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化学是一门以实验为基础的科学。化学实验在化学教学中占有十分重要的地位,所以化学演示实验在化学教学中就显得非常必要。那么怎样才能作好课堂演示实验呢?这里借贵刊一角谈谈我在教育实习中,讲到高中化学第二册电镀这一节所演示的在铜片上镀镍实验的体会,供从事中学化学教学的老师们参考。1、实验目的:1)通过电镀实验的演示,使学生掌握电镀是电解原理的应用。2)通过电镀实验的演示,使学生明确电镀时,阳极参加了电极反应。即电镀时阳极金属逐渐溶解。2、实验原理:
Chemistry is an experiment-based science. Chemical experiment occupies a very important position in chemistry teaching, so chemistry demonstration experiment is very necessary in chemistry teaching. So how can we make a classroom demonstration experiment? Here, from the corner of your magazine, I talked about my experience in the teaching of nickel plating on copper plates in the second edition of the chemistry of high school chemistry in my teaching practice. Teaching teachers have a reference. 1, the experimental purpose: 1) through the demonstration of electroplating experiments, so that students master electroplating is the application of electrolysis principle. 2) Through the demonstration of the electroplating experiment, the anode is clearly electrodeposited when the student participates in the electrode reaction. That is, the anode metal gradually dissolves during electroplating. 2, the experimental principle: