问题 填空题

四种短周期的主族元素A、B、C、D,它们原子的电子层数与最外层电子数之比分别是3 :1,l : l,1 : 2和l :3。

据此回答下列问题:

(1) 写出A、D的元素符号:A           、D         

(2)在所有满足上述信息的短周期元素中,最高价氧化物的水化物酸性最强的是(填化学式)      ;由A、D两元素构成的化合物A2D2的含有的化学键类型                                 

(3)写出所有满足上述信息的化合物CD2与化合物A2D2反应的化学方程式:

                                                                          

(4)若B、C与A处于同一周期,则B、C的化合物与水反应的化学方程式为:

                                                                          

答案

(14分)(1)A   Na  (2分)、D  O (2分)。

(2)H2SO4 (2分);离子键和共价键(或离子键和非极性键)(2分)

(3)2CO2+2Na2O2=2Na2CO3+O2 (2分)    SO2+ Na2O2=Na2SO4(2分)

(4)Al2S3+6H2O=2Al(OH)3↓+3H2S↑(2分)

单项选择题
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All her life, my mother wanted busy children. It was very important that her house should remain at all things clean and tidy.

You could turn your back for a moment in my mother's house, leave a half written letter on the dining room table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged." as she explained.

My wife, on one of her first visits to my mother's house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused(疑惑的), she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks, so as not to make water rings on the end tables. Now she knows better.

These disappearances had a confusing effect on our family. We were all inclined to (有......的倾向) forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing?" was a question frequently asked, but rarely answered.

Now my sister has developed a second-hand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

68. Which of the following is TRUE about my mother?

A. She enjoyed removing others' drinks.             B. She became more and more forgetful.

C. She preferred to do everything by herself.      D. She wanted to keep her house in good order.

69. My wife could not find her biscuits and drink in my mother's house because _______.

A. she had already finished them                        B. my mother had taken them away

C. she forgot where she had left them                 D. someone in my family was holding them

70. The underlined part to the fifth paragraph suggests that my sister _______.

A. is happy to clean windows                                   B. loves to clean used windows

C. is fond of clean used windows                       D. likes clean windows as my mother did

71. This passage mainly tells us that _______.

A. my mother often made us confused                B. my family members had a poor memory

C. my mother helped us to form a good habit     

D. my wife was surprised when she visited my mother