问题 填空题

完成下列方程式(24分)

(1)实验室制氯气              (2) 实验室制氨气

(3) 制漂白液                   (4) 过量的铁与稀硝酸反应

(5) 过氧化钠与二氧化碳反应   (6)铝与氢氧化钠溶液反应

(7)氨气的催化氧化          (8)向氯化铁溶液中加入铜

(9)碳与浓硫酸反应          (10)制粗硅

(11)氯化亚铁溶液通氯气     (12)氢氧化铝溶于氢氧化钠溶液

答案

(1)实验室制氯气  MnO2+4HCl(浓)=△=MnCl2+2H2O+Cl2

(2) 实验室制氨气     2NH4Cl+Ca(OH)2=△=CaCl2+2NH3↑+2H2O

(3) 制漂白液   Cl2+2NaOH===NaCl+NaClO+H2O

(4) 过量的铁与稀硝酸反应  3 Fe + 8 HNO3  ="3" Fe (NO3)2 +2NO↑+4H2O

(5) 过氧化钠与二氧化碳反应  2 Na2O2 + 2CO2=2Na2CO3 +O2

催化剂

 
(6)铝与氢氧化钠溶液反应  2Al +2H2O+2NaOH =2NaAlO2 +3H2

(7)氨气的催化氧化  4NH3+5O2===  4NO+6H2O

(8)向氯化铁溶液中加入铜   2 FeCl3 +Cu = 2FeCl2 + CuCl2

高温

 
(9)碳与浓硫酸反应  C+ 2H2SO4(浓) =△= CO2↑+2SO2↑+2H2O

(10)制粗硅  SiO2 +2C  =   Si +2CO

(11)氯化亚铁溶液通氯气 2FeCl2+Cl2=2FeCl3

(12)氢氧化铝溶于氢氧化钠溶液  Al(OH)3+NaOH=Na[Al(OH)4]+3H2

(4)先: Fe + 4HNO3  =" Fe" (NO3)3 +NO↑+2H2O

后:Fe + 2Fe (NO3)3=" 3Fe" (NO3)2    答案中为总反应

阅读理解

阅读理解。

     Jack was ten years old and he was a very lazy boy. He didn't like doing any work. He had to go to

school, of course, but he didn't study hard there and tried to do little work. His father and mother were

both doctors and they hoped that their son would become one too when he grew up. But one day Jack

said to his mother, "When I finish school, I want to be a dustman (垃圾工)."

     "A dustman?" his mother asked. She was very surprised. "That's not a good job. Why do you want

to become a dustman?"

     "Because I would only have to work one day a week," Jack answered at once.

     "Only one day a week?" his mother said. "What do you mean? And how do you know?"

     "Well," Jack answered, "I know that the dustmen came to work on Thursday every week, because

I only see them on that day."

1. How was Jack doing at school? [ ]

A. He liked his school.

B. He worked hard at school.

C. He didn't study hard at school.

D. He tried to do much work at school.

2. Jack's parents wanted their son to be a            . [ ]

A. doctor

B. dustman

C. teacher

D. worker

3. Jack hoped to be a dustman because he thought            . [ ]

A. that job was very important

B. the dustman worked only Thursday

C. he could make more money

D. that was a dirty job

4. Jack's mother felt surprised at his hope of being a dustman, because            .[ ]

A. their son was too young to be a dustman

B. a dustman worked only one day a week

C. it was hard to get such a job

D. that was not a good job

5. What do you think of Jack? [ ]

A. He was not very clever.

B. He was very lazy.

C. He liked the dustman's work.

D. He didn't want to be a doctor.

单项选择题