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质量守恒定律是初中化学中的重要定律,是各省市历年来中考的热点.对质量守恒定律的理解和应用要把握住三个“守恒”:元素守恒(元素的种类不变),原子守恒(原子的种类和数目、质量不变)、质量守恒(参加反应的各物质的质量总和等于反应生成的各物质的质量总和).下面把近年来各地考查质量守恒定律的
The law of conservation of mass is an important law in junior middle school chemistry. It is a hot spot in provincial and municipal examinations over the years. The understanding and application of the law of conservation of mass must grasp three “conservation”: the conservation of the element (the type of element is not changed), the atom Conservation (the type and number of atoms, the quality of the same), the conservation of mass (the sum of the mass of each substance participating in the reaction is equal to the sum of the masses of the substances produced by the reaction). The following has examined the law of conservation of mass in recent years.