实验室常用下列装置制取气体,请你根据所学知识回答下列问题.(1)写出编号所指仪器的名称:①______;

2025-03-15 14:17:04
推荐回答(1个)
回答1:

(1)仪器①的名称是:长颈漏斗;故答案为:长颈漏斗.
(2)以上装置图中共有两处明显错误,A中试管口向上倾斜了,应该略向下倾斜;E中导管进入集气瓶太少,应该伸入集气瓶的底部;故答案为:A中试管口应该略向下倾斜;E中导管应该伸入集气瓶的底部;
(3)用氯酸钾和二氧化锰制取氧气,需选择加热固体产生气体的A装置,与氧气不易溶于水、密度比空气密度大,可以用向上排空气法或排水法收集,选用C装置作为氧气的发生装置,需选择过氧化氢在二氧化锰的催化下生成水和氧气,二氧化锰作催化剂,起催化作用;故答案为:F,催化,
2H202
 MnO2 
 
2H20+02↑;
(4)实验室制取CO2,是在常温下,用碳酸钙和盐酸生成氯化钙和水和二氧化碳,因此不需要加热.二氧化碳能溶于水,密度比空气的密度大,因此只能用向上排空气法收集;故答案为:CaCO3+2HCl═CaCl2+CO2↑+H2O
(5)装置B、C都可以用来制取气体,比较这两个装置的不同,指出B装置的一个突出优点是:可以控制反应的发生和停止,故答案为:可以控制反应的发生和停止;
(6)欲用G装置并用排水法收集H2,由于氢气密度小应从短管进入,先把G装置装满水,再从b管通入氢气即可;故答案为:先把G装置装满水,再从b管通入氢气.

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