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在高中化学电解质溶液一章的教学中,教师总要向学生讲解:电解质在水分子的作用下能够离解成自由移动的离子,离子是带有电荷的原子或原子团,在电场的作用下做定向移动;各种阴、阳离子在电极上按一定顺序放电等等。但是,离子这种微观的粒子,人们摸不着,看不见,它的存在以及在电场中如何运动,各种阴、阳离子在电极上如何按顺序放电,这些问题常常引起学生的怀疑。为了帮助学生揭示微观粒子的运动规律,使微观粒子的运动宏观化,使抽象的概念具体化,我们研究制做了一套演示教具,经几年来的教学实践验证,效果良好。一、教具的用途
In the teaching of high school chemical electrolyte solutions, teachers always explain to students that electrolytes can dissociate into free-moving ions under the action of water molecules. Ions are charged atoms or atomic groups, and they are oriented by the electric field. Mobile; various negative and positive ions are discharged on the electrode in a certain order and so on. However, ions such microscopic particles, people can not touch, can not see, its existence and how to move in the electric field, how the various cathode, cation discharge in order on the electrode, these problems often aroused students’ suspicion. In order to help students reveal the law of movement of microscopic particles, to macroscopicize the movement of microscopic particles and to make the abstract concept concrete, we have made a set of demonstration teaching aids. After a few years of teaching practice, we have achieved good results. First, the use of teaching aids