用如图所示装置进行实验。完成有关问题： (1)玻璃管E内发生反_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题实验题

用如图所示装置进行实验。完成有关问题：

(1)玻璃管E内发生反应的化学方程式为________________。

(2)C的作用是________________。

(3)广口瓶D内盛的试剂是________，此装置的3个主要作用是________________。

(4)从试管E导出的气体成分是________________。

(5)装置F中U形管观察到所收集的物质的颜色状态是________________。

(6)该实验还缺少一个________装置。

答案

(1)2SO₂+O₂2SO₃

(2)作安全瓶、防倒吸

(3)浓H₂SO₄干燥，使SO₂、O₂充分混合，通过观察气泡控制SO₂、O₂的比例

(4)SO₂、O₂、SO₃

(5)无色固体

(6)尾气吸收

A中反应为：H₂SO₄+Na₂SO₃Na₂SO₄+SO₂↑+H₂O。B中反应为：2KClO₃2KCl+3O₂↑,由此可知E中发生反应为2SO₂+O₂2SO₃，由于此反应为可逆反应，且SO₂、O₂在催化剂表面反应，不可能完全反应，故从E出来的是SO₂、O₂、SO₃的混合气体。

完形填空

Last week I went to a supermarket. After I   36  the bill and was passing through the door, the alarm suddenly started to ring. Suddenly, a young guard ran toward me and ordered me to   37  him. I felt so upset and   38 . He took me to a small room, but I was   39  frightened that I stopped at the door. Finding me   40  to enter the room, he shouted that I had to go into the room.
He closed the door. I thought he was going to hurt me. Suddenly, a   41  voice said in my ear, “Take out the things you've stolen!” “I stole nothing.” I said. “Do as I tell you. If we find them, you’ll be in trouble.” “There is nothing.” I answered. “I didn't take anything.” I said, taking everything out of my pockets and bag.
42  this point, a guard came in and asked a salesgirl to   43  me.   44 , they found nothing.
But they didn't believe that I hadn't stolen anything. So the young guard ordered me to pass through the door alarm again.
I was   45  when it rang again. I felt   46  and burst into tears. I didn't know how to prove   47  I was innocent.
They made me go into the small room again.
“Take out the stolen things quickly,   48  we will dial 110.” They said.
“OK, call the police. I’ m not afraid.” I said   49  .
Suddenly, they   50  their tone. After a while, a salesgirl asked me to raise my feet. I did   51   she had told me. There was a label (标签) on the bottom of my shoe. That was it! That was the   52  thing that had brought me such great trouble. But it 53  my innocence.
After that, they   54  to me in the small room. But they should have apologized   55  , shouldn't they? A lot of people were there when I was taken away. What did they think of me?

C．voluntarily

A．Needless to say

C．On one hand

D．As a result of

C．according to

单项选择题

斜疝和直疝最重要的鉴别点是（）。

A.斜疝呈椭圆形或梨形

B.斜疝肿块常坠入阴囊

C.斜疝多见于儿童和青少年

D.回纳疝块后压住内环，疝块不再突出者为斜疝

E.以手指的插入皮下环，令病人咳嗽后有冲击感者为斜疝