(i) Why is ice less dense than water?
(ii) What kind of attractive forces must be overcome to melt ice?
(iii) Why does lakes freeze from top onwards?
Dear student!
1. Ice is less denser than water because of hydrogen bonding. Actually, in ice, the hydrogen bonds are shorter and they hold up more wtaer molecules in an open lattice which increases the volume of the water.
Since, density = mass/ volume
So, increase in volume decreases the density of ice.
When, these ice melt, the regidity of hydrogen bonds break and the water molecules come closer so that the volume decreases and density increases.
Due to paucity of time it would not be possible for us to solve all your queries. We are providing solution to one of your queries. Try solving the rest of the questions yourself and if you face any difficulty then do get back to us.
1. Ice is less denser than water because of hydrogen bonding. Actually, in ice, the hydrogen bonds are shorter and they hold up more wtaer molecules in an open lattice which increases the volume of the water.
Since, density = mass/ volume
So, increase in volume decreases the density of ice.
When, these ice melt, the regidity of hydrogen bonds break and the water molecules come closer so that the volume decreases and density increases.