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H2O is a liquid because it is a very polar molecule. The oxygen atom has a partial negative charge and the hydrogen atoms have a partial positive charge. The positive and of one molecule is attracted to the negative end of another. So, water molecules are strongly attracted to one another in a similar sense as magnets are. Because of this attraction it is requires a fairly large amount of energy to force water molecules apart, which would turn it into a gas.

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14y ago

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