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过去,当讲到初三化学“碳”的吸附作用时。我们只作将烧热的碳块(或屑)置入盛有棕色的 NO_2瓶中,使棕色消失的实验。又因继续作了碳吸附色素的实验,同学们误会成碳只能吸附色素,而不是吸附气体本身。这学期我对此实验作如下的改进:取一玻璃管(内径约0.5毫米)弯成如图左方“U”形。再取一锥形烧瓶,配一双孔橡皮塞,一孔插入一端拉成尖嘴 B 的直管,另孔插入一端带有软橡皮管与夹子的“Γ”形玻管,用一较长的橡皮管将 A、B 连起来。
In the past, when it came to the third-day chemical “carbon” adsorption. We only put the hot carbon blocks (or crumbs) into a brown NO 2 bottle, so brown disappear experiment. As a result of continuing the experiment of carbon adsorption pigments, students misunderstand that carbon can only adsorb pigment, not adsorbed gas itself. This semester I made the following improvements to this experiment: Take a glass tube (about 0.5 mm in diameter) and bend it to the left “U” shape as shown in the figure. Then take an Erlenmeyer flask, equipped with a double hole rubber plug, one hole into the straight pipe pulled into sharp beak B, the other hole into the end with a soft rubber tube and clip “Γ” shaped glass tube, with a longer Rubber hose will be A, B together.