质量守恒定律是一个客观存在的规律,为学生提供理解化学变化的依据,更是学生从对化学反应定性认识开始到定量认识反应的转折点,引导学生从直觉的观察到深刻的理性思考,在初中化学解题中有着广泛的应用. The law of conservation of mass is an objective law that provides students with a basis for understanding chemical changes. It is also a turning point from students’ understanding of chemical reactions to quantitative cognition. Students are guided from intuition to profound rational thinking. Chemical problems have a wide range of applications.