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问题 选择题

盐酸滴入Na2CO3溶液中，有下列反应：

Na2CO3+HCl====NaHCO3+NaCl                                                ①

NaHCO3+HCl====NaCl+H2O+CO2↑                                             ②

并将含有HCl 0.2 mol的稀盐酸，加入含Na2CO3 0.14 mol的溶液中，经充分反应后，溶液中各物质的量是（   ）

　Na2CO3　 HCl　      NaCl     NaHCO3

A．0 mol 0 mol 0.2 mol 0.08 mol

B．0.4 mol 0 mol 0.2 mol 0 mol

C．0 mol 0.06 mol 0.14 mol 0.14 mol

D．0 mol 0 mol 0.06 mol 0.08 mol

答案

答案：A

盐酸逐滴滴入Na2CO3溶液中后，首先发生反应①，待全部Na2CO3转化为NaHCO3后，再进行反应②，0.14 mol Na2CO3转化成NaHCO3消耗HCl 0.14 mol，剩余HCl 0.06 mol，生成NaHCO3 0.14 mol，剩余的HCl再与NaHCO3反应消耗NaHCO3 0.06 mol，剩余NaHCO3 0.14 mol-0.06 mol="0.08" mol，共生成NaCl 0.2 mol（可从Cl元素守恒讨论）。

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     One morning a student was walking with his teacher when they noticed a pair of old shoes by the roadside.
They  1  the shoes might belong to a poor man. In fact, the  2  of the shoes was working in a field nearby, and
he had nearly  3  his work.
     The student said to his teacher, "Let's play a trick on the man; we hide his shoes, and wait to see what he
will do  4  he can't find them."
     "My young friend, we should never have  5  by tricking others like that," answered the teacher."  6 , let's
Put a  7  in each of the shoes, and watch what he will do."
     The student did so, and then they  8  nearby.
     The man soon came back to get his  9 , but when he slipped his foot into one of his shoes, he felt
something  10  in it. He bent down and found the coin (硬币). 
      11  appeared on his face. He looked at the coin for a minute, and then  12 , but nobody could be seen.
     He then went on to put on the other shoe,  13  he was even more surprised to find the  14  coin. He then
knelt down (跪下), looked up to heaven and said  15  aloud, in which he spoke of his wife,  16  and helpless,
and his children without bread.
    The student was deeply moved (感动的), and his eyes were filled with tears. a Now," said the teacher,"you
must be much more pleased than if you had played your  17 ."
     The boy replied, "You have taught me a lesson which Fll never  18 . I feel now the truth of these words,
which I didn't  19  before: ' It is more blessed (神圣的) to  20  than to receive. '"
( )1. A. believed  
( )2. A. owner     
( )3. A. enjoyed   
( )4. A. since     
( )5. A. lessons   
( )6. A. Instead   
( )7. A. stone     
( )8. A. hid       
( )9. A. lunch     
( )10. A. terrible 
( )11. A. Surprise 
( )12. A. looked up
( )13. A. for      
( )14. A. strange  
( )15. A. goodbye  
( )16. A. homeless 
( )17. A. trick    
( )18. A. learn    
( )19. A. hear     
( )20. A. work      		B. found       
B. maker       
B. changed     
B. when        
B. experience  
B. Generally   
B. coin        
B. stood       
B. coal        
B. hot         
B. Fear        
B. looked around
B. so          
B. second      
B. yes         
B. lively      
B. role        
B. take        
B. understand  
B. refuse       		C. decided    
C. seller     
C. finished   
C. while      
C. fun        
C. Afterwards 
C. sweet      
C. worked     
C. drink      
C. hard       
C. Pity       
C. looked down
C. but        
C. interesting
C. hello      
C. careless   
C. game       
C. forget     
C. remember   
C. advise      		D. thought   
D. repairer  
D. started   
D. until     
D. games     
D. Maybe     
D. clip      
D. rested    
D. shoes     
D. soft      
D. Courage   
D. looked out
D. or        
D. lost      
D. thanks    
D. sick      
D. cards                          
D. accept    
D. write     
D. give      
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单项选择题 B型题

急性冠状动脉综合征首选

A.硝普钠

B.硝酸甘油

C.地尔硫卓

D.阿替洛尔

E.贝那普利
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