Review why polar covalent bonds will form. Examine the concept of partial charge on molecular ends. Using molecular models, have Joshua construct and then draw on the board a hydrogen oxygen bond and then a water molecule. Elicit the partial polarity each, and then determine thate the water molecule is asymmetrical and polar covalent. Construct a carbon-chlorine bond, determine its polarity. Construct a carbon tetrachloride molecule and elicit why this molecule is non polar, even though it is composed of polar C-Cl bonds.