问题 实验题

实验是学习化学的一个重要途径。

(1)根据下图回答问题。

A                 B          C           D               E

①仪器a的名称是      

②实验室用高锰酸钾制取氧气时,所选用的发生装置是     (填字母序号,下同),收集装置是    或E。用过氧化氢溶液和二氧化锰制取氧气的化学方程式为     

(2)实验室配制50g 5%的氯化钠溶液的操作示意图如图所示。其中玻璃棒的作用是       。该实验的正确操作顺序为        (填字母序号)。

答案

(1) ①集气瓶  ②A   C    2H2O2   2H2O + O2

(2) 搅拌      CBDEA

题目分析:(1)实验室用高锰酸钾制取氧气,属固固加热型,选A装置,氧气的密度比空气大,难溶于水还可以用排水法收集;过氧化氢溶液和二氧化锰生成水和氧气,其中二氧化锰是反应的催化剂;

(2)配制溶液的一般过程是:计算、称量、溶解。其中用到的玻璃棒的作用是搅拌,加快溶解速率

完形填空
完形填空。
     In Brazil, soccer is   1   an art form. That is the best   2   for the soccer museum to be built.
     Brazil is the land that   3   footbail greats   4   Garrincha, Zico, Romario, Ronaldo, Kaka, and the   5   of all,
Pele. It is the only country    6   for every World Cup, and the only one to win it five times.
     In order to   7   the greatest sport of the nation, the Museum do Futebol, or Football Museum, opened at
Pacaembu Stadium in Sao Paulo. 
       8   entering the   9   10  are greeted  11  Portuguese, Spanish and English by a life-size image of Pele,
who is so famous in brazil  12  he is known simply  13  "O Rei," or "The King".
     "The Louvre has the  14 . We have our own piece of  15  -Pele," said Hugo Sukman of the Roberto Marinho
Foundation, which helped  16  the construction of the museum.
     In many ways, the museum is a shrine (神龛) to Pele.
     One of its most impressive displays is a temporary exhibit with 140 items from Pele's personal collection. 
 17  the wooden shoeshine box he used as a boy to  18  spare change and the ball from his l, 000th  19  in 1969.
     "Inevitably, a museum about football is also a museum about the  20  of Brazil and Brazilian culture," said
Leonel Kaz, the museum's curator (馆长).
( )1. A. regarded         
( )2. A. excuse           
( )3. A. made             
( )4. A. included         
( )5. A. more famous      
( )6. A. to have qualified      
( )7. A. praise           
( )8. A. Upon             
( )9. A. stadium          
( )10. A. fuotballers      
( )11. A. of               
( )12. A. that             
( )13. A. for              
( )14. A. Mona Lisa        
( )15. A. exhibition       
( )16. A. support          
( )17. A. contained        
( )18. A. gain             
( )19. A. goal             
( )20. A. history          
B. considered 
B. cause      
B. born       
B. including  
B. less famous         
B. to qualify 
B. honor      
B. With       
B. house      
B. curators   
B. in         
B. which      
B. within     
B. Venus      
B. image      
B. fund       
B. containing 
B. raise      
B. score      
B. tradition  
C. compared         
C. design             
C. grew                   
C. such as           
C. most famous         
C. qualify         
C. exhibit       
C. At                 
C. museum             
C. visitors         
C. into               
C. what              
C. as                  
C. Van Gogh        
C. art             
C. build                
C. included        
C. earn               
C. kick               
C. customs        
D. made                 
D. reason              
D. produced             
D. for example       
D. lease famous        
D. qualifying      
D. pass on              
D. Once                 
D. land                   
D. images         
D. with                
D. as               
D. without                  
D. treasure       
D. painting          
D. design                 
D. including     
D. achieve             
D. door                 
D. civilization  
单项选择题