问题 实验题

接报警,某厨房的煤气管道可能有CO泄漏,一化学兴趣小组成员受命采集该厨房的气样,并检测该气样中是否含有CO气体.小组中一成员戴上防毒面具,进入厨房收集到一集气瓶厨房气样,他们欲用图装置来作检测.请回答下列问题:

(1)检测时出现 _________ 现象可证明厨房气样中含有CO.

(2)小组中有成员提出该装置产生的尾气仍有可能造成环境污染,请你提出处理尾气的方法 _________

(3)采集气样时未携带抽气工具(如注射器等)如何用最简便的方法采到该瓶气样? _________

(4)如何在检测时将集气瓶中的气样导入玻璃管内,请在图中画出示意图.

答案

(1)玻璃管内黑色氧化铜粉末中出现红色固体;

(2)装置尾部连接一个尖嘴导管,并放置一个点燃的酒精灯,将可能剩余的CO烧掉;

(3)将装满水的集气瓶带入厨房,在厨房内倒去水并塞上橡皮塞;

(4)可用水排出集气瓶中的一氧化碳,如图,将分液漏斗中的水加入到集气瓶中.

完形填空
完形填空
     Many kids(孩子) think study(学习) is the __1__ because they
want to go to university (大学) when they grow up. Many kids __2__ do any housework(家务活) at home. Parents don’t let the kids __3__
them. They think the kids are too ___4__ and they can’t do housework
well. Kids have nothing to do after they finish(完成) their homework.
They have to __5___TV or __6___ computer games.
     Many kids __7__ KFC. They eat lots of food when they watch TV. __8___ sports and too much food make the kids fatter and fatter.(越来越胖)
So we can __9__ fat kids here and there.
     A good kid must be good at(擅长于) his lessons(功课). He
should(应该) like sports and should have a strong body. A fat kid __10___a healthy(健康的) kid. A good kid often does some cleaning at school and does some housework at home. He should help others.
(      )1. A. last  
(      )2. A. aren’t
(      )3. A. help  
( )4. A. old    
( )5. A. look  
( )6. A. do    
( )7. A. do    
( )8. A. Not    
( )9. A. look  
( )10.A. is    
B. first    
B. doesn’t
B. to help  
B. young    
B. see      
B. does    
B. does    
B. No      
B. watch    
B. isn’t  
C. one         
C. don’t    
C. to help    
C. interesting
C. watch      
C. play        
C. like        
C. Can’t      
C. see         
C. are        
D. good        
D. isn’t   
D. helping     
D. boring      
D. have        
D. like        
D. likes       
D. Don’t     
D. has         
D. aren’t    
选择题