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一、准确领会概念从化学反应的形式来看,复分解反应就是由两种化合物相互交换成分而生成另外两种化合物的反应,可简单表示为:AB+CD=AD+CB,其特点为:(1)两种化合物相互交换成分而生成另外两种化合物;(2)反应前后,各元素的化合价一定保持不变.实验证明,复分解反应常常发生在两种碱、酸、盐及氧化物之间,反应的方向是向着溶液中离子浓度减少的方向进行.
First, the accurate understanding of the concept From the chemical reaction form, the metathesis reaction is generated by the two compounds exchanged with each other and the reaction of the other two compounds can be simply expressed as: AB + CD = AD + CB, which is characterized by :( 1) The two compounds exchange with each other to produce two other compounds; (2) The valence of each element must be constant before and after the reaction, and the experiment shows that metathesis often occurs between two kinds of alkali, acid, salt and oxide , The direction of the reaction is toward the decrease of the ion concentration in the solution.