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The Chemical and Physical Properties of Water Water consists of two volumes of hydrogen to one volume of oxygen. The hydrogen atoms are arranged at a bonding angle of 105 degrees. This makes the water molecule polar because the shape of the molecule is such that it has a positive end and a negative end. This polarity accounts for the strong bonding between the molecules and peculiar properties of water, e.g. Relatively high melting and boiling point, expands when freezes. Because of its polarity water is a good solvent, attracting both the positive and negative charges of other solutions. This is very important because all chemical reactions in cells take place in aqueous solution. Water has a pH of 7, which makes it a neutral liquid medium. It’s neutrality ensures that reactions taking place within living organisms are not d