why does the volume of water increases when freezed ?

Answer 1

at 4degree c water has highest density but if we increase or decrease the temperature water density start decreasing . when we decrease temperature of water water molecules start attaching with eachother by inter moleculer hydrogen bonds one molecule of water associates 4 other molecules by this bond ,forming a big molecule but all the molecules of water in this big molecule is not well packed and a lot of space is left in side the big molecule we call it cavity and this cavity increase the volume but not the mass . so density decrease means volume increases,
but if we change the ice into water then this intermolecular hb breaks and free water molecules start filling this cavity and hence density increases upto 4degree c, but if we further raise temperature the thermal expansion of the water happens and it causes density decreasing ie volume increement

Answer 2

Homogeneous nucleation
Homogeneous nucleation occurs in pure water in which there is no contact with any other foreign substance or surface. With homogeneous nucleation, the conversion of the liquid state to solid state is done by either lowering temperatures or by changes in pressure. However, temperature is the primary influence on the conversion of water to ice or ice to water is temperature.

In homogeneous nucleation, the nucleation begins when a very small volume of water molecules reaches the solid state. This small volume of molecules, is called the embryo and becomes the basis for further growth until all of the water is coverted. The growth process is controlled by the rate of removal of the latent heat being released. Molecules are attaching and detaching from the embryo at roughly equal and very rapid rates. As more molecules attach to the embryo, energy is released causing the temperature of the attached molecules to be lower than the temperature of the unattached molecules. The growth rate continues until all the molecules are attached. At this point, you have the solid state (ice).

Answer 3

In a liquid state, the water molecules are moving around randomly; when water freezes, the molecules form a crystalline lattice structure with definite spacing between molecules. The average intermolecular spacing in the crystal is larger than the average distance between freely-moving molecules, so the same amount of matter (same number of molecules) takes up more space in crystal form.

Answer 4

The density of ice is less than that of water. So, when water freezes, the volume will of course increase.

Answer 5

H2O has the highest densityat 4degreeC
IN LIQUID state the molecs r close to each other
when cooled further
air gets trapped in b/w the molecs
the bonding distance increases
more spaces r fomed
and hence ice occupies more space
there4 it has less density
and hence ice floats on water

Answer 6

the water molecules form small rings when frozen, which takes up more space than in its liquid form. Water is the only substance that does this.

Answer 7

because air gets trapped inside

Answer 8

it has somethin to do with hydrogen bondin