Oxidation and reduction reactions These are reactions where electrons are transferred from one species (atom, molecule or ion) to another. We can write 'half' equations to show only what happens to the species losing electrons or a different 'half' equation to show the species gaining electrons. The whole equation is put together by making sure that the numbers of electrons are balanced in each half equation and adding them together (when the electrons will cancel out) Oxidation is a chemical process in which there is a loss of electrons. The species, which gets oxidized becomes more positive or less negative, e.g., Na → Na + + e - (Na is oxidized to Na + ) Fe 2+ → Fe 3+ + e - (Fe 2+ is oxidized to Fe 3+ ) Reduction is a chemical process in which there is a gain of electrons. The species, which gets reduced becomes more negative or less positive, e.g., Cl 2 + 2e - → 2Cl - (Cl 2 is reduced to Cl - ) S + 2e -
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