Summary: Calcium chloride (exothermic) and ammonium chloride (endothermic) are added to water. The temperature change of the solution is measured and displayed using a large digital thermometer. The demonstration can be done either qualitatively or quantitatively. Other salts can be used in place of those listed.
Chemicals and Solutions:
Calcium chloride 10 g (record weight used)
Ammonium Chloride 10g (record weight used)
Digital display and temperature probe
Two 250mL beakers,
Dissolve each salt in 100 mL water and show the temperature change