How Do Polar Bonds Affect the Density of Water?

[munky99999]

ok so 20 degrees celcius water, then you cool it. density increases until 4 degrees. if u cool it more, density decreases.

Why is that?

does it have to do with the type on polar bonds water has?

 

[Bladibla]

ok so 20 degrees celcius water, then you cool it. density increases until 4 degrees. if u cool it more, density decreases.

Why is that?

does it have to do with the type on polar bonds water has?

Yes. Its because of the type of INTER-molecular forces that water has. I presume you know about hydrogen bonding, with the hydrogens becoming slightly positive and the oxygen negative.

When water freezes, the water molecules form a lattice (hydrogen bond lattice) which maximises the amount of space inbetween. Thats why water, when frozen, has lower density than when it was liquid.