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教师在讲木炭的吸附性时 ,可以先不告诉学生什么是吸附作用 ,而是指导学生 ,先观察木炭分别放入盛二氧化氮的集气瓶和盛红墨水的烧杯里的现象 ,根据现象 ,教师引导学生分析 ,红棕色的二氧化氮气体和红墨水的红颜色到什么地方去了 ?必然会引起学生的积极思考 ,从而抓住这两个演
When teachers talk about the adsorption of charcoal, they may not tell students what adsorption is. Instead, they will instruct students to observe the phenomenon that charcoal is placed in a nitrogen gas collection cylinder and a Shenghong ink beaker respectively. The teacher guides the students to analyze where the red-brown nitrogen dioxide gas and the red color of the red ink go. It will inevitably lead students to think positively and thus seize the two plays.