初中化学教学大纲,对初中化学的知识要求分为四个层次:掌握、理解、了解、常识性介绍,并附有一部分选学内容。对此还有一个专门的说明指出:“常识性介绍内容与基础知识、日常生活和工农业生产或现代科学技术有密切关系.不可忽视”。这部分内容不但涉及面广,而且许多是我们身边真实存在的,它与高中化学的衔接也是很紧密的。讲好这些内容可更好地体现 Junior high school chemistry syllabus, junior high school chemistry knowledge requirements are divided into four levels: master, understanding, understanding, common sense introduction, with a part of the elective content. There is also a special note on this: “Common sense introduction content and basic knowledge, daily life and industrial and agricultural production or modern science and technology are closely related. Can not be ignored.” This part of the content not only covers a wide range, but many of our real existence, and its convergence with high school chemistry is also very close. Speaking of these elements can be better reflected