Water:
- Water contains a POLAR COVALENT BOND, which results in an uneven sharing of elctrons between the H and O atoms. The O holds electrons more closely and is thus, ELECTRONEGATIVE and the H holds electrons farther away and is ELECTRONEGATIVE. With the use of the simple rule of OPPOSITES ATTRACT it is clear that when two water molecules are near each other the H attracts the O and this is described as H bonding, very significant for many reasons such as surface tension but that's another story.
- Below is a link to a short and informative explanation of this phenomena:
http://www.youtube.com/watch?v=aH2IbYs_XjY&feature=related
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