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Water molecules are polar covalent molecules, meaning that the two hydrogens share their electrons with the oxygen, but the electrons "spend more time with" the oxygen. This is because oxygen is more electronegative than hydrogen, and attrcts electrons more strongly. Since the concentration of electrons is greater around the Oxygen, the Water molecule is slightly negatively charged at the oxygen end, and slightly positively charged at the hydrogen end. This polarity allows water molecules to dissolve compounds very easily, because they can strongly attract polar ends of other molecules. This helps your body with all of the chemistry it does to eat and function.

In addition to polarity, water is more dense than ice. This means that ice will float on water. If this was not true, than many animals would never have been able to live and grow in watery environments, and life on earth may never have become larger than microscopic organisms.

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