Answer:
endothermic reactions
Explanation:
An instant cold pack is a device that consists of two bags; one containing water, inside a bag containing ammonium nitrate, calcium ammonium nitrate or urea. When the inner bag of water is broken by squeezing the package, it dissolves the solid in an endothermic reaction.
Endothermic reactions is occurring when you activate an instant cold pack.
An endothermic reaction is any chemical reaction that absorbs heat from its environment.
The absorbed energy provides the activation energy for the reaction to occur. A hallmark of this type of reaction is that it feels cold.
An instant cold pack is the perfect example of an endothermic reaction. There are many possible ingredients in an instant cold pack, but they often contain solid ammonium nitrate and water.
The liquid inside the cold pack is water.
In the water is another plastic bag or tube containing ammonium-nitrate fertilizer. When you hit the cold pack, it breaks the tube so that the water mixes with the fertilizer.
This mixture creates an endothermic reaction, it absorbs heat.
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