Commercial cold packs and hot packs are available for treating athletic injuries. Both types contain a pouch of water and a dry chemical. When the pack is struck, the pouch of water breaks, dissolving the chemical, and the solution becomes either hot or cold. Many hot packs use calcium chloride, and many cold packs use ammonium nitrate. Write reaction equations to show how these strong electrolytes break apart in water. (Include states-of-matter.use the lowest possible whole number coefficients.