试题与答案

某化学学习小组欲探究铁及其化合物的氧化性和还原性。(1)实验试剂及仪器:氯化亚铁溶液

题型:问答题

题目:

某化学学习小组欲探究铁及其化合物的氧化性和还原性。

(1)实验试剂及仪器:

氯化亚铁溶液、氯化铁溶液、氯水、KSCN溶液、铁粉、锌片、铜片、稀硫酸、胶头滴管、试管

(2)实验记录

根据上述材料回答下列问题:

(1)在实验②中,有部分同学在氯化亚铁溶液中滴入KSCN溶液后,就出现了血红色,可能的原因是什么?

(2)在配制氯化铁溶液时,由于实验员失误,可能导致溶液中含有少量的Fe,如何检验是否有少量Fe的存在?

(3)作为教师,在进行实验探究教学时,应注意哪些方面?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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           9    this time,the father had opened another cold beer and another match was beginning.     10    
with the boy's interruption, the dad brought a magazine to his son. On the cover of the magazine was a
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       A few minutes later, the boy returned and said, "I have finished,  Daddy!     15    we play catch now?"
  16   , the father glanced towards his child, and there in his small hands    17   the magazine with the world    18   perfectly to gether. The dad asked his child how he put the world together so quickly.
       "It was     19   , "said the boy. "On the back of the world was  the picture of a person, and once I put
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( )2. A. tell        
( )3. A. staring    
( )4. A. enjoy      
( )5. A. suggesting  
( )6. A. asked      
( )7. A. another    
( )8. A. nervously  
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( )11. A. universe  
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( )16. A. Shocked    
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( )18. A. pieced    
( )19. A. difficult  
( )20. A. where      
B. basketball      
B. display        
B. glancing        
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B. anxiously      
B. At              
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C. so            
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C. held          
C. connected      
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D. finish        
D. weeping      
D. scolded      
D. more          
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D. Impatient    
D. person        
D. ruining      
D. down          
D. thus          
D. Can          
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D. fastened      
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