There are at least two possibillities: Glucose C6H12O6 --> 2C3H6O3 (pyruvic acid) Glucose C6H12O6 --> 2C2H5OH + 2 CO2 (ethanol or alcohol and carbon dioxide)
Water (H2O) is a molecule with 2 hydrogen atoms and 1 oxygen atom attached by chemical bonds. If we put two electrodes in pure water and apply a DC voltage, the voltage will supply the energy...
Any molecule that contains both hydrogen and oxygen can be split into its component parts. Simple H2O, water, is the simplest. H2O2, hydrogen peroxide, is another example.