高中化学知识是在初中化学知识的基础上进行了拓展和延伸、深化和内化。因此初高中有很多相通和关联的知识点,而这部分知识点往往就成为中考命题者的命题热点。 High school chemistry knowledge is based on the knowledge of junior high school chemistry to expand and extend, deepen and internalize. Therefore, there are many connected and related knowledge points in the junior high school, and this part of the knowledge point often becomes the proposition hot topic of the proposition tester.