The Cool Reaction Thermodynamics Chemistry Demonstration Kit shows that endothermic reactions can be just as exciting as exothermic reactions. One example is when the solids barium hydroxide and ammonium thiocyanate are mixed together in a beaker.
Many reactions produce heat. In fact, when students think of chemical reactions, heat production is often expected. However, endothermic reactions—reactions that consume heat—can be just as exciting. One of the most striking examples of this is when the solids barium hydroxide and ammonium thiocyanate are mixed together in a beaker. Teacher Demonstration Notes included.
Concepts: Endothermic reactions. Time Required: 20 minutes Chemicals Provided: Ammonium thiocyanate and barium hydroxide. Note: A thermometer is required and available separately.