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在高中一年级“化学基本概念和基本定律”这一章教学中,“克原子、克分子”对学生来说是一个陌生的概念。同时又比较抽象。如果我们不能抓住关键问题进行教学,学生就很难接受。即便当时能听懂,以后在实际应用中,还会发生问题。例如过去有的学生把“1克原子氧”当成是1克重的氧原子:认为32克氧和2克氢中含有不同数目的分子。这就说明概念掌握的不够牢固。在这一次讲授时,经过对教材进一步的分析,以及教学的实践,体会到在“克原子、克分子”的教学中,必须抓住两个关键问题。一、使学生树立清楚明确的“克原子”(克
In the first year of high school “basic concepts of chemistry and the basic law” in this chapter teaching, “grams of atoms, gram” is a strange concept for students. At the same time more abstract. If we can not grasp the key issues of teaching, students will find it hard to accept. Even at that time can understand, after the actual application, there will be problems. For example, in the past some students regarded “1 gram of atomic oxygen” as one gram of oxygen atoms: 32 grams of oxygen and 2 grams of hydrogen were considered to contain different numbers of molecules. This shows that the concept of control is not strong enough. During this lecture, through further analysis of teaching materials and teaching practice, I realized that we must grasp two key issues in the teaching of “gram atom and grammar.” First, to enable students to establish a clear and clear “gram atom” (grams