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化合价是九年义务教育初中化学教材的知识点之一,这是一个重要的化学概念,教学大纲要求“了解化合价的涵义,能根据化合价写出化学式,或能根据化学式判断化合价”。与化合价直接关联的重点知识是化学式。此外,与其相关的知识在初中还有原子结构、离子结构、分子形成等,在高中还涉及物质性质(氧化性与还原性)、氧化还原配平等。1 化合价及化合价“法则” 关于化合价,教材中定义为:“我们把一种元素一定数目的原子跟其它元素一定数目的原子化合的性质,叫做这种元素的化合价。”这一定义比较抽象。
Valuable price is one of the knowledge points of junior high school chemistry textbooks for nine-year compulsory education. This is an important chemical concept. The syllabus requires that “understand the meaning of valence, write chemical formulas based on valence, or judge valence based on chemical formulas”. The key knowledge directly related to valence is chemical formula. In addition, related knowledge also includes atomic structure, ion structure, and molecular formation in junior high school, and physical properties (oxidation and reduction) and redox equality in high schools. 1 valence and valence “law” Regarding valence, the teaching material is defined as: “We call a certain number of atoms of one element in combination with a certain number of atoms of other elements, called the valence of this element.” This definition is more abstract.