初三化学第三章中用木炭还原氧化铜的实验,教材中是把黑色氧化铜粉末和木炭粉的混和物放入试管里,把试管斜放(口低底高)在铁架台上加热.这样做很难观察到反应后被还原出来的游离态铜.改进方法是,取25×200毫米的大试管一只,套在塑料瓶的直导管上,见图1.再紧捏装有热水的塑 In the third chapter of the chemistry, the experiment of reducing copper oxide with charcoal was carried out in the third chapter. In the teaching material, the mixture of black copper oxide powder and charcoal powder was put into a test tube, and the test tube was placed obliquely (low height at the bottom) and heated on a metal stand. It is very difficult to observe the free copper that has been reduced after the reaction. The improved method is to take a large test tube of 25×200 mm and put it on the straight pipe of a plastic bottle. See figure 1. Plastic