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题目:置换反应的通式可以表示为:单质(1)+化合物(1)=化合物(2)+单质(2)请写出满足以下要求的3个置换反应的化学方程式:①所涉及的元素的原子序数都小于20;②6种单质分属6个不同的主族。解析:此题是一道有附加条件的关于置换反应的试题,试题针对元素周期表前20号元素中分属不同主族的元素的单质与化合物间发生置换反应的问题进行考查。虽然置换反应对考生而言司空见惯,平日练习得也多,但实际考试中却漏洞百出。笔者将从高考阅卷中看到的错误筛选如下:
Title: The general formula for the displacement reaction can be expressed as follows: Elemental (1) + Compound (1) = Compound (2) + Elemental (2) Please write down the chemical formula of the three substitution reactions that satisfy the following requirements: Of the atomic number is less than 20; 6 kinds of elements belonging to 6 different main group. Analysis: This question is an additional condition on the replacement reaction test questions for the first 20 elements of the periodic table element belongs to different main elements of the elemental and chemical substitution reaction between the problem to examine. Although the permutation reaction is commonplace for candidates, there are also more routine exercises, but the actual examination is full of loopholes. The author will see the mistakes from the entrance examination screened as follows: