What happens to water when it changes to ice?

Its density increases.

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its density decreases.

Its mass increases.

Its mass decreases.

Its volume increases.

Its volume decreases.

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When water is changed into ice it have low density and larger volume.

Explanation:

Water molecules are connected with each through hydrogen bonding.

When water is changed into ice the distance between water molecules increases and thus ice occupy large volume and its density decreases because of larger distance between molecules and empty spaces present between them.

That's why when ice is drop into water ice float on the surface because of low density.

While the object with greater density than water are sink into it when placed into water.

The density of water is 1.00 g/cm³ while density of ice is 0.92 g/cm³.