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关于金属和盐溶液的反应,一直是初中化学教学的重点和难点内容之一.笔者在平时的教学中发现关于金属和盐溶液反应的很多题目,可以从定性和定量两个角度去考虑.一、从定性的角度分析例1把金属X放入Ag NO3溶液中,X表面有银白色固体析出;若放入Fe SO4溶液中,无明显现象.则X、Ag、Fe三种金属活动性由强到弱的顺序正确的是()(A)Fe、X、Ag(B)X、Fe、Ag(C)Fe、Ag、X(D)Ag、X、Fe解析:通过阅读题目找出本题中属于定性的信息:(1)X表面有银白色固体析出(2)无明显现象,抓住这些属于定性的信
The reaction of metal and salt solution has always been one of the most important and difficult problems in chemistry teaching of junior middle school.I found many questions about the reaction between metal and salt solution in normal teaching, which can be considered qualitatively and quantitatively. , From a qualitative point of view Example 1 put the metal X into the solution of Ag NO3, X silver white solid surface precipitation; if into the Fe SO4 solution, no obvious phenomenon. X, Ag, Fe three metal activity from Strong to weak order is correct () (A) Fe, X, Ag (B) X, Fe, Ag (C) Fe, Ag, X Belongs to the qualitative information: (1) X surface silver white solid precipitation (2) no obvious phenomenon, to seize these are qualitative letter