问题 实验题

请根据图示回答下列问题:  

(1)写出图一中标号的仪器名称:①__________,② ______________;

(2)某同学欲用图一装置制取氧气,可选择的物质是(填化学式)__________,用该物质制取氧气的化学方程式为 ____________;

(3)某化学小组同学设计了气体制取与性质验证的组合装置(如图二)。打开分液漏斗活塞放出一定量过氧化氢溶液后,关上活塞,A中出现大量气泡,B中白磷燃烧,C中液面下降,稀盐酸逐渐进入D中。请看图回答下列问题:

①B中白磷能够在水下燃烧的原因是__________。

②E中的实验现象是_________。

③用F装置收集气体的依据是_____________。

④ D中反应的化学方程式为__________。

答案

(1) ①试管 ; ②铁架台 

(2)KMnO4 或KClO3和MnO2   ;2KMnO4K2MnO4+MnO2+O2↑或2KClO32KCl + 3O2

(3)①提供了氧气 ;    ②试液变红    ;③其密度大于空气的密度    ;④ CaCO+ 2HCl == CaCl+ H2O + CO2

完形填空
完形填空。
      Jimmy was unhappy. Jimmy's parents had just lived apart. They were coming for a    1    about his
poor schoolwork and bad behavior.
     Jimmy was the only child. He used to be    2    and was very good at his schoolwork. How could I
tell his father and mother about his poor grades?
     Jimmy's mother entered the room and sat down. Soon his father arrived. Good!    3    they came to
the meeting. They looked at    4    without any feeling.
     When I told them about Jimmy's    5    and schoolwork. I tried to use the right words. I wanted to
show them what they were doing to their    6   . But I don't know what to say. Perhaps they should see
one of Jimmy's carelessly done papers. 
     I found a crumpled (弄皱的) English paper in his desk. Some words were    7   on both sides of the
paper. But there was only one    8   . I gave it to Jimmy's mother. She read it and then, without a word,
handed it to her husband. He frowned (皱眉). He was    9   .
      Then he folded the paper carefully, placed it in his pocket, and reached for his wife's hand. She
wiped the   10   from her eyes and smiled up at him. My eyes were also full of tears. He helped her with
her coat and they left together.
     The words on the paper were, "Dear Mom Dear Daddy I love you I love you."
( )1. A. look   
(     )2. A. tall   
(     )3. A. At least
(     )4. A. the room
(     )5. A. name   
(     )6. A. teacher
( )7. A. found  
(     )8. A. sentence
( )9. A. saying 
( )10. A. them   
B. talk     
B. young    
B. At first 
B. the ground
B. look     
B. son      
B. shown    
B. word     
B. reading       
B. tears    
C. test    
C. happy   
C. At last 
C. me      
C. behavior
C. daughter
C. heard   
C. voice   
C. thinking
C. words       
D. interview 
D. lovely    
D. At once   
D. each other
D. questions 
D. family                          
D. spoken    
D. piece     
D. asking    
D. lights    
单项选择题