问题 填空题

(第一个空1分,其它每空2分,共9分)有A、B、C、D、E五种短周期元素,已知相邻的A、B、C、D四种元素原子核外共有56个电子,在周期表中的位置如图所示。E的单质可与酸反应,1molE单质与足量酸作用,在标准状况下能产生33.6LH2;E的阳离子与A的阴离子核外电子层结构完全相同。

回答下列问题:

(1)B的元素名称为        ,D在周期表中的位置                  

(2)A,C,D对应的离子半径由大到小顺序为                ,(用化学符号表示)

(3)D的单质与水反应的离子方程式为_                               

(4)向D与E形成的化合物的水溶液中滴入过量烧碱溶液,用离子方程式表述                                                                 

         

答案

(1)磷,     第三周期ⅦA族

(2) S2—>Cl>O2-

(3)Cl2+H2O=H++Cl+HClO

(4)Al3+4OH--=AlO2+2H2O

改错题

      

V.短文改错

Dear editor,

Some years ago, my hometown was used to be a beautiful place.                 66.                

Thick trees and grass can be seen all over the hills.                                     67.                

As time going by, people destroyed almost the whole                              68.                

forests grow more crops. To make matters worse, people let their                    69.                

cattles eat up the grass. So, you can only see wasteland                                   70.                

instead green forests now. As a result, when it rains, the                             71.                

soil is washed down the hills and in the rivers. Strong winds also                    72.                

blow away the valuable soil lie on the top of the fields.                                  73.                

I do hope all the people will take good care of the forests                        74.                

and plant more trees to improve our living conditions better.                       75.                

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