biology???

Question

why water becomes less dense when it freezes and why this is important to all living things??

Answer 1

The hydrogen bonding properties of water make the solid version less dense than the liquid version.

This is important to all living things because if ice sank, all the fishies would freeze to death and the food chain would go to hell.

Answer 2

Because there are hydrogen bounds between oxygen of one molecule and hydrogen of an other molecule. This makes liquid water more dense than ice. It is important especially in cold countries . When a river freezes the ice floates on the surface of water, and under the ice water remians liquid.Else all the river would freeze and the animals have no water to drink

Answer 3

Ice is less dense than liquid water

* Water is less dense as a solid than as a liquid
* most substances become more dense as temperature decreases
* water is most dense at 4° C then becomes less dense as temperature decreases below that point
* hydrogen bonds in liquid water are unstable
o they constantly break and re-form
* hydrogen bonds in ice are stable
o each molecule bonds to 4 neighbors forming a 3-D crystal
* liquid water expands (becomes less dense) as it freezes because
* H bonds joining water molecules in crystalline lattice keep molecules far enough apart to give ice a density about 10% less than density of water
o less dense frozen water (ice) floats on more dense cold, unfrozen water
* Ice is less dense than liquid water
* frozen water floats on liquid water
o extremely important factor in enabling life to appear, survive and evolve
o if ice were more dense than water it would sink
+ all ponds, lakes, oceans would freeze solid from the bottom to surface making life impossible
* since ice floats on water instead of sinking
o a body of deep water freezes at top, becoming covered with floating ice
o ice insulates liquid water below it
+ preventing water from freezing solid
+ allowing certain animals and plants to survive below icy surface

Answer 4

bcoz the interamolecular forces get decreases.means the distance b/w the molecules of water become more