When it is, an electrochemical reaction takes place between the hydrogen and oxygen that directly converts chemical energy into electrical energy. Various types of fuel cells exist, but the one ...

work in a different way than chemical cells. Fuel cells produce a potential difference continuously, as long as they are supplied with: In a hydrogen-oxygen fuel cell, hydrogen and oxygen are used ...

When yeast was added to hydrogen peroxide, a chemical in the yeast causes a reaction in which the hydrogen peroxide breaks apart to form oxygen gas and water. The oxygen was in the bubbles you saw.

The reactions of this stage ... by chlorophyll is converted into chemical energy. Some of this energy is used to split water into hydrogen and oxygen. Hydrogen and ATP are both transferred to ...