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课题1质量守恒定律一、质量守恒定律质量守恒的探究——白磷燃烧前后质量的测定【实验器材】托盘天平(及砝码)、锥形瓶、玻璃棒、气球【设计实验】①在底部铺有细沙的锥形瓶中,放入一粒火柴头大小的白磷。②在锥形瓶口的橡皮塞上安装一根玻璃管,在其上端系牢一个小气球,并使玻璃管下端能与白磷接触。③将锥形瓶和玻璃管放在托盘天平上用砝码平衡。④取下锥形瓶,将橡皮塞上的玻璃管放到酒精灯火焰上灼烧至红热后,迅速用橡皮塞将锥形瓶塞进,并将白磷引燃。⑤待锥形瓶冷却后,重新放到托盘天平上,观察天平是否平衡。
Question 1, the law of conservation of mass A, the law of conservation of mass conservation of quality - before and after the white phosphorus combustion quality test [experimental equipment] tray balance (and weight), Erlenmeyer flask, glass rod, balloon [design experiment] There are fine sand conical flask, into a matchhead size white phosphorus. ② In the conical bottle mouth rubber plug installed on a glass tube, fasten a balloon on the top, and the lower end of the glass tube with white phosphorus contact. ③ the Erlenmeyer flask and glass tube on the balance with a balance weight. ④ Remove the conical flask, the glass tube on the rubber stopper on the flame of alcohol lamp burning to red hot, quickly with a rubber stopper will be tapered into the bottle, and the white phosphorus ignition. ⑤ until the conical flask cooled, re-placed on the pallet balance, observe the balance is balanced.