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The Importance Water as a molecule Polar Structure Water has the chemical formula H2O and each water molecule consists of an oxygen atom covalently bonded to two hydrogen atoms at an angle of 104. The oxygen atom has a nucleus containing eight positively charged protons, 8 neutrons and 8 negatively charged electrons. (diagram) The oxygen atom has an overall partial negative charge while the hydrogen atoms have slight positive charges, this is because the electrons are associated with the oxygen nucleus than the hydrogen nuclei and these electrons form a region of negative electric charge, making the whole molecule electrically polarized. It creates partially negative and partially positive charges on the ends of a water molecule. This uneven charge distribution results in the molecule as being described polar and they accounts for the strong bonding between molecules and for the unusual properties of water, e.g. expansion as it freezes. Because water...

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