Why water volume increases when we subjected to cooling?
Answer:
increased hydrogen bonding:
By 0 C. (32 F.), the H2O molecules are lined up in a frozen crystal lattice, an open hexagonal (six-sided) shape. Unlike in liquid water, the molecules in ice are held rigidly apart. That means more empty space between molecules, so frozen water occupies more room
Not so sure it increases with cooling, though it certainly does on freezing.
Ice takes on a particular structure, this takes up more 'space' than water as a liquid (one of the few liquids to do this). The crystallization occurs due to the molecules re-arranging themselves, i.e. the hydrogen bonding increases to form this new structure.
It's option 2-increased hydrogen bonding.
Ice has a crystal structure where all water molecules form a e dimensional hydrogen bonding network. They thus form these nice 3-fold symmetry crystallites that are famous around christmas. When water melts, some of the hydrogen bonds are broken, and thus the now free molecules can can move (relatively) freely and donot have to form this bulky 3 dimensional network, and thus the volume decreases.
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