Camping stores sell hand warmers which consist of a thick outer plastic bag with

Question

Camping stores sell hand warmers which consist of a thick outer plastic bag with two thin plastic bags inside. One bag is filled with water and the other with a salt. When your "slag" the outer bag, the thin inner bags mix their contents and produce heat. Is the salt in the inner bag ammonium nitrate calcium chloride? Explain your answer. "Cold packs" are sold for emergency use on the athletic fields. They consist of a thick outer plastic bag with two thin plastic bags inside. One bag is filled with water and the other with a salt. When you the outer bag, the thin inner bags mix their contents and the bag becomes cool. Is the salt in the inner bag ammonium nitrate or calcium chloride? Explain.

Explanation / Answer

5. In this case, the salt is Calcium chloride, because the dissolving process of CaCl2 in water is highly exothermic.An exothermic process is one that releases heat and rapidly produces temperatures. Because the energy release in the bond breaking process is more than that of bond formation.

6. In this case, the salt is Ammonium nitrate, which in presence of water undergoes endothermic reaction absorbing heat from the surrounding. Because the energy release in the bond breaking process is less than that of bond formation.

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