1 钠在空气中燃烧实验的教学现状(1)执教高一化学的教师想必会有这样的感觉:按教材图2—2所示的装置进行实验,要想得到淡黄色的固体 Na_2O_2是很困难的、按教师教学用书笫34页“演示实验说明和建议”的改进方法,把钠“放在试管里加热”,由于很难有空气进入试管,几乎也没有实验效果。(2)实验中观察到的许多实验现象,至今还很少有 1 sodium in the air combustion experiment teaching status (1) Coaching chemistry teacher must have this feeling: According to the teaching of the device shown in Figure 2-2 experiment, in order to get pale yellow solid Na_2O_2 is very difficult According to the teacher’s instruction book, “Experimental Description and Suggestion” on page 34, sodium is “heated in a test tube”. Since it is difficult to have air into the test tube, there is almost no experimental result. (2) Many experimental phenomena observed in the experiment are still rare