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初中生在进行写物质的化学式时,没有或不会运用元素的化合价去衡量所写的化学式是否正确,甚至只是按照物质名称的读音去写化学式.化合价:教材上定义为一种元素一定数目的原予跟其它元素一定数目的原子化合的性质.它是元素在化合物中所表现出来的一种性质,所以我们在书写化学式时,就要根据元素的这个性质去书写.一些教师布置学生熟记常见元素的化合价后,学生在实际运用中又不知怎
When junior high school students write chemical formulas for substances, they do not or will not use the valences of the elements to measure whether the chemical formulas written are correct. They even write chemical formulas according to the pronunciation of the substance name. Valence: A certain number of elements are defined in the textbook. It is a property of a certain number of atoms combined with other elements. It is a property of the element in the compound, so when we write the chemical formula, we must write according to the nature of the element. Some teachers arrange students to memorize After the valence of common elements, students did not know how to use them in practice.