Is a Cold Pack Endothermic or Exothermic?

An instant cold pack is the perfect example of an endothermic reaction.

How is a cold pack endothermic?

Are these reactions endothermic or exothermic? Cold packs are endothermic because they take heat from their surroundings.

Is an instant cold pack a chemical change?

The process in making the cold pack is not a chemical reaction but merely the physical act of dissolving. When ammonium nitrate is dissolved in water, the process is endothermic, thus producing the cold pack.