化学教学中所进行的演示实验,一般可概括为两种不同的做法:一是先进行演示实验,根据观察到的现象,引导学生分析并作出结论。另一种是先向学生讲清楚实验的装置,操作步骤,告诉学生应该观察到的现象和得出的结论,然后用实验证实这些结论或原理。现在就两种不同的演示做法谈几点粗浅的体会。 The demonstration experiments conducted in chemistry teaching can generally be summarized as two different approaches: First, demonstration experiments are conducted first, and students are guided to analyze and make conclusions based on observed phenomena. The other is to explain to the students clearly the device of the experiment, the operation steps, tell the students what they should observe and the conclusions they have drawn, and then use experiments to confirm these conclusions or principles. Now I will talk about some superficial experiences about two different demonstration methods.