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中学阶段,学生必须掌握一些物质(或离子)简单的定性方法,这本是实验实习方面的知识,但学生对鉴定和鉴别物质这类问题的书面解题,常常出现条理不清、科学性不强和步骤顺序混乱等严重错误。究其原因,是学生缺乏分析综合能力和逻辑推理素养。因此根据教学实践,可从下述几个方面的内容,通过分析综合,归纳总结,给学生以概括而系统的规律性知识,再经过一些练习,养成学生解题的科学性、条理化和规范化。
At the middle school level, students must master some simple qualitative methods of matter (or ion). This is the knowledge of experimental practice. However, students often have problems with written questions in the identification and identification of substances, and are often unclear and scientific. Strong and messy order and other serious errors. The reason is that students lack analytical abilities and logical reasoning literacy. Therefore, according to the teaching practice, we can summarize, summarize, give students general knowledge, and systematic knowledge of the law from the following aspects, and then through some exercises, develop students’ scientific and logical questions. Standardized.