题干

某研究性学习小组利用下列装置进行气体的制取实验,请分析回答下列问题:

(1)指出图中标有数字的仪器名称①____ ,②____ .

(2)实验室用高锰酸钾制取氧气时应选用的发生装置是____ (填字母标号,下同),写出该反应的化学方程式____  .在用足量的高锰酸钾制取氧气的过程中,氧气产生的速率逐渐减慢,此时应该进行的操作是____.

(3)实验室制取二氧化碳选择的发生和收集装置是 ____ ,若要制取一瓶干燥的二氧化碳,需要用装置F,气体应从 ____  端通入(填“a”或“b”).

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答案(点此获取答案解析)

\u957f\u9888\u6f0f\u6597,\u96c6\u6c14\u74f6,A,2KMnO4=\u25b3K2MnO4+MnO2+O2\u2191,\u5c0

同类题3

   Here is a 2-way student exchange. Fred, 19 , spent last year in Germany with George’s family. In turn, George’s son Mike spent a year in Fred’s home in America.
   Fred knew little German when he arrived. But after 2 months of studying, the language became easy for him. School was very different from what he had looked forward to and it was much harder. Students stood up politely when the teacher came into the room. They took 14 subjects while American students usually took 6 in the US.
   Family life, too, was different. The father’s word was the law(法律) . All the children had to do their activities with their family. Fred also missed having a car. In Germany, you should walk to go out to have a good time.
   At the same time, in America, Mike was forming his own ideas. He says,’ American schools are too easy for our level but I have to say that I like it a lot in Germany , we do nothing except study. Here we take part in many other activities.

Differences between American school life and German school life
ItemsAmerican studentsGerman students
Class rulesThey don’t have to stand up when their teacher come inThey have to ____  up and show respect(尊敬) to their ____ 
____  lifeThey do their own things alone.They have to listen to their ____ 
School ____ They have six and they are very easy for themThey have 14, but the lessons are much more ____ 
Going outThey can____  carsThey have to ____  all the way
School activitiesThey have ____  other activitiesThey have to ____  hard all the time.