化学是一门以实验为基础、与劳动生产实际密切结合的自然学科。化学的基本概念大都来源于实验，其理论的验证和确立也有赖于实验，可以说化学实验是教师教学的有力措施，是学生理解抽象概念、掌握基本理论、消化书本知识的有效方法。所以做好化学实验，对于培养学生的观察... Chemistry is a natural science that is based on experiments and closely integrated with the actual production of labor. Most of the basic concepts of chemistry come from experiments. The verification and establishment of its theory also depends on experiments. It can be said that chemistry experiments are powerful measures for teachers’ teaching and they are effective methods for students to understand abstract concepts, master basic theories, and digest book knowledge. So do a good chemical experiment to train students to observe...