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化学实验的现象鲜明生动,容易激起学生的学习兴趣.在实验时教师如何引导学生有目的地观察,积极地进行思维.重要的一条.是要善于设疑,要把问题提得准,提得好,使学生始终处于有效的积极思索状态。我们认为在实验时设疑需注意下列几点:1、提的问题要准确,要有层次。准确就是要紧扣实验内容,注意理论联系实际.有层次可使学生由浅入深,由表及里地去思考问题,以符合学生的认识规律.如:“铁在氧气里燃烧”这一实验,
The phenomenon of chemical experiments vivid and vivid, easy to arouse the interest of students in learning .In the experiment, teachers how to guide students to observe purposefully, and actively thinking .One important thing is to be good at suspecting the question, the question should be quasi-mention Well, so that students are always in a valid positive thinking state. In our opinion, we should pay attention to the following points in the experiment: 1. The questions raised should be accurate and have a level. Accurate is to closely test the content, pay attention to the theory with practice .Level can make students from shallow to deep, from the table and to think about the problem, in line with the law of cognition of students such as: “iron in the oxygen combustion” experiment ,