制取氨气并完成喷泉实验(图中夹持装置均已略去)。(1)写出实验室制

制取氨气并完成喷泉实验(图中夹持装置均已略去)。

(1)写出实验室制取氨气的化学方程式:__________________________。

(2)收集氨气应使用___________ 法,要得到干燥的氨气可选用___________作干燥剂。

(3)用甲图装置进行喷泉实验,上部烧瓶已装满干燥氨气,引发水上喷的操作是__________。该实验的原理是__________。

(4)如果只提供如乙图的装置,请说明引发喷泉的方法。

答案

(1)2NH4Cl+Ca(OH)22NH3↑+CaCl2+2H2O

(2)向下排空气  碱石灰

(3)打开止水夹,挤出胶头滴管中的水  氨气极易溶解于水,致使烧瓶内气体压强迅速减小

(4)打开夹子,用手(或热毛巾等)将烧瓶捂热,氨气受热膨胀,赶出玻璃管内的空气,氨气与水接触,即发生喷泉。


相关题目

_____ I can see what you mean, even though I don’t share your point of view. A
_____ I can see what you mean, even though I don’t share your point of view. A. On the way       B. In the way       C. All the way      D. In no way
据《礼记·玉藻》记载和考古发现得知,簋是重要的礼器,主
据《礼记·玉藻》记载和考古发现得知,簋是重要的礼器,主要用于祭祀时放置煮熟的饭食,一般与鼎相配合使用。周礼规定,天子用九鼎八簋,诸侯用
下列说法中不正确的是(    )A.由可知,一段导体的电阻跟它
下列说法中不正确的是(    )A.由可知,一段导体的电阻跟它两端的电压成正比,跟通过它的电流成反比B.由可知通过一段导体的电流跟加在它两端的电
单项选择 --Please tell _____ your name and telephone number. ---OK.    
单项选择 --Please tell _____ your name and telephone number. ---OK.        A. I                       B. me                           C. m
Is Mr. Wang good at drawing his students into___discussion? A. lovely   B. liv
Is Mr. Wang good at drawing his students into___discussion? A. lovely   B. lively  C. warmly   D. seriously
已知等差数列{ }中, ≠0,若m>1,且 - + =0, =38,
已知等差数列{ }中, ≠0,若m>1,且 - + =0, =38,则m的值为() A.38 B. 20 C.19D. 10
26. The old woman could not _____ the terrible noise, and she had to close the d
26. The old woman could not _____ the terrible noise, and she had to close the door and windows. A.bear                    B. accept                   C. receive   
Barack Obama was born on August 4, 1961 in Honolulu, Hawaii. His father came to
Barack Obama was born on August 4, 1961 in Honolulu, Hawaii. His father came to America from Kenya, which is a country in Africa. His parents, Ann and Barack, met when they were students at the Unive

最新题目