化学学科属于一门实验科学，中学化学教学必须以实验为基础，把实验作为化学教学的基本手段。从客观上讲，化学对实验要求较高。例如：义务教育大纲要求初三化学实验为３１项（人教版初三教材共有演示实验８５个）。学生实验１１个，选做学生实验９个。初三化学总课时为９６节 The chemistry subject belongs to an experimental science, and the middle school chemistry teaching must be based on experiments and the experiment is used as a basic method of chemistry teaching. Objectively speaking, chemistry requires a high degree of experimentation. For example, the compulsory education program requires 31 chemical experiments for the third year (85 teaching demonstrations for the third edition of the teaching version of the People’s Education Press). There are 11 student experiments and 9 student experiments. The total chemistry for the third grade is 96