Flexi Says: The reaction of hydrogen and oxygen to produce water is an example of both a synthesis reaction and a combustion reaction. Mixing the gases together and providing sufficient heat as the activation energy to start the reaction can result in water as product. However, practically it is not that easy to produce water at large scale from reacting H2 and O2. The reaction is highly exothermic and releases enough heat energy to pose high safety risks. The formation of water from hydrogen and oxygen is represented by the chemical equation:
2H2 (g) + O2 (g) --> 2H2O (g)
