_______________A物质属于化肥中的_________________肥选填“氮”、“磷”或“钾”指出C物质在农业生产中的一种用途_________________把A放入水中所得溶液温度显著降低的原因是_________________B与水反应的化学方程式是_________________，反应类型是_________________反应。4某实验中两组分别用下图甲和乙装置做还原氧化铜的实验中，发现从乙装置的导气管口不断有气泡逸出，以为是反应产生的CO未被石灰水完全吸收。于是在乙装置后又连接上丙装置，重新2实验，发现丙装置中仍不断有气泡逸出，且石灰水未见浑浊。那么从丙装置中逸出的气体是什么呢请完成下列探究中的在关问题。
f你认为从丙装置中逸出的气体可能是_________________，写出生成这种气体的化学方程式_______________________________________。
请按下表要求，设计实验方案，验证你的猜想。
写出乙装置中反应的化学方程式_________________。根据以上探究，该实验小组同学认为上述装置还不够完善，其理由是_________________于是他们在丙装置后再增加一个_________________装置，例如_________________。a
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