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为使初中化学教学进一步提高教学质量,适当的增删与调整教材的某些内容是十分必要的。几年来,我們的教学实践表明,改进与提高“化合价”的教学尤为重要。为什么要改进化合价的教学呢?理由如下: 1.为使学生掌握“当量浓度”在科学研究和工农业生产上的广泛应用,在新編“初級中学課本化学补充教材”中增加了“当量”,要使学生学会求化合物的当量,就必须具有正、负化合价的概念,而在原課本中根本沒有提到正、负化合价。
In order to further improve teaching quality in junior high school chemistry teaching, it is very necessary to add, delete and adjust certain teaching materials appropriately. In recent years, our teaching practice shows that it is especially important to improve and enhance teaching of “valence”. Why do we need to improve the teaching of valence? The reasons are as follows: 1. In order to make students master the widespread application of “equivalent concentration” in scientific research and industrial and agricultural production, “equivalence” has been added to the newly revised textbook for junior high school textbooks, To enable students to learn equivalent compound, it must have the concept of positive and negative valence, and in the original textbook did not mention the positive and negative valence.