How do molecules' atoms separate from them, and what happens to the atoms afterwards?

Question

How do molecules' atoms separate from the molecules themselves (for example, a hydrogen atom separating from a water molecule)? And do they have to go to another molecule afterwards?

Answer 1

well, if an atom separates from a molecule it has to go somewhere as that is the reason it separated in the first place. the atoms are only separated when a reaction happens, the product created is unstable and there is another product which is stable and will remain stable even after its lost an atom and also provided that the atom so given can stabisize the unstable product. under all those conditions an atom is transferred.

Answer 2

I think they do that because they were boiling.