Table of electronegativities           Polarity           Examples of polar and non-polar molecules           Exercise: Polar and nonpolar molecules           Polarity: Consequences           Polarity: Complex ions           Copper(II)and chloride complex ion           Copper(II) and ammonia complex ion           Determination of water of hydration           The hydrogen bonds: Structures of proteins           The hydrogen bonds: Structure of DNA           Temporary polarity: Van der Waals force           Temporary polarity: Consequences