演示实验是指教师运用仪器药品,人为的引起某个所学的现象和过程的出现,从而使学生获得感性知识的方法.初中化学实验教学中,演示实验是数量最多、应用最广、最有效的一种教学形式,它具有直观性、示范性、启发性和教育性的特点,在各类实验中居于主导地位. Demonstration experiment refers to the method that teachers make use of instrument and medicine to cause some phenomenon and process of learning by oneself, so that students can acquire perceptual knowledge. In junior high school chemistry experiment teaching, demonstration experiment is the most abundant, the most widely used and the most effective A kind of teaching form, which has the characteristics of intuition, demonstration, enlightenment and education, and occupies the leading position in all kinds of experiments.