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近年来出现在中考题中、竞赛题中及有关化学刊物上的一些计算题,除用常规解法外,还可根据题目特点进行巧算。这样既简化了解题步骤和数学运算,也提高了解题速度和正确性。特别是目前,学生手里的试题多种多样,在学生感到无所适从的情况下,更应该发挥教师的主导作用,传授解题技巧。笔者在初中化学计算题的教学中,常用的解题技巧有以下几种。
In recent years, some calculation problems appear in the examination questions, competition questions and related chemical journals. In addition to conventional solutions, they can be calculated according to the characteristics of the questions. This not only simplifies problem solving steps and mathematical operations, but also improves the speed and correctness of the problem. In particular, at present, students have a variety of test questions. When students feel at a loss, they should give full play to the leading role of teachers and teach them problem-solving skills. In the teaching of junior high school chemistry calculations, the author uses the following techniques to solve problems.