"Hydrogen combines with oxygen with great vigor. A stream of hydrogen when ignited burns in oxygen or air with a very hot, almost colorless flame (Figure 6-8), and a mixture of hydrogen and oxygen when ignited explodes with great violence. When hydrogen burns in air or oxygen, forming hydrogen oxide (water), the hydrogen is said to have been oxidized. The process is called oxidation, and oxygen is called the oxidizing agent. The tendency of hydrogen to combine with oxygen to form water is so great that the gas will even remove oxygen from many metallic oxides. Thus when a stream of hydrogen is passed over hot copper oxide, CuO, in a heated tube, the copper oxide is converted into metallic copper (Figure 6-9):CuO + H2 → Cu + H2O This reaction is described as the reduction of copper oxide by hydrogen. Hydrogen is called the reducing agent in the reaction. Copper oxide is said to have been reduced to metallic copper. In the reaction of hydrogen and copper oxide the copper oxide is the oxidizing agent. In every reaction of this sort there is a reducing agent which is oxidized and an oxidizing agent which is reduced."
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Linus Pauling (1957), College Chemistry (2nd ed.), Chapter 6. Hydrogen and Oxygen, p. 109-111
https://en.wikiquote.org/wiki/Redox
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