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我们学过在实验室中制氧气的两个化学反应:一是氯酸钾在有二氧化锰作催化剂时的加热分解,二是高锰酸钾直接加热分解。根据这两个化学方程式的计算题类型,是初学根据化学方程式的计算时易遇到的一类难度较大的习题,这类计算题综合性较强,所应用到的知识点一般有: 1.质量守恒定律。这两个反应都是固体加热制气体的反应,并同时生成其它固体,所以反应前后试管内固体质量的改变量即为反应时生成的氧气的质量。
We have studied two chemical reactions that produce oxygen in the laboratory: one is the thermal decomposition of potassium chlorate in the presence of manganese dioxide as a catalyst, and the other is the direct thermal decomposition of potassium permanganate. The calculation of the problem types based on these two chemical equations is a difficult type of problem that is easily encountered by beginners based on the calculation of chemical equations. Such calculation problems are more comprehensive and the applied knowledge points are generally: .Conservation of mass. Both of these reactions are reactions of solid heating gases and generate other solids at the same time. Therefore, the amount of solids in the tubes before and after the reaction is the amount of oxygen produced during the reaction.