元素化合物知识贯穿于整个初中化学教材的始末。从内容上看,这部分知识约占初中化学的三分之一。长期以来,学生们普遍反映元素化合物知识“量多、分散,变化、万千,独立性的知识多于规律性的知识,机械记忆多于理解记忆,知识的逻辑关系不如数学、物理那么严密等 The knowledge of elemental compounds runs through the entire junior high school chemistry textbook. In terms of content, this part of knowledge accounts for about one-third of junior high school chemistry. For a long time, students generally reflect the knowledge of elemental compounds "more, scattered, changing, thousands of, more knowledge of independence than regular knowledge, mechanical memory more than understanding memory, the logical relationship of knowledge as mathematics, physics so tight