问题 问答题

(1)若用如图1装置加热高锰酸钾制取氧气,请指出装置中的一处错误______.写出标号仪器①和②的名称分别是______;氧气验满的方法是______.

(2)写出高锰酸钾制取氧气的文字表达式______.

(3)实验结束,停止加热时要先把导管移出水面的理由是:______.

(4)小明同学希望采用分解过氧化氢的方法制取氧气,进而设计了如图2所示的装置,该实验装置的优点是:______.

答案

(1)加热高锰酸钾制取氧气时试管口要放一团棉花,防止加热时高锰酸钾粉末进入导管,装置中没有;标号仪器分别是试管和集气瓶;检验氧气是否收集满的方法是:将带火星的木条放于集气瓶口,观察是否复燃;

(2)高锰酸钾加热生成锰酸钾、二氧化锰和氧气,表达式是:

(3)停止加热时要先移导管,是为了防止试管内温度降低,压强减小,水倒吸入试管引起热的试管炸裂;

(4)分液漏斗可以控制液体的滴加速度,从而达到控制反应速率的目的;

故答案为:(1)试管口未放棉花;试管和集气瓶;将带火星的木条放于集气瓶口,若木条复燃则满;

(2)高锰酸钾

加热
锰酸钾+二氧化锰+氧气;

(3)防止试管内温度降低,压强减小,水倒吸入试管引起热的试管炸裂;

(4)可控制反应速率(合理均可).

阅读理解

Welcome to Franklin Hotel! We will make your stay here as enjoyable as possible. We hope we will give you the best service.

★Room Service: You can use the service 24 hours a day.

★Dining Room: You can have three meals a day in the dining room. Breakfast is from 8:00 to 9:30. Also the room waiter may bring breakfast to your room at any time after 7:00 . If you need, please fill in a card and hang it outside your room before 6:00. Lunch is from 12:00 to 14:00. Dinner is from 18:30 to 20:30.

★Telephone: There is a telephone in your room. Dial “0” before you make a call. We will tell you to wait a moment if the lines are busy.

★Shop: The hotel shop is open from 9:00 to 17:30.

★Coffee House: You can drink coffee here at the following times: 12:00 to 14:00, 20:00 to 23:30.

★Another Service: There is a cinema in the hotel. A film begins at 19:00 on Sundays and Wednesdays.

小题1:When can you use the room service?

A.Only the daytime.

B.Only at night.

C.Anytime during a day.

D.Only some time.小题2:If you want to have a meal in your room, what will you do?

A.Phone the service desk.

B.Go to the hotel shop to buy some food.

C.Go to the hotel dining room.

D.Put a message outside the room.小题3:What will you do if the telephone lines are busy?

A.We will ask the service center for help.

B.We will cut off the phone.

C.We will wait a moment.

D.We will use the pay phone.小题4:If you want to have a two-hour business talk in the coffee house, you may go there at_____.

A. 12:00            B: 1:00          C. 10:00            D.11:30

小题5:The instructions tell us that you can__________.

A.go shopping at anytime in the hotel

B.get at least six services

C.see a film when you want to

D.go to the coffee house twice a week.

简答题