一、问题情境在对人教版新课程教材“铁化合物和亚铁化合物的互相转化”这个知识点的教学过程中,我们采用了让学生分组进行探究实验的学习方式。其中一组学生设计的“Fe2+转变成Fe3+并验证Fe2+的存在”的探究实验方案如下:1.用过量的铁粉和稀盐酸溶液反应制备FeCl2溶液。2.取新制备的FeCl2溶液5ml置于一支试管中,然后向试管 First, the problem situation In the PEP teaching material “iron and iron compounds and ferrous compounds mutual transformation ” This point of knowledge teaching process, we used to allow students to study in groups study. One group of students designed “Fe2 + into Fe3 + and verify the existence of Fe2 + ” The experimental program is as follows: 1. Excess iron powder and dilute hydrochloric acid solution was prepared FeCl2 solution. 2. Take freshly prepared FeCl2 solution 5ml placed in a test tube, and then to the test tube