Energy and entropy > exothermic

Students carry out three test-tube reactions and use their hands on the base of the test-tube to detect whether the process gives out or takes in energy and is classified as being exothermic or endothermic.

This is a useful class practical to introduce energy changes in chemical reactions. The students measure the temperature changes in four reactions, and classify the reactions as exothermic or endothermic. The experiments can also be used to revise different types of chemical reaction and, with some classes, chemical formulae and equations.