Identify the type of intermolecular attractive force(s) that are present in , . If only one attractive force exists enter 'none' for the secondary attractive force.

Rules for predicting whether a molecule is polar (has a permanent dipole) or is nonpolar:

• If the central atom has one or more unshared, nonbonding, pairs of electrons the molecule is most likely polar. Examples include; NH₃, H₂O, SO₂

• If the central atom has no unshared, or nonbonding, pairs of electrons and nonidentical terminal atoms the molecule is polar.

• If the central atom has has no unshared, or nonbonding, pairs of electrons and the terminal atoms are identical the molecule is nonpolar.

To recognize a polar substance (you have to do this on the review problem set) you must draw the Lewis structure (see your textbook or checkout the CHEM 1314 lecture notes). After drawing a Lewis structure look at the central atom and apply the rules above.

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