Look at the simulation for Sodium Chloride again. Run the simulation then observe the energy diagram. It says that the energy of the NaCl compound is lower than the energy of the Na + Cl products. How does this explain the pack getting cold?
I haven't watched the simulation; i don't know where it is. if you can describe it to me perhaps I canhelp. But you will need to clean up your post. For example is that Na^+(aq) and Cl^-(aq) and what's the form of the NaCl.
