问题 问答题

在探究“水的沸腾”的实验中:

(1)图1A和B分别是甲乙两小组同学所做的实验.图C是他们绘制的沸腾图象.a图线所选择的装置应是______(A/B).

(2)图1D是他们观察水沸腾______(前/时)实验中出现的情景.

(3)现有丙丁两组同学在某实验室里做“水的沸腾”实验,选用的实验装置相同,他们绘制的沸腾图象如图1E所示.问a、b图象不同的原因是______.

(4)当温接近90℃时,丙丁两组同学每隔1min记录一次温度,根据表格里记录的数据,请你在图2小方格纸上画出的图象.

时间/min012345678910
温度/℃8587899294969798989898
(5)实验后的沸水放在桌上越来越凉,图3图象中能表示其温度T随时间t变化关系的是______.

答案

(1)观察图A和B可以看出,B中烧杯上加了盖子,这样在加热时,杯内的气压会增大,水的沸点会升高,有可能超过100℃,因此,a图线所选择的装置应是B套装置;

(2)D图中气泡在上升过程中体积逐渐减小,所以是沸腾前的现象.

(3)读图C可以看出,在同样加热的情况下,b的升温较慢,其原因应该是水的质量多于a的缘故;

(4)由各个数据描点画图即可.如图所示:

(5)实验后的沸水放在桌上越来越凉,直到与室温相同后不再变化,故D正确;

故答案为:(1)B;

(2)前;

(3)烧杯中水的质量不同;

(4)如图;

(5)D.

完形填空
完形填空。
     I __1__ an uncle. His name is Ed Black. He is from America. He is an English teacher in China, now.
  He likes to go to the __2__ on weekends.
     Today Ed wants __3__ an action movie. He likes this kind of movies. And his __4__ Chinese actor is
  Cheng Long. But there is __5__ action movie at the movie house. There is only a comedy. Ed sees it and
  finds it's very __6__ . He is very happy now. He thinks action mowes and __7__ are both  very good.
 He tells something __8__ this movie to his students when he meets __9__ . His students are happy, 
  too.  They also want to see it.  " What's the __10__ of the movie?"  ask his students. " Oh, sorry ,  I don't
  know, "  answers Ed.
( ) 1. A. have    
( ) 2. A. school  
( ) 3. A. to see  
( ) 4. A. new      
( ) 5. A. no      
( ) 6. A. bad      
( ) 7. A. comedy  
( ) 8. A. about    
( ) 9. A. we      
( ) 10. A. name    
B. has        
B. bed        
B. to look    
B. first      
B. not        
B. interest    
B. comedies    
B. to          
B. us          
B. price      
C. having    
C. movies    
C. seeing    
C. favorite  
C. no a      
C. boring    
C. thrillers
C. with      
C. they      
C. age      
D. to have    
D. price      
D. looking at  
D. like        
D. /          
D. funny      
D. thriller    
D. at          
D. them        
D. dollar      
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