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“质量守恒定律”设置在人教版《化学》全一册的第四章第一节，它研究物质之间相互反应所遵循的量的规律。课本设计，在启发学生发现“参加化学反应的各物质质量总和等于反应后生成各物质的质量总和”时，设置一个实验：氢氧化钠与硫酸铜溶液的反应：２NaOH＋CuSO４＝Cu（OH）
The “law of conservation of masses” is set in the first section of the fourth chapter of the book “Chemistry” of the People’s Education Press. It examines the laws of the quantities that substances follow each other. Textbook design, inspiring students to discover 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”, set up an experiment: Reaction of sodium hydroxide and copper sulfate solution: 2NaOH + CuSO4 = Cu(OH)