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离子反应方程式的书写在高中化学的教学中既是重点又是难点。初学时要重点练习有难溶物质、气体产生和有水生成的离子反应方程式。随着化学知识的不断积累和深入,应着重练习有弱电解质参加的反应。判断离子反应方程式是否正确应主要学会四查:(1)查难溶物质、难电离物质(弱酸,弱碱、水及配离子)及气体的书写是否正确;(2)查两边各种元素的原子个数是否相等;(3)查两边的电荷数是否相等;(4)查氧化-还原反应中得失电子数是否相等。 近几年在一些试题中,经常出现一些与反应物用量有关的离子反应方程式,书写的基本
The writing of the ion reaction equation is both a focus and a difficulty in the teaching of high school chemistry. Beginners should focus on practicing the ion reaction equations for insoluble substances, gas production, and water production. With the continuous accumulation and deepening of chemical knowledge, we should focus on practicing the participation of weak electrolytes. Judging whether the ion reaction equation is correct or not should be based on four main investigations: (1) Checking whether insoluble substances, difficult ionized substances (weak acids, weak bases, water and complex ions) and gases are written correctly; (2) Check the various elements on both sides Whether the number of atoms is equal; (3) Check whether the charge numbers of the two sides are equal; (4) Check whether the number of gain and loss electrons in the oxidation-reduction reaction is equal. In some questions in recent years, some ion reaction equations related to the amount of reactants often appear.