一、制取氧气 制取氧气是本课教学的重要内容,学生对制氧有极大的兴趣。教学时要充分利用学生的这种心理,使他们通过制氧学到更多的东西。教学分两步进行: 1.引导学生动脑筋,想想怎样控制实验过程才能得到氧气。 “这种物质叫高锰酸钾,平时又叫它灰锰氧。医疗上用它做消毒剂,伤口有腐烂现象,可以用灰锰氧溶液清 First, the system of oxygen to obtain oxygen is an important part of teaching in this class, students have a great interest in oxygen. Teaching should make full use of the students' psychology so that they can learn more through oxygenation. Teaching in two steps: 1. To guide students brains, think about how to control the experimental process in order to get oxygen. "This material is called potassium permanganate, usually called gray manganese oxide. Medical use it as a disinfectant, the wound rot, you can use gray manganese oxygen solution