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中学化学是一门以实验为基础的自然科学,不过,在实验教学过程中,无论是老师的演示实验还是学生实验,有时会出现一些与正常实验结果不相符合的现象.而这些异常现象,会对学生造成认知冲突,要是教师不加以正确的引导,会给学生带来知识的不完整,影响了对化学实验应该具有的严谨的科学态度.在义务教育课程标准实验教科书九年级化学(2006年4月版)中,可能出现的实验异常现象,笔者做了如下的整理.
Chemistry in middle school is an experiment-based natural science, however, in the process of experimental teaching, there are some phenomena that are not in conformity with the normal experimental results, whether it is the teacher’s demonstration experiment or the student experiment .And these anomalies, Will cause cognitive conflict to the student, if the teacher does not give the correct guidance, will bring the incomplete knowledge to the student, has affected the chemistry experiment should have the rigorous scientific attitude.In the compulsory education curriculum standard experiment textbook ninth grader chemistry April 2006 edition), the possible experimental abnormalities, the author made the following finishing.