在粮食中专和职业中专的《粮油化学》课程中,都有离子方面的教授内容,如什么是离子?离子是带有电荷的吗?离子又怎样地自由移动?等等,一系列基础知识,在中专和高中是教学重点,又是难点。过去教师在处理这些教材内容时,往往是通过在课堂上的讲解和黑板上书写离子的方程式,来引导学生相信和树立这些新概念。靠这种单一的讲述方法,要使学生掌握新的知识,学会贯通,是有困难的,特别是初学者。实际上,离子和离子的移动是确实存在的,这种自然界客观存在的物质及其运动,为什么我们的学生看不见、摸不着呢?关键问题是教 In the course of “grain and oil chemistry” in food specialties and vocational secondary schools, there are professors in the field of ionization, such as what is ion? Is ion charged? How does ion move freely? etc. Knowledge is a focus of teaching in secondary schools and high schools, but also difficult. In the past, when teachers were dealing with the contents of these teaching materials, they often guided students to believe and establish these new concepts through lectures in the classroom and equations written on the blackboard. With this single approach, it is difficult for students to master new knowledge and learn to work together, especially for beginners. In fact, the movement of ions and ions does exist. This kind of objectively existing matter and its movement in the natural world are invisible and intangible to our students. The key issue is to teach