Question

I’m looking for some help on part C and D :)

Answer 1

No, interatomic bonds aren't broken during boiling.

Yes, intermolecular forces are overcome when water boils.

Explanation:

Boiling of water is a physical change of state that converts the liquid water into water vapour. This process takes place in 100°C.

In liquid water, there are different forces of attraction between the molecules of water, most importantly the van der Waal's force, and the hydrogen bonds. van der Waal's forces are very weak, so of negligible importance. But hydrogen bonding are of significant strength. They are present between the hydrogen atoms and the oxygen atoms of different molecules of water. During boiling, these forces are weakened by the increasing kinetic energy of molecules and the water molecules start to boil off as water vapour. There's no breaking of interatomic bonds, which would have produced hydrogen and oxygen gases instead of water vapour.