在初中阶段,化学是一门启蒙学科.因此,初中化学知识主要是常识性介绍,没有形成一个完整的知识体系,知识结构上以物质的分类为主干,即每一部分知识只介绍其中的一个点或很少一部分,知识之间的联系较少.而高中化学知识则以物质的结构、物质的量、化学反应中的能量变化、氧化还原反应、化学反应速率、离子反应、元素周期律的理论为主干,从初中所 In junior high school, chemistry is an enlightenment subject. Therefore, the junior middle school chemistry knowledge is mainly a common sense introduction. It does not form a complete knowledge system. The knowledge structure is based on the classification of matter, that is, each part of knowledge only introduces one of the points. Or, in a few parts, there is less connection between knowledge. The chemical knowledge in high schools is based on the structure of matter, the amount of matter, the energy change in chemical reactions, the redox reaction, the rate of chemical reaction, the ion reaction, and the theory of the periodicity of the elements. Mainstay, from junior high school