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化学计算题中,有一类判断型计算题,它的解答思路是:分析—判断—计算。要正确解答这类题目,不但要求学生有系统扎实的基础知识,而且要求学生有灵活运用知识、善于从多角度去分析问题和解决问题的能力。所以,判断型计算题的难度较大。学生在解这类题目时,往往感到无从下手。但这类题目也是有规律可循的,解答关键是通过分析首先作出判断。下面就其需要判断的内容作以归类并举例分析。
Among chemical calculation questions, there is one type of judgment-type calculation problem. Its solution ideas are: analysis-judgment-calculation. Correctly answering such questions not only requires students to have systematic and solid basic knowledge, but also requires students to have the ability to use knowledge flexibly and be good at analyzing problems and solving problems from multiple angles. Therefore, it is more difficult for a judgment-type calculation problem. When students solve such problems, they often feel that they have no way to start. However, this type of problem is also subject to regularity. The key to the solution is to make judgments first through analysis. The content of what needs to be judged below is categorized and analyzed by examples.