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书写电子式是中学化学教学的重要内容, 由于书写物质的电子式常常涉及到物质的微观结构及物质的分类等知识,因此它又是中学化学教学中的难点.在此,笔者特将学生在书写电子式中出现的常见错误归纳如下,并对错误原因作了一点粗浅的分析,以供参考. 一、带电符号标写不当 例如将H2S、NaCl的电子式写成: H+[:S:]2+H+ Na:Cl: 错误原因:不能准确识别化学键的类型以及对带电符号的使用范围模糊. 上述电子式正确书写应为:
Writing electronic is an important part of chemistry teaching in middle schools. Since the electronic form of writing materials often involves the knowledge of the microscopic structure of matter and the classification of matter, it is also a difficult point in chemistry teaching in middle schools. Here, the author specializes students in The common mistakes in the writing of electronic writing are summarized as follows, and a bit of shallow analysis of the cause of the error is provided for reference. First, the improper marking of live symbols such as H2S, NaCl is written electronically: H+[:S:]2 +H+ Na:Cl: Cause: The type of chemical bond cannot be accurately identified and the range of use of the charged symbol is blurred. The above electronic correct writing should be: