水是我们很熟悉的物质,学习化学以后,我们对水有了一些新的认识

水是我们很熟悉的物质,学习化学以后,我们对水有了一些新的认识。

   1)知道了水的微观结构。构成水的粒子可表示为           (填序号)。

 

2)了解了水的宏观组成。水中氢元素的质量分数是           

3)认识了水的化学性质。写出下列化学反应方程式:

①水中通直流电                              

②水与生石灰反应                                        

答案

1A   211.1%  32H2O2H2+O2  CaO+ H2O =Ca(OH)2

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