一、教材中实验的作用及不足作用:化学爆炸是在燃烧的基础上形成的。学生已知燃烧的条件,教材中安排该实验是想让学生理解爆炸是可燃性气体在有限的空间内燃烧并达到爆炸极限后产生的。不足:教材中的实验无法直观、定量地显示混合气体的比例,学生会误认为只要氢气与空气或氧气以任意 First, the role of teaching materials and deficiencies in the role of: chemical explosion is formed on the basis of combustion. Students know the conditions of combustion and the textbook is arranged to allow the student to understand that the explosion was created when the flammable gas burned in a confined space and reached the limit of explosion. Insufficient: Experimental teaching materials can not be intuitive, quantitative display of the proportion of gas mixture, students will mistakenly believe that as long as the hydrogen and air or oxygen to any