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“克原子”与“克分子”的概念,对于化学过程定量方面的掌握以及依照公式与反应方程式进行计算来说,是相当重要的。为了确切掌握这些概念需要较长的时间。把这些概念教给学生越早,学生就越有可能在以后研究化学的过程中发展与利用它们。据我的工作经验,把“克原子”与“克分子”概念在七年级介绍给学生就已合适。这里,我愿提供大家参考。首先,我教给学生氧单位的概念。在和学生讲话时,我讲明下面一些问题:你知道多少种重量单位?为什么我们在日常生活中要用
The concepts of “gram atoms” and “molecules” are quite important for the mastery of the quantitative aspects of chemical processes and for the calculation according to formulas and reaction equations. It takes a long time to grasp these concepts exactly. The sooner these teachings are taught to students, the more likely students are to develop and utilize them in later chemistry. According to my work experience, it is appropriate to introduce the concept of “gram atom” and “mole molecule” to students in the seventh grade. Here, I would like to provide your reference. First, I teach students the concept of oxygen units. In speaking with the students, I state the following questions: How many weight units do you know and why we use them in our daily life