问题 填空题

根据下图所示装置回答问题:

(1)写出下列仪器的名称:①                 , ②                   

(2)用氯酸钾制取氧气,选择的发生装置是       ,反应的化学方程式为      

(3)实验室若用B装置制取二氧化碳,反应的化学方程式为             ,若用G来收集二氧化碳,二氧化碳应从    (选“a”或“b”)进,制取二氧化碳最好选择的发生装置是      (选择“B”或“C”),与另一个装置相比,其优点是          

(4)通过查阅资料得知:①氨气(NH3)是一种密度比空气小且极易溶于水的气体,其水溶液称为氨水;②氨气在加热条件下能与氧化铜反应生成铜、水和空气中含量最多的气体,化学中用加热氯化铵和氢氧化钙的固体混合物制取氨气。则制取氨气应选择的装置组合是

      (填装置编号),请写出氨气和氧化铜反应的化学方程式                   

答案

(1)①试管,②集气瓶。

(2)A,2KClO32KCl + 3O2↑。

(3)CaCO3 + 2HCl ="==" CaCl2 + H2O + CO2↑,a ,C,能随时控制反应的发生与停止。

(4)AE(或AG),2NH3+3CuO  3Cu+3H2O+N2

1)根据常用仪器的名称和用途可知两仪器分别为:试管、集气瓶;

(2)氯酸钾在二氧化锰作催化剂,加热的条件下生成氯化钾和氧气,属于“固体加热型”;方程式为2KClO32KCl + 3O2↑;

(3)实验室制取二氧化碳用石灰石和稀盐酸混合反应生成氯化钙、水和二氧化碳,二氧化碳的密度比空气大,所以应从a进,制取二氧化碳发生装置B和C都可以,但C装置更优良,能随时控制反应的发生和停止,B则不行;

故答案为:CaCO3+2HCl=CaCl2+H2O+CO2↑;a;C;能随时控制反应的发生与停止;

(4)用加热氯化铵和氢氧化钙的固体混合物制取氨气,所以选择发生装置是A,氨气的密度比空气小,可用向下排空气法收集,若用G收集,气体应从b进,氨气在加热条件下能与氧化铜反应生成铜、水和氮气,方程式是2NH3+3CuO  3Cu+3H2O+N2

故答案为:AE(或AG),2NH3+3CuO  3Cu+3H2O+N2

单项选择题
阅读理解

阅读理解。

     Tom arrived at the bus station quite early for the London bus. The bus for London would not leave until

five to twelve. He saw a lot of people waiting in the station. Some were standing in lines, others were walking

about. There was a group of school-girls. Their teacher was trying to keep them in order. Tom looked around

but there was nowhere for him to sit.

     He walked into the station café. He looked up at the clock there. It was only twenty to twelve. He found

a seat and sat down, facing a large mirror on the wall. Just then, John, one of Tom's friends, came in and sat

with Tom.

     "What time is your bus?" asked John.

     "Oh, there is plenty of time yet," answered Tom.

     "Oh, I'll get you some more tea then," said John.

     They talked while drinking. Then Tom looked at the clock again.

     "Good heavens! It's going back-ward!" he cried. "A few minutes ago it was twenty to twelve and now it's

half past eleven."

      "You are looking at the clock in the mirror," said John.

      Tom wanted to kick himself for being so foolish. The next bus was not to leave for another hour. He has

never liked mirror since then.

1. The London bus left _____. [ ]

A. at 11:55

B. at 5:12

C. at 4:48

D. at 12:05

2. Tom walked into the station café because _____. [ ]

A. John asked him to have a cup of tea

B. he wanted a drink there

C. he would meet a friend of his

D. it was early yet and he could find a place to sit

3. When we look at a clock in the mirror we'll see _____. [ ]

A. the right time

B. it is going slower

C. it is going backward

D. it is going fast

4. Which of the following is true? [ ]

A. Tom missed his bus.

B. He liked mirror even before.

C. The next bus would leave soon.

D. Tom arrived London on time.