质量守恒定律是初中化学学习中的重点内容,是支撑化学体系的重要理论之一,也是历年来中考命题的热点.命题者总是从不同的角度,以不同的形式来考查学生对质量守恒定律的理解,推断物质的组成,确定物质的化学式等.现对质量守恒定律在中考中的应用作如下归纳. The law of conservation of mass is a key part of junior middle school chemistry learning. It is one of the important theories supporting the chemical system. It is also a hot point of the proposition of the middle school entrance examination over the years. Propositioners always look at the law of conservation of mass in different ways from different perspectives. Understanding, deducing the composition of the substance, determining the chemical formula of the substance, etc. Now the application of the law of conservation of mass in the examination is summarized as follows.