(chemistry only) (HT only) Link hydrogen fuel cell half equations to the overall production of water.

In a hydrogen fuel cell, hydrogen gas is oxidized at the anode, releasing electrons and forming protons. The half equation for this reaction is: 2H₂ → 4H⁺ + 4e⁻. At the cathode, oxygen gas reacts with the protons and electrons to form water, represented by the half equation: O₂ + 4H⁺ + 4e⁻ → 2H₂O. When these half equations are combined, they illustrate the overall reaction in the fuel cell, which produces water as the main product. This process highlights the efficiency of hydrogen fuel cells in generating electricity while only producing water as a byproduct.