Jay-qu Posted September 18, 2006 Report Share Posted September 18, 2006 Polar molecules have elemental components that are arranged in a manner that provides a "negative end", and a "positive end". Water is one such molecule. The hydrogens have a slight positive charge, and the oxygen has a slight negative charge. This is especially important in biology for multiple reasons. For instance, polar molecules are eoften very good solvents.You can ask our user HydrogenBond for more info. :Waldo:..extending..Polar bonds arrise from a difference in electronegativity between the bonding atoms. This means that one atom is better at 'pulling' the electrons towards it. In the case of water, it is because the oxygen atom has 8 protons to pull with, while the hydrogen only has 1.. this makes the electron in the hydrogen atom get pulled towards the oxygen and hence making the hydrogen part of the water molecule slightly positive, the oxygen then becomes slightly negative. It is this effect that makes water liquid at such high temperatures and also that when it freezes it expands B) Quote Link to comment Share on other sites More sharing options...
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