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一、化学式计算教学特点分析化学计算是对化学概念、理论、实验等有关知识的量的理解,是初中化学学习的重要组成部分。而依据化学式开展的化合物中元素质量分数的计算,则是九年级化学学习的重点和难点内容。化学式计算的学习,如果学生不能从分子和原子层次上认识化学式,不能理解质量分数等概念的话,只是在进行机械模仿操作,一旦问题情境改变则会束手无策,错误百出。因此,从概念教学入手,促使学生从量的角度来理解和深化化学概念,掌握化合物中
First, the analysis of chemical formula teaching analysis Chemical calculation is the concept of chemistry, theory, experiments and other related knowledge of the amount of understanding, is an important part of junior high school chemistry learning. However, the calculation of the mass fraction of elements in the compounds according to the chemical formula is the key and difficult content of the ninth grade chemistry study. Chemical calculation of learning, if students can not understand the chemical formula at the molecular and atomic levels, can not understand the concept of mass fraction, then only in the mechanical simulation, once the situation changes will be helpless, mistakes. Therefore, starting from the concept of teaching, prompting students to understand and deepen the concept of chemistry from the perspective of the amount of compounds