问题 问答题

请认真阅读下列短文,并应用已学过的知识回答问题.氨气(NH3)在通常状况下是一种无色有刺激性气味的气体,密度比空气小,极易溶于水.常温下氨气还能跟酸、氯化钙和CuSO4等物质起反应.实验室常用加热氯化铵和熟石灰两种固体混合物来制取氨气.

(1)指出编号仪器的名称:a______、b______.

(2)实验室制氨气的化学方程式为______,应选用气体发生装置为______.(从A、B中选择填空)

(3)若要制得干燥的氨气,可用______作干燥剂(从“浓硫酸”、“CuSO4”“氯化钙”“碱石灰”中选择填空),干燥气体所用的装置应选择______(从D、E中选择填空).

答案

(1)要熟记常见仪器的名称和用途;

(2)实验室制氨气的反应物是NH4Cl和Ca(OH)2,生成物是CaCl2、H2O和NH3,用观察法配平,氨气后面标上上升符号,反应条件是加热;根据用加热氯化铵和熟石灰两种固体混合物来制取氨气,可知反应条件是加热,所以发生装置选择带有酒精灯的;

(3)由于氨气溶于水形成的氨水属于碱,所以氨气属于碱性气体,不能用酸性物质干燥,可以用碱性物质来干燥,碱石灰显碱性且易吸收水,可以用来干燥氨气,因为碱石灰属于固体所以用E装置来干燥,D装置适合于液体干燥剂.

故答案为:(1)长颈漏斗;U型管;(2)2NH4Cl+Ca(OH)2

  △  
.
 
CaCl2+2H2O+2NH3↑;A;(3)碱石灰;E.

阅读理解

阅读理解

Problem:

I'm bored. We have a day off because of the heavy rain. If you didn't go to school today, what would you do? Why?LindaSome advice:

       If I were you, I would be at home doing something, such as making my bed or helping my mother do

some chores. That way, my room would be clean and my parents would be happy.Tina  I would do what

I love! Maybe I would help Mom do some cooking. I would learn how to make dumplings.Kathy  I don't have enough time in one day to do all the things I want to. People who get bored usually don't have a good imagination (想象力). There are lots of different books to read, websites to surf, people to visit and things to make.June  Well, if I were you, I would watch a good movie and then take a good nap (小睡). Your

brain (脑子) and body will then be relaxed and ready for classes the next day.

根据材料内容,选择最佳选项。

1. What's Linda's problem?

A. She doesn't have a job.

B. She feels bored.

C. She hates rainy days.

D. She feels awful at school.

2. Who would watch a movie if she had a day off?

A. June.

B. Kathy.

C. Lisa.

D. Tina.

3. What would Kathy probably like to do on her day off?

A. She would like to cook.

B. She would like to sleep.

C. She would like to read.

D. She would like to watch TV.

4. June would do all of the following EXCEPT      . 

A. visit friends

B. surf the Internet

C. read books

D. lie in bed

5. What do we know from the reading?

A. Tina doesn't like to do any housework.

B. Kathy likes to do the same things as Tina.

C. Lisa thinks it would be helpful to Linda to get relaxed.

D. June used to be busy, but now she has enough time to relax.

名词解释