Cold packs are presumably ammonium salts (judging by the stated contents). The temperature change is apparently the heat of solution of the salt. To Conduct Demonstration. Set off heat packs and cold ...

In this activity, students will feel the temperature change that occurs when a cold pack and a hot pack are activated. They will see that these temperature changes are due to a solid substance ...

Now, some cold packs use a chemical reaction to absorb heat. This is an example of something known as an endothermic reaction. And have you ever felt the heat from a candle?

Instant cold packs use ammonium nitrate and water to start an endothermic reaction. The potassium chloride can be found in the grocery store as a table salt alternative. The chemicals need to be ...

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction. The temperature of the mixture drops approximately 45oC and is cold enough to freeze the ...