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对于化学反应的分类方法有很多,初中从得失氧的角度把化学反应分为氧化反应和还原反应,但是到了高中这是不科学的,因为对于一个反应有氧化就有还原,既统一又对立。氧化还原反应也不一定有氧的得失,比如说钠在氯气中燃烧生成氯化钠,虽没氧的得失但属于氧化还原反应,所以研究氧化还原反应要抓住反应实质,即电子的转移。电子转移的实质是元素化合价的变化,所以研究氧化还原反应可以归为研究元素化合价,我们可以把所学的内容与元素化合
There are many classification methods for chemical reactions. In junior high school, chemical reactions are divided into oxidation reactions and reduction reactions from the point of view of oxygen loss. However, it is unscientific to go to high schools because there is reduction of oxidation for one reaction, which is unification and opposition. Redox reaction is not necessarily the gains and losses of oxygen, for example, sodium chloride combustion in the formation of sodium chloride, though not the pros and cons of oxygen but belong to the redox reaction, so the redox reaction to grasp the substance of the reaction, that is, electron transfer. The essence of electron transfer is the change of elemental valence, so the study of redox reaction can be attributed to the study of elemental valence, and we can combine what we have learned with elements