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【简答题】
实验室中有一瓶标签破损的固态铵盐,它可能是NH 4 Cl、NH 4 NO 3 、NH 4 HCO 3 、(NH 4 ) 2 SO 4 中的一种,请利用下图所示的溶液进行实验探究. 【提出猜想】猜想①:该铵盐是NH 4 Cl 猜想②:该铵盐是______ 猜想③:该铵盐是NH 4 HCO 3 猜想④:该铵盐是(NH 4 ) 2 SO 4 【实验探究】步骤一:取少量样品放入试管中,没有嗅到强烈的氨味,加入适量水溶解得到无色液体,选用图中的______溶液滴入试管中,无气泡放出,则猜想③不成立. 步骤二:在步骤一所得的溶液中,滴加图中的Ba(NO 3 ) 2 溶液,没有白色沉淀生成,则猜想______不成立. 步骤三:另取适量样品放入试管中,加水溶解配成溶液,滴加图中的______溶液,有白色沉淀生成,则猜想______成立. 【拓展应用】铵盐可作氮肥,它会与碱性物质发生化学反应,请写出硝酸铵溶液与氢氧化钠溶液在加热条件下反应的化学方程式______,所以在农业生产中,为避免降低肥效,铵态氮肥不要与碱性物质混合施用.
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参考答案:
举一反三
【简答题】TheSeller agrees to sell the Buyer _____________ pieces of men's jackets.
【单选题】The Buyer agrees to buy and the Seller agrees to sell the( ) commodity.
A.
under
B.
underneath
C.
below
D.
under mentioned
【单选题】Mary went to the box office at lunch time, but all the tickets __________ out.
A.
would sell
B.
had sold
C.
have sold
D.
was selling
【单选题】(单项选择题)全陪的在旅游过程中,承担的首要任务是()。
A.
做好旅游者人身和财产安全工作
B.
宣传调研工作
C.
各站之间的有机衔接,按照计划对各站服务进行协助、检查和督促
D.
维护旅游团的团结
【单选题】________ is a practice whereby a producer agrees to sell a brand to a dealer only if the dealer agrees to sell some or all of the rest of its products.
A.
Horizontal price fixing
B.
Horizontal integration
C.
Full-line forcing
D.
Direct marketing
E.
Disintermediation
【简答题】按PLC物理结构形式的不同,可分为 和模块式两类。
【单选题】The Buyer agrees to buy and the Seller agrees to sell the under-mentioned commodities according to the terms and conditions ___________ below:
A.
stipulated
B.
stated
C.
negotiated
D.
suggested
【单选题】Mary agrees to sell a used car to Bill for $ 5,000. After Bill pays, Mary tells him to come over and pick up the car. However, Bill waits until Wednesday to pick up the car. In the meantime, the car i...
A.
Mary.
B.
Bill
C.
Neither Mary and Bill
D.
Both Mary and Bill
【简答题】按 PLC物理结构形式的不同,可分为 、 和模块式三大类
【判断题】按PLC物理结构形式的不同,可分为整体式和模块式两类
A.
正确
B.
错误
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