所谓“五环”指在探究实验教学中,按“提出问题”“做出猜想”“设计实验”“动手操作”“得出结论并总结”这五个环节进行教学。下面以学生探索性实验“二氧化碳遇紫色石蕊试液变红原因的探究”一课为例,谈谈“五环式探究实验”教学模式的操作与实施。一、提出问题教师在实验课一开始,创设教学情境:将CO_2气体通入盛有紫色石蕊试液的试管中,溶液变红。使石蕊试液变红的是什么物质? The so-called “Rings ” refers to the inquiry experiment teaching, according to “ask questions ” “make a guess ” “design experiment ” “hands-on operation ” “draw conclusions and summarize ” Five links for teaching. The following students to exploratory experiment “Carbon Dioxide purple Litmus test fluid reddy ” lesson as an example, talk about “five-ring exploration experiment ” teaching mode of operation and implementation. First, ask questions Teacher at the beginning of the experiment, the creation of teaching situations: the CO 2 gas into the test tube containing purple litmus solution, the solution turns red. Litmish test solution is what kind of material?