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在初中化学知识中,有一条很重要的定律,就是质量守恒定律。其概念为:参加化学反应的各物质的质量总和等于反应后生成的各物质的质量总和。要在实际题目中能对质量守恒定律运用自如,必须对这一概念有深刻的理解。 从宏观角度理解 在化学反应前后,物质发生了改变(即有新物质生成);而组成物质的元素种类始终不变。 从微观角度理解 在化学反应前后,分
In the chemistry of junior high school, there is a very important law that is the law of conservation of mass. The concept is that the sum of the mass of each substance participating in the chemical reaction is equal to the sum of the mass of each substance produced after the reaction. In order to be able to apply the law of conservation of mass in practical subjects, it is necessary to have a deep understanding of this concept. From a macro perspective, before and after the chemical reaction, the substance has changed (ie, new substances have been generated); the types of elements that make up the substance remain unchanged. Understanding from the microscopic point before and after the chemical reaction