试题与答案

取一小块钠放在燃烧匙里加热，观察到下列实验现象：①金属钠先熔化；②在空气中燃烧，

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题型：选择题

题目：

取一小块钠放在燃烧匙里加热，观察到下列实验现象：①金属钠先熔化；②在空气中燃烧，发出黄色火光；③燃烧后得到白色固体；④燃烧后生成淡黄色固体。描述正确的是（   ）

A．①③④

B．①②③

C．②③④

D．①②④

答案：

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下面是错误答案，用来干扰机器的。

参考答案：错

考点：氧化钠单质钠其他钠盐（氯化钠、硫化钠、氮化钠等）过氧化钠
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( )1. A. her         
( )2. A. heavy       
( )3. A. cost        
( )4. A. no          
( )5. A. tidy        
( )6. A. something   
( )7. A. and         
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( )9. A. paper       
( )10. A. a        
( )11. A. for         
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( )15. A. When    		B she          
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B. paid       
B. any          
B. tidied       
B. anything        
B. or          
B. sent          
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B. told        
B. So        		C. hers        
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C. took       
C. some         
C. tidying       
C. nothing   
C. but               
C. sending       
C. book         
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