问题 填空题

有A、B、C、D、E五种主族元素,原子序数依次增大,且不超过36。已知B、C、D同周期,A与D同主族,C与E同主族。A原子最外层电子数为内层电子数的3倍,C原子的内层电子总数为最外层电子数的2倍,B在同周期主族元素中原子半径最大。

(1)写出B2A2的电子式:______________________________________________________。

(2)已知E2A3为有剧毒的白色固体,微溶于水,易溶于浓HCl和NaOH溶液。写出E2A3分别和浓HCl和NaOH溶液反应的化学方程式:

E2A3与浓HCl反应:______________________________________________________________

E2A3与NaOH溶液反应:___________________________________________________________

(3)取E2A3的HCl溶液,通入D的氢化物,发生复分解反应,析出一种黄色沉淀,其反应的化学方程式为:______________________________________________________________。

答案

(1)Na+2-Na+

(2)As2O3+6HCl====2AsCl3+3H2O

As2O3+6NaOH====2Na3AsO3+3H2O

(3)2AsCl3+3H2S====As2S3↓+6HCl

突破点:A原子结构特点决定A为氧元素,D为硫元素,C为磷元素,B为钠元素,E元素在磷元素以下,为砷元素。

阅读理解

阅读理解。

     It is a hot summer day, and you feel thirsty. A friend gives you a glass of cold lemonade. How do you

feel when you see the glass? Will you describe your feeling as happiness or as pleasure? I believe you will

say it is a feeling of pleasure. There is a connection between these two kinds of feelings, and sometimes

one causes the other, but they are not the same. Pleasure is more dependent on the five senses while

happiness is independent of them.

    When you are happy, little unpleasant events usually do not disturb you. When you are unhappy, you

feel as if everything is against you. You may compensate for it by eating chocolate and sweets because

this gives you pleasure;yet you stay unhappy. A person may smoke cigarettes because it gives him

pleasure, yet, this does not make him happier, especially if he knows the fact that it is not good for his

health.

    The physical world is always in a changing state. At each moment a new thing is being created ,

changed, transformed and then destroyed. This is the normal state of things and no one call change it.

If we stay still in a certain state, we are sure to experience unhappiness sooner or later. On the other

hand, if we adjust to the environment,  nothing can influence our moods. Then outer events have nothing

to do with our inner joy of mind.

    The room of the mind was filled with worry or fear. If you are free of thinking about them, the room

has been emptied,  and then you will see what is happening and experience it When your mind stays

quiet, you will see that happiness comes from the inside.

1.What does the underlined phrase "compensate for" in Paragraph 2 most probably mean?

A. to make a suitable payment for    

B. to let out your anger for

C. to provide with a balancing effect for

D. to solve the problems for

2. According to the passage, in which of the following situations can you feel happy?  

A. A friend gives you a glass of cold lemonade when you feel thirsty.

B. You eat chocolate and sweets when you feel as if everything is against you.

C. Smoke cigarettes even though you know the fact that it is not good for your health.

D. You are free from worry or fear when your mind stays quiet.

3.We can learn from the passage       .

A. happiness is more dependent on the five senses

B. pleasure sometimes arouses happiness

C. you feel happy when nothing around you changes in a certain state

D. you feel unhappy because you have to adjust to the environment

4.Which can be the best title for the passage?

A. Pleasure Leads To Happiness    

B. Happiness Changes Us

C. Happiness Is Within Us

D. Stay A Quiet Mind

单项选择题