Present a hands on lab which demonstrates decomposition reactions. Prior to the lab work, discuss and define the type of reaction seen as a decomposition reaction.
The lab involved the decomposition of hydrogen peroxide to form oxygen gas and water, using a catalyst.
The second reaction involved the decomposition of calcium carbonate (marble)_ by heat to release carbon dioxide gas.
Both reactions involved testing for their presence using a glowing splint in oxygen and a burning splint in the carbon dioxide test tube.