化学实验是中学化学教学中使学生获得知识、技能和发展能力的重要手段。但现行教材中的多为验证性实验其在教学中的作用虽不可低估，但演示实验由教师表演和操作，学生被动观察和接受；学生实验规定了仪器，药品和步骤，学生只能照方抓药，亦步亦趋、不利于学生主观能动性的发 Chemistry experiment is an important means to enable students to gain knowledge, skills and ability to develop in chemistry teaching in middle school. However, most of the current teaching materials are confirmatory experiments. Although their role in teaching can not be underestimated, the demonstration experiments are performed and performed by the teachers. The students passively observe and accept the experiments. The students’ experiments stipulate the instruments, medicines and procedures, Grasping medicine, follow the trend, is not conducive to students’ subjective initiative hair