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经过对这几年全国新课标高考试题的对比与分析,化学计算在高考中的比例由原来的10%~15%变为2013年高达20%左右,可以看到高考试题这几年对计算题的考查力度明显增加,但从学生的答题实际的情况看,计算题的得分率并不高。究其主要原因是学生缺少正确的计算方法和计巧,下面笔者根据近几年的教学情况,来谈谈化学计算中的常用方法和计巧。
After several years of the National New Curriculum exam comparison and analysis of college entrance examination, chemical calculation in the college entrance examination in the proportion of 10% ~ 15% to 2013 up to about 20%, you can see the college entrance examination papers in recent years on the calculation Examination of the problem significantly increased, but from the student’s answer to the actual situation, the calculation of the scoring rate is not high. The main reason is that students lack the correct calculation methods and skills, the author following the recent years of teaching, to talk about the common methods of chemical calculation and calculation skills.