What is the function of manganese dioxide?
It is a catalyst!
Manganese dioxide (
Catalysts decrease the activation energy for chemical processes.
In the video below
A bamboo skewer is lit on fire using a candle, then blown out. Lowering the still glowing end into the test tube where the reaction is taking place causes the bamboo to start burning again because of the oxygen which is being created by the reaction.
Hope this helps!