Celebrating Chemistry with Thermodynamics
Sarah Chisnell - Staff Scientist | Discovery Theatre - 2011-08-15
Endothermic reactions are reactions that have lost energy
and heat has been absorbed. An excellent example of an endothermic reaction is
that of cold packs. Inside cold
packs there is a chemical, usually ammonium nitrate and water, when you mix
those chemicals together the reaction is endothermic, and the product feels
cold.
Exothermic reactions are reactions that have released energy
through the reaction and produce heat.
An excellent example of an exothermic reaction is that of heat packs.
Inside heat packs there is a chemical, usually sodium acetate and water, when
you mix those chemicals together the reaction is exothermic, and the product
feels hot.
To see what happens inside hot and cold packs watch the video below.
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