问题 实验题

下图所示装置为铜跟浓硫酸反应制取二氧化硫的实验装置,请回答下列问题:

(1)在装置A中放入有关药品后,打开活塞K,将分液漏斗中的液体加入烧瓶中,关闭分液漏斗的活塞,点燃酒精灯,烧瓶中反应的化学方程式为__________________ ________。

(2)装置D中试管口放置的棉花中应浸有一种液体,这种液体是______________溶液,其作用是_________________________________________。

(3)装置B的作用是贮存多余的二氧化硫和防止其污染环境,则B中应盛放的液体是(填写字母代号)________。

A.水

B.浓溴水

C.酸性KMnO4溶液

D.饱和NaHSO3溶液(4)若用该套装置制备H2S(不用酒精灯),则A中发生反应的化学方程式是________ ____________________________,B中应加入的最合理的液体是____________,D中为检验硫化氢盛放的溶液是_______________。

答案

(1)Cu+2H2SO4(浓)CuSO4+SO2↑+2H2O  (2分)

(2)NaOH溶液(碱溶液)  (1分)   吸收多余的SO2气体 (1分)

(3)D  (2分)

(4)FeS+H2SO4(稀)  FeSO4+H2↑ (2分) 饱和NaHS溶液   (1分)

CuSO4溶液(合理答案均可) (1分)

题目分析:(1)在加热的条件下浓硫酸和铜反应生成SO2、硫酸铜和水,反应的化学方程式应该是Cu+2H2SO4(浓)CuSO4+SO2↑+2H2O。

(2)SO2是大气污染物,应该有尾气处理,则棉花中应该含有氢氧化钠溶液,用来吸收多余的SO2气体,防止污染空气。

(3)SO2易溶于水,且具有还原性,能被溴水和酸性高锰酸钾溶液氧化,所以收集SO2应该用饱和的亚硫酸氢钠溶液,答案选D。

(4)实验室制备H2S的反应式是FeS+H2SO4(稀)  FeSO4+H2↑,收集H2S最好选择的是饱和NaHS溶液。H2S能和硫酸铜溶液反应生成黑色沉淀CuS,所以检验硫化氢放热试剂是硫酸铜溶液。2、H2S的制备、收集、性质检验以及尾气处理

点评:该题以常见气体的制备为载体,重点考查学生对化学实验原理、操作等熟悉了解程度,旨在考查学生灵活运用基础知识解决实际问题的能力。该类试题主要是以常见仪器的选用、实验基本操作为中心,通过是什么、为什么和怎样做重点考查实验基本操作的规范性和准确性及灵活运用知识解决实际问题的能力。

阅读理解
采访中有5处需要添加信息。请从以下选项中(A, B, C, D, E和F)中选出符合各段意思的选项。选项中有一项是多余的。
A.Do established musicians have a responsibility to guide and assist young up-and–coming musicians?
B.Did anyone promote your musical education when you were growing up?
C.What kind of “world music” do you enjoy?
D.What’s your comment on pop music?
E.Does the contemporary music press give jazz the coverage it deserves?
F.What’s wrong with the music on the radio?
An interview with Wynton Marsalis, a noted jazz musician
小题1:_________________________________
There were the older jazz musicians who hung around our house when I was young.I saw how much they practiced, how serious they were about their art.I knew then I had to work just as hard if I wanted to succeed.Of course, my father inspired me a lot, and many teachers took the time to nurture my talent and the talents of other students in our school.
小题2:_____________________________
Yes.We’ve done such a poor job with music education because, as a society, we haven’t maintained the kind of education that a true artist and musician needs.Young people haven’t been able to equate romance and talent with music.For instance, most of the people who make it in the music industry today have to look good.How they sound is secondary.Sarah Vaughan, Bessie Smith, Ella Fitzgerald — those big, romantic queens of jazz music wouldn’t make it in today’s music industry, and that’s a shame.We need to teach young people about the alternatives.
小题3:______________________________
Around the world people make music that, if you listen carefully to it, sounds a little like the cadence of their language.I’d call it folk music.When I’m away from home, I make a point of listening to regional folk music, not what’s on the radio.
小题4:_______________________________
The same music is on the radio all over the world, and the American sound is overwhelming.Even the pop music that’s produced and created in foreign countries has that American beat, which underscore funk.As a musician, I’m not interested in hearing recycled versions of the same genre over and over.Any music that doesn’t have a development section just isn’t interesting to me.
小题5:_________________________________
The music press has so much to introduce these days, and jazz is just a small fraction of it.Because some people are intimidated by jazz, they don’t cover it unless it’s a big name.New jazz musicians don’t get much of break.A lot of editors don’t say anything about jazz these days unless it’s Marsalis.That’s a shame.What VH1 is doing with their Save the Music campaign is phenomenal.They’re getting all these instruments out to needy kids.It’s the kind of thing all networks should be doing.
单项选择题