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熟习各种分子式、方程式并运用它进行计算是学习化学的一个重要环节。尤其对于初学者来说,它更是学好化学课的一个重要关键,也是化学教师的一个重要而艰巨的任务。现在把我进行这项工作的一些不成熟的方法和经验作为引玉之砖简单介绍出来,供大家参考指正。甲、化学元素符号的掌握——这是运用符号的第一步工作,必须从这里开始下工夫才是一个根本办法。 1.在讲述分解作用、化合作用、置换作用各节中,利用画圆圈来解释化学反应的过程时,就简单介绍一下这种方法要比用文字叙述要来得更具体、简单、而明瞭,并指出不易记忆和辨认的缺点,给讲国际共用的化学符号打下基础。 2.讲授化学符号和分子式这一节时,我认为为了打好基础教学进度要慢一些,尤其学生认识拉
Being familiar with various formulas and equations and using it for calculation is an important part of learning chemistry. Especially for beginners, it is an important key to learning chemistry and an important and arduous task for chemistry teachers. Now I introduce some immature methods and experiences that I carry out this work as a guide to the bricks, for your reference. A, mastery of chemical element symbols - this is the first step in the use of symbols, work must be started here is a fundamental solution. 1. Explain the process of chemical reaction in the sections on decomposition, compounding, and substitution, simply introducing the method to be more specific, simple and clear than the narrative, And points out the shortcomings that are not easy to remember and identify, and lays the foundation for international common chemical symbols. 2. Teaching Chemical Symbols and Formulas This section, I think in order to lay a good foundation for teaching progress slower, in particular, students recognize pull