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化学是以实验为基础的学科。不管是演示实验还是学生分组实验,目的在于培养学生发现问题、分析问题、解决问题的探究能力。教材上的一些探究实验中,明确了实验步骤及注意事项,并且有很多实验有先后顺序,平常授课时教师总是强调学生记忆,但是学生头脑中会产生很多疑问:为什么这么操作?如果不这样,结果会怎样?以下是针对笔者授课中学生产生疑问较多的几个实验,师生共同设计实验进行探究。一、铁丝为何绕成螺旋状?在鲁教版八年级《化学》第四单元第三节“性质活泼
Chemistry is based on experimental discipline. Whether demonstration experiments or student group experiments, the purpose is to cultivate students to discover problems, analyze problems, solve the problem of inquiry ability. Some of the teaching materials on the exploration experiment, a clear experimental steps and precautions, and there are many experiments in the order, the usual teaching teachers always emphasize student memory, but students have a lot of questions in mind: Why do? If not , The results will be what? The following is for the author teaching students have more questions in several experiments, teachers and students to design experiments to explore. First, why the wire wound around a spiral? In eighth edition of the Luban version of ”Chemistry“ fourth unit third ”Lively