搜题请搜索小程序“爱下问搜题”
问题 实验题

下图是某课外活动小组的同学设计的实验室制取CO2并检验其性质的装置示意图，请回答下列问题：

（1）代号a所指仪器的名称是_________，A装置中发生的化学方程式为_______________；

（2）将A中产生的气体通入到B中一会儿，未见其中变浑浊。李祥同学认为这是浓盐酸挥发出的HCl气体干扰所致。他用化学方程式表示为： Ca(OH)2 + CO2 = CaCO3 ↓+ H2O；CaCO3 + 2HCl = CaCl2 + H2O + CO2↑ 你的解释还可更简捷，请用一个化学方程式表示：______________；

（3）张华同学用烧瓶收集A中产生的气体后，向其中加入过量无色透明的M溶液组成C装置，振荡，发现烧瓶中的气球逐渐变大，且溶液始终无色透明，则M可能是_______ （填写一种物质的化学式）；

（4）请设计一个方案，验证C装置中反应的生成物中含有CO32-。简述实验过程：_________________________________________；

（5）将A中药品换成过氧化氢溶液和二氧化锰。则反应的化学方程式为_________________________。

答案

（1）试管； CaCO3 + 2HCl = CaCl2 + H2O + CO2↑    

（2）2HCl + Ca(OH)2 = CaCl2 + 2H2O      

（3）KOH（或NaOH）

（4）向其中加入BaCl2溶液，若生成白色沉淀，即可证明其中含CO32- （或：向其中加入过量（或足量）的稀盐酸，若有气泡冒出，则可证明其中含CO32- （或其他合理表述）

（5）2H2O22H2O+O2↑  

完形填空
完形填空。
     Rosa likes making up (编造) stories. At first she thought it was 1            . But now she didn't think so.
     Rosa's parents were divorced (离婚). Nine months out of the year, Rosa lived with her mother in an
apartment on Anderson Street. But when summer 2            , she went to her father's farm in Arizona.
     The farm was great! Rosa rode horses and 3              with some farm work. Her father, however,
was so busy that he couldn't find time to go places with her. When she arrived each summer, her father
would meet her at the airport and take her out to eat. And the day she went 4              the city, he would
always buy her a present. 
     5              summer came to a close, Rosa returned to her mother. At school she heard lots of stories
her friends told about their family trips. Rosa wished she had a family trip to talk 6             . 
     Not long after school began, Rosa was looking through travel magazines in the school library. They
talked about many exciting 7             , like England and Germany. When Rosa's friends asked what she
had done that summer, she made up something that was 8              . Remembering the travel magazines
she had looked at, she told her classmates that she and her father had gone to 9              . 
     When the class began studying England, Mr. Thomas asked Rosa to 10              them all the things
she could remember about her trip to England!
( )1.  A. joke    
( )2.  A. passed  
( )3.  A. made    
( )4.  A. back to  
( )5.  A. Until    
( )6.  A. to     
( )7.  A. people  
( )8.  A. interesting
( )9.  A. England   
( )10. A. say      		B. fun    
B. arrived
B. played  
B. away  
B. So far 
B. about   
B. cities  
B. true   
B. Germany 
B. speak 		C. turn   
C. lasted  
C. helped  
C. in    
C. Unless  
C. with   
C. languages
C. long   
C. farm   
C. tell   		D. game       
D. changed 
D. did    
D. out of     
D. When   
D. from        
D. places
D. same     
D. home     
D. talk     
查看答案
填空题

________是水痘的病原体。
查看答案