Hydrogen bonding between water molecules is due to polar covalent bonds, resulting in attractive forces between the slightly positive hydrogen end and the slightly negative oxygen end.
Hydrogen bonding is the property of the water molecule that causes two water molecules to be attracted to each other. This attraction occurs due to the slightly positive charge on the hydrogen end of one water molecule being attracted to the slightly negative charge on the oxygen end of another water molecule. The polar covalent bonds in water, resulting from the difference in electronegativities between hydrogen and oxygen, lead to the formation of hydrogen bonds between water molecules.
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