问题 实验题

实验室可用下图所示装置(缺少收集装置,夹持固定装置略去)制备并探究氨气性质。查阅资料得到氨气的一些性质:无色、有刺激性气味的气体,比空气轻;易液化得液氨;极易溶于水。

(1)将熟石灰与氯化铵混合加热可以用于制备氨气,请从上图中选择装置               用于制备该气体,试管中的化学反应是(填写化学方程式)                                                   ,若采用装置D来收集氨气,气体应从                      端进入。

(2)装置C 能够形成红色的喷泉,这说明了氨气具有                                   的性质。

(3)实验室模拟合成氨的实验中,先将氮气和氢气通过E装置,E装置的作用除了使氢气和氮气气流稳定以及使气体充分混合外,还有                              的作用;装置F用于合成氨,铂丝作为催化剂可反复使用,这是因为                             

答案

(1)A;Ca(OH)2+2NH4ClCaCl2+2H2O+2NH3↑;2

(2)易溶于水;水溶液显碱性

(3)干燥气体或吸收水;反应前后质量和化学性质均不变

阅读理解

The video rooms have been open since Jan. 2. If successful, the chain hopes to expand the service to other provinces, or even other countries. In addition to the food, customers pay 200 yuan per hour for using the room.

''The video rooms have been fully booked in February,'' said Chen Yu, manager of the Wangfujing branch. The Video room in Beijing is about 30 square meters and large enough for six customers.

''Many customers prefer to use the room for dinners rather than lunch,'' Chen said, adding the average age of customers who booked the video hotpot(火锅) is about 30.

''The whole process is very smooth. The image and the voice transmission(转换) are as good as those of video conferencing at work, ''said one of Chen's colleagues surnamed Luo.

''I have a lot of friends in Beijing, whom I haven’t met for a long time because of being busy at work,'' said a woman surnamed Yu who is having dinner with her husband at Haidilao.''The new service gives us a chance to have a dinner together without traveling. I would like to give it a try.''

The video hotpot also helped establish a friendship between waitresses in the two cities.

Zhao Huanhuan, in her 20s, who is specially trained for serving in the video room in Shanghai, developed a friendship with a waitress named Lu Ke in the Beijing branch.

Zhao said excitedly: ''It was too amazing to believe. I'm so interested in using the special room and enjoy serving people there. I also talk about some interesting interactive games with Lu before guests come for dinner''.

Although Lu felt a little bit nervous when she first served in front of the screens, she said the new mode of communication also encouraged her to supply better services for customers.

''It's like a service competition. We saw each other through video and I could learn from Zhao's serving,'' Lu said, adding she will visit Zhao if she goes to Shanghai.

It seems that video hotpot doesn't satisfy everyone's taste, however.

小题1:From the passage we know that ______.

A.the video room service has been open for a long time

B.the video room service has been open in many provinces in China

C.using the video room, you have to pay extra 200 yuan per hour

D.the Video room in Beijing is only designed for six people to use小题2:Haidilao may be the name of ______.

A.a theatre

B.a restaurant

C.a cinema

D.a hotel小题3:Why do many customers choose the video room service?

A.Because the service there is excellent.

B.Because they can have dinner with friends without traveling.

C.Because the food there is delicious.

D.Because the room is large enough for six people.小题4:We can learn from the passage that Zhao Huanhuan ______.

A.enjoys communicating with Lu Ke

B.hasn't met Lu Ke for a long time

C.is twenty years old now

D.learned a lot from Lu Ke小题5:What do you suppose will be talked about in the paragraph to be followed?

A.Lu's visit to Zhao in Shanghai.

B.Other customers' praise for the service.

C.How to improve the service.

D.Other customers' complaint about the service.

单项选择题