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    when water turns to ice
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    In water (as you know)...there is hydrogen bonds between the molecules. As you convert from water to ice the hydrogen bonds are kept intact and the structure of ice becomes a ring (sort of...) of water molecules.

    This is why Ice floats on top of water as the molcules are spread out and ice is less dense that water molecules which are close packed.
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    in ice, each H2O molecule is surrounded by 4 molecules with hydrogen bonds tetrahedrally. it adopts an open structure and the relative translational motion of molecules is not possible
 
 
 

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