A water molecule, abbreviated as H2O, is an example of a polar covalent bond. The electrons are unequally shared, with the oxygen atom spending more time with electrons than the hydrogen atoms. Since electrons spend more time with the oxygen atom, it carries a partial negative charge.Another example of a polar covalent bond is between a hydrogen and chlorine atoms. In this bond, the chlorine atom spends more time with the electrons than the hydrogen atom.hey are not equally sharing the toys. This unequal sharing also happens with a type of bond called polar covalent bonding. Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms.
If the molecule contains polar bonds that are of equal polarity and point in opposite directions, they cancel out, leaving the molecule nonpolar. If there is a net direction to the polar bonds, then the molecule is polar. Carbon dioxide is a good example to see this in. The C-O bonds in the molecule are polar, but because the molecule is linear and the C-O bonds point in opposite directions, the molecule is nonpolar overall. The polar bonds cancel one another out. The same thing applies to carbon tetrachloride. The C-Cl bonds of the molecule are polar, but because they all symmetrically point to the four corners of a tetrahedron, they cancel one another out. In a molecule like water, however, the polar O-H bonds do not cancel one another out perfectly.