Question

what happens to molecules of ionic compounds when they are heated​

Answer 1

Answer:

So as you keep heating you get hot liquid salt, then vaporized salt molecules. At some point the energy exceeds the ionic bond energy and you would get free ions and eventually you would start stripping off the electrons.

Explanation:

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Answer 2

Answer:

Most basic chemical texts that treat crystals of ionic compounds will give you the answer in some depth with examples. In short the crystal lattice can be broken up more easily than the single molecule, even though it is an array of ions, because electric neutrality is not violated. yes charged species are taken form their spots in the crystal, but by going in pairs the crystal remaining and the molecule leaving are net electrically neutral. In this way the relatively large amount of energy to separate charges is avoided, and of course where possible the lowest energy path is typically taken by the VAST majority of entities in all natural processes.  So as you keep heating you get hot liquid salt, then vaporized salt molecules. At some point the energy exceeds the ionic bond energy and you would get free ions and eventually you would start stripping off the electrons. all of that would require some rather outstanding levels of heat but for tiny samples could certainly be achieved.