离子方程式及其书写原则浅析江苏省丹阳中学李霖离子反应和离子方程式的书写是中学化学教学的难点，如何将这一教学难点化难为易，笔者抓住了一个“关键”和三个“守恒”进行教学，使学生既理解了离子方程式的概念，又牢固掌握了离子方程式的书写原则，收到了良好的教学效... Ion equation and its writing principle Analysis of Li Yang, Danyang Middle School, Jiangsu Province The writing of ion reactions and ion equations is a difficulty in chemistry teaching in middle schools. How to make this teaching difficult is difficult. The author has grasped a “key” and three “ ”Conservation" teaches students so that they not only understand the concept of ion equations, but also firmly grasp the writing principle of ion equations. They have received good teaching effects...