oxidation is the loss of electrons reduction is the gain of electrons Balance the half equation for the formation of aluminium during electrolysis: Al 3+ + e-→ Al. The balanced half equation is: ...

In nature, nitrogen is reduced by nitrogenase enzymes, which contain large metalloproteins and promote a sequence of proton-coupled electron-transfer reactions to accomplish the reduction.

Redox, rusting and iron - (CCEA) Oxidation is loss of electrons, gain of oxygen or loss of hydrogen. Reduction is gain ... Reversible reactions - (CCEA) Some chemical reactions are reversible ...