题目

A dam is a man-made structure built across a river.Most dams are built to control a river’s water flow, improve navigation andcontrol flooding. However, some dams are built to produce hydro-electricpower. Hydro-electric power is produced as water passesthrough a dam, and into a river below. The more water that passes through adam, the more energy is produced. Once a dam is built, a man-made lake iscreated behind the dam. Electricity is produced by a kind of equipment calleda turbine(水轮机). Turbines contain metal coils(线圈) surrounded by magnets(磁铁). When themagnets move round r某化学课外活动小组在实验室设计了如图所示的实验装置，进行“氨的催化氧化”实验。(1)A处是气体发生装置，A中所用的试剂只能从下列物质中选取：①硝酸铵；②碳酸铵；③碳酸氢铵；④氯化铵；⑤熟石灰；⑥氢氧化钠。若A中制取气体时只用了一种药品，则该药品可以是       (填选项编号)，在只用一种药品制取氨气时，图中空白处所需仪器应为       (选填下列仪器编号，固定装置省略)。(2)该装置补充完整后，仍然存在一定的缺陷，试从安全与环保的角度来考虑，对该装置进行改进：①                               ；②                               。(3)按照改进后的装置进行实验，请完成以下问题：①装置B的作用是                               ；②写出C中发生反应的化学方程式：                               ；③若A、B处试剂足量，则装置D中可以观察到的实验现象有                               。