问题 实验题

实验室中有一瓶标签破损的固态铵盐,它可能是NH4Cl、NH4NO3、NH4HCO3、(NH4)2SO4中的一种,请利用下图所示的溶液进行实验探究.

(1)【提出猜想】

猜想①:该铵盐是NH4Cl

猜想②:该铵盐是          

猜想③:该铵盐是NH4HCO3

猜想④:该铵盐是(NH4)2SO4

(2)【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(NO3)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.

(3)【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

答案

(1)NH4NO3

(2)步骤一:稀盐酸(或HCl)

步骤二:④

步骤三:硝酸银;①

(3)NH4NO3+NaOH=NaNO3+NH3↑+H2O

阅读理解

阅读理解。

     Mr Green worked in an office. He had no wife or children. And he lived in an old house alone. He

liked nothing but drinking. He almost spent all his money drinking. Sometimes he was hungry, and he had

to borrow some money from his friends to buy a little food. One evening he met a friend of his in the

street. The man asked him to have dinner in a restaurant. He was glad and drank a lot. When they left

there at midnight, he couldn't stand. The man had to stop a taxi and asked the driver to take him home.

Soon they got to the door of his house, with the help of the driver, he got out of the car.     "Thank you,

sir. " said Mr Green, "Now I can open the door myself. "     The taxi went away, but he couldn't put the

key into the keyhole. He was trying to do it when a policeman came.     "Can I help you put the key into

the keyhole, sir?"     "Thank you, sir," said Mr Green, "The house is circling now. If you can stop it now,

I can open the door myself. "

 根据短文内容,判断句子的正(T)误(F)。  

( )1. Mr Green liked drinking very much.                                            

( )2. Mr Green couldn't stand because he drank more than he could.                  

( )3. A friend asked Mr Green to have dinner because he was so hungry.              

( )4. The taxi driver sent Mr Green home and helped him out of the car.            

( )5. The house turned round and round, so Mr Green couldn't open the door himself .  

填空题