问题 填空题

硫酸是工业生产中最为重要的产品之一。

(1)工业上制硫酸主要分为_________、__________、__________三个阶段。

(2)下列是第二阶段反应的有关实验数据,请选择最合适的生产条件_______________。

(3)现欲提高反应速率和SO2的转化率,下列措施可行的是_________(填序号)。

A.向装置中通入氮气且保持体积不变

B.向装置中通入氧气且保持体积不变

C.添加更多的催化剂

D.降低温度,及时转移SO3

(4)硫酸生产的尾气中含有少量SO2,可用石灰水吸收后,再用硫酸处理。此过程涉及的化学反应方程式为_______________________、___________________。

(5)若进入第二阶段,设备中气体的体积分数为7%SO2、11%O2、82%N2。现有100体积这样的混合气体在反应后变为96.7体积,则反应后混合气体中N2和SO3的体积比为______,此时SO2的转化率为______。

答案

(1)造气;催化氧化;吸收

(2)400℃、0.1MPa(或常压)

(3)B

(4)SO2+Ca(OH)2=CaSO3↓+H2O;CaSO3+H2SO4=CaSO4+SO2↑+H2O

(5)410:33(或82:6.6);94.3%

阅读理解

阅读理解。

     Harry is from London. He is now in China with his parents. He is thirteen years old. He is a student of

 Grade Seven.

    Harry is a clever student. He works very hard. He is good at all his lessons. He says he likes Chinese

 best. He speaks some Chinese now. All his teachers like him. They say he is a good student.

    Harry gets up at six twenty on weekdays. He has his breakfast at home. After breakfast. he walks to

  school. His school is about half a kilometer (公里) from his home. School begins at seven fifty every day.

  In the morning. they have four classes.

     Harry has lunch in the dining hall with his classmates. He usually has a short rest (休息) after lunch.

 They have three classes in the afternoon. And school is over at four forty.

   After school,Harry plays ball games in the playground. He goes home at about five thirty. He has a big

  supper every day. In the evening. he does his homework and watches TV. And then he goes to bed at

 nine thirty.

    Harry says he likes living in China very much. "The people here are friendly and the food is nice. I like

  all the things here. "He says to his parents.

1. Harry is a boy from _____.

    A. the USA        

    B. China          

    C. England          

    D. Japan

2. Which subject does Harry like best?

    A. English        

    B. Chinese        

    C. math            

    D. ball games

3. What time does Harry get up in the morning?

    A. At six ten      

    B. At seven fifty    

    C. At six            

    D. At six twenty

4. Where does he usually have lunch?

    A. At home        

    B. At school      

    C. At a restaurant    

    D. We don't know

5. What does he like in China?

    A. The people      

    B. The food        

    C. All the things      

    D. We don't know

单项选择题