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所谓课堂演示实验,就是教师用演示的方法、结合课堂教学而进行的化学实验,其特点是操作简便,现象明显,具有较强的直观性与示范性.通过演示实验,不仅可以使学生比较容易地接受新知识,还可以使学生了解正确使用仪器及试剂的方法和操作过程,以便日后独立进行实验时能使用或容易学会使用这些仪器和试剂,并进行正确的实验操作.因此,演示实验是化学教学中最常用的直观手段之一.从演示实验的目的看,可以把演示实验分成传授新知识的演示实验、验证或巩固所学知识的演示实验及指导性演示实验三种类型.
The so-called classroom demonstration experiment, is a teacher demonstration method, combined with classroom teaching and chemical experiments, which is characterized by simple operation, the phenomenon is obvious, with strong intuitive and demonstrative experiment, not only can make students easier To accept the new knowledge, but also to enable students to understand the correct use of instruments and reagents methods and procedures for independent experiments in the future can be used or easy to learn to use these instruments and reagents, and the correct experimental operation.Therefore, the demonstration experiment One of the most commonly used visual methods in chemistry teaching is the purpose of demonstration experiments, which can be divided into three types: demonstration experiment to impart new knowledge, demonstration experiment to verify or consolidate knowledge, and experimental demonstration experiment.