In the narrowest sense, oxidation refers to a substance combining with oxygen, and reduction refers to an oxide losing oxygen. For example, when copper (Cu) is heated in air, it undergoes the reaction 2Cu + O 2 -- → 2CuO to become copper oxide (CuO). At this point, copper is said to be oxidized. When copper oxide is heated in hydrogen, the reaction occurs CuO + H 2 -- → Cu + H 2 O, and copper oxide loses oxygen, isolating copper. This is said to be copper being reduced. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
狭義の定義として,物質が酸素と結合することを酸化oxidationといい,酸化物が酸素を失うことを還元reductionという。たとえば,銅Cuを空気中で加熱すると, 2Cu+O2―→2CuOの反応をして酸化銅CuOとなる。ここで,銅は酸化されたという。また,酸化銅を水素中で加熱すると, CuO+H2―→Cu+H2Oの反応を起こして,酸化銅は酸素を失って銅を単離する。これを銅が還元されたといっている。
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