初中化学方程式的计算,教材在第一章第八节已开始奠定基础——提出了反应物和生成物之间的质量比问题。第二章第八节正式提出。在第四章第三节习题中又提出反应物之一过量的问题,一步一步地加深扩大。为了增强练习的系统性,更好地巩固、扩大新知,培养技能,我建议将习题作如下的处理。 The calculation of the chemical equations for junior high schools has begun to lay the foundation for the teaching materials in the eighth chapter of Chapter One - the question of the mass ratio between reactants and products has been raised. Chapter VIII is formally proposed. In the fourth chapter of the third section of the exercise, the question of excessive quantities of one of the reactants was raised, stepping up and expanding step by step. In order to enhance the systematicness of the exercises, to better consolidate, expand new knowledge, and develop skills, I suggest dealing with the exercises as follows.