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25.(10分) (1)                  ;   (2)                  

(3)

 

2009年高中阶段学校招生与初中毕业生学业模拟考试

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24.(7分) (1)               ;(2)①                  ,②                    

(3)                        

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23.(13分)

白色粉末的成分

形成的原因

可能是CaCO3

石灰水与空气中CO2反应:

化学方程式为:                                       

 

可能是           

暑假气温较高,溶质的溶解度降低或溶剂蒸发,石灰水中的溶质结晶析出

经过反复思考,同学们认为白色粉末还可能是                          的混合物.

(2)设计实验:理由是:                                                         

为了得出较严密的结论,他们进行了如下实验,请完成下列实验报告:

实验步骤

可能观察到的现象

结论

取上述试管中的上层清液,滴加1~2无色酚酞试液

 

 

往上述试管中的残留的固体中加入稀盐酸

 

白色粉末中        

(“有”或“无”) CaCO3

由上述实验可知白色粉末的成分是:_________________________

(3)交流与反思:①                             

②化学方程式                                                            

五、计算题(本题有2小题,共17分)

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22.(14分)(1)①                 ,②                   

(2)                 

化学方程式                                                             

(3)化学方程式                                                             

化学方程式                                                            

a →                                                             

(4)                                                                     

(5)                                                                     

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21.(9分) (1)名称是                ;固体B的化学式为                      

(2)步骤①化学方程式                                                       

步骤④化学方程式                                                       

(3)                                                                       

(4)                                                                       

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20.(9分)(1)A               ;B                 ;C                  

(2)化学方程式:                                                               

                                                                             

(3)规律:                                                                    

                                                                              

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19.(6分) (1)金属铜的                 性。

 

(2)①化学方程式:                                                           

       ②分馏属于                变化;

③设计的优点:                                                          

                                                                         

(3)内部火焰的作用是                                                       

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18.(4分)依据的现象是                                                        

得出的结论是                                                             

金属A是                              ,溶液B是                         

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17.(7分)(1)                                   。(2)X=                      

(3)                                  (4)                                 

(5)化学方程式:                                                           

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16.(3分)(1)原因是                                                            

(2)X的化学式               ,推断的依据是                                 

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