问题 实验题

某化学兴趣小组为探究SO2的性质,按下图所示装置进行实验。

请回答下列问题:

(1)装置A中盛放亚硫酸钠的仪器名称是_______,其中发生反应的化学方程式为___________________。 (2)实验过程中,装置B、C中发生的现象分别是_______、___________这些现象分别说明SO2具有的性质是 __________和__________ ;装置B中发生反应的离子方程式为_______。

(3)装置D的目的是探究SO2与品红作用的可逆性,请写出实验操作及现象_______。

(4)尾气可采用_________ 溶液吸收。

答案

(1)蒸馏烧瓶;Na2SO3+H2SO4(浓)=Na2SO4 +SO2↑+H2O

(2)溶液由紫红色变为无色;无色溶液中出现黄色浑浊;还原性;氧化性;

5SO2+ 2MnO4-+2H2O==2Mn2++5SO42-+4H+

(3)品红溶液褪色后,关闭分液漏斗的旋塞,点燃酒精灯加热,溶液恢复为红色

(4)NaOH

阅读理解

Zhao Hua is a student from a university. He has led a group of university student volunteers since last year. They help children at a primary school with their studies and daily lives.

"When I was a small child," Zhao said, "I knew March 5th was a day for people to learn from Lei Feng and help others, but I didn't know the real meaning of the spirit(精神) of Lei Feng. Now when I see the smiling faces of the kids I have helped, I deeply understand Lei Feng. Helping others makes me happy.,'

Lei Feng (1940-1962) is one of the best-known soldiers in Chinese history. He lost his parents when he was very young. His neighbors brought him up. He died in an accident at the age of 22. He did many good deeds in his short life. For example, he gave his own money to the parents of another soldier, and bought a ticket for a woman he didn't know without telling her his name.

On March 5th, 1963, Chairman Mao called on people to "Learn from Lei Feng" and made the day "Lei Feng Day".

Today almost 50 years has passed since Lei Feng's death. Some people say that the spirit of Lei Feng is out. There have been many reports about the coldness(冷漠)of people towards strangers. This has made many Chinese people think deeply about themselves.

Many people think We need to promote(提倡) that spirit again. The important thing is that we must be ready to help others and make it a habit.

根据短文内容,选择正确答案,并将其字母代号填入答题卷或填涂在答题卡相应位置。

(共5小题,每小题2分,满分l0分)

小题1:Which day is "Lei Feng Day"?

A.May 3rd

B.May 5th

C.March 3rd

D.March 5th小题2:Who brought Lei Feng up?

A.His parents

B.Chairman Mao

C.His neighbors

D.Soldiers小题3: The underlined phrase "good deeds" means __ in Chinese.

A.好人

B.好事

C.好梦

D.好主意小题4:Which of the following is NOT TRUE according to the passage?

A, Lei Feng gave his money to another soldier's parents.

B. Lei Feng bought a ticket for a woman and he told his name to her.

C, Lei Feng always helped others.      "

D. We should learn from Lei Feng,

小题5:What's the best title(标题) of this passage?

A.Lei Feng Spirit

B.Lei Feng's Death

C.Lei Feng's Good Neighbors

D.University Student Volunteers

单项选择题