1. The problem statement, all variables and given/known data Multiple choice: In which of the following processes are covalent bonds broken? a) solid sodium chlroide melts b) bronze melts c) sucrose dissolves in water d) solid carbon graphite sublimes e) solid carbon dioxide sublimes 2. Relevant equations none 3. The attempt at a solution D is the correct answer according to my prep book, but I do not understand why this is true. I think that sublimation is a physical change and like all physical changes we are overcoming intermolecular forces, not breaking intramolecular bonds. How is D thus true for graphite then? Thanks!