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本考点是中考的必考知识点,考查的知识有:化学变化(包含物质的性质与用途、催化剂等知识)、基本反应类型(包含复分解反应的条件等)、金属活动性顺序、质量守恒定律、化学方程式及其计算.一、认识几种化学反应例1(1)(2012年盐城)金属R与Cu Cl2溶液反应的化学方程式为:R+Cu Cl2=RCl2+Cu,则下列说法错误的是()(A)该反应是置换反应(B)金属R可能是铝(C)金属R活动性比Cu强(D)该反应前后R的化合价发生了改变(2)(2012年绵阳)王腾同学以不同的化学思维方式或者
This test site is an indispensable examination point for the examination. The knowledge to be examined includes chemical changes (including substance properties and uses, catalysts, and other knowledge), basic reaction types (including conditions for metathesis reactions, etc.), sequence of metal activity, and law of conservation of mass. , chemical equations and their calculations. First, to understand several chemical reactions Example 1 (1) (Yancheng, 2012) The chemical equation for the reaction of metal R and Cu Cl2 solution is: R + Cu Cl2 = RCl2 + Cu, then the following statement is wrong Yes () (A) The reaction is a displacement reaction (B) Metal R may be aluminum (C) Metal R is more active than Cu (D) The valence of R changes before and after the reaction (2) (Mianyang, 2012) Wang Teng classmates use different chemical thinking or