问题 实验题

某兴趣小组利用下列装置进行实验室制取和收集气体的实验,请回答:

(1)若要用过氧化氢制取氧气,应选用_______ (填“A”或“B”),在气体发生装置中可加入的固体物质是________ (写化学式),反应的文字表达式为 _______________。

(2)若用高锰酸钾加热制取氧气,应选用的气体发生装置是________ (填“A”或“B”),反应的文字表达式为 _________________。

(3)若用F装置收集去氧气,则气体从________端进入。若在装置中充满水,则O2应由    口进入(填“a”或“b”)。

(4)若B装置中装有石灰石和盐酸,则该装置可用于制取________ (写化学式)。反应的文字表达式为_______________ 。

(5)如果用装置E来收集氧气,实验完毕后应注意先________,再________,原因是_____________。

(6)如果用装置D来收集二氧化碳,怎样验证集气瓶内气体是否已收满?简述操作过程.现象及其结论 _____________________________________。

答案

(1)A;MnO2;过氧化氢水+氧气

(2)B;高锰酸钾锰酸钾+二氧化锰+氧气

(3)a;b

(4)CO2;碳酸钙+盐酸→氯化钙+二氧化碳+水

(5)撤导管;移酒精灯;防止水槽中的水顺导管流入试管炸裂酒精灯

(6)将燃着的木条放在瓶口,如果木条熄灭,证明二氧化碳已收集满

阅读理解

"What’s in a name?”According to Shakespeare’s Romeo and Juliet,there is not too much.“That which we call a rose by any other name would smell as sweet. "But Shakespeare may have been wrong. In most cultures,names matter a great deal.

Americans choose names for their children with care. Parents usually think about the impression a name gives,not its meaning. Most Americans would consider a “Jennifer” more attractive than a“Bertha",for example. The last name,or,surname,must also be considered when choosing a first and middle name. A name like Lester Chester Hester would sound poetic,but odd. Parents would avoid names that remind them of people they don’t like. On the other hand,people might name their children after a respected elderly relative or even a famous person. The popularity of certain names can change with each new generation. Names that were once common,like Fanny or Elmer,sound old-fashioned today. But other names—like John and David,Mary and Sarah—have stood the test of time and continue to be favorites.

People in Ameica don’t always call their friends and relatives by their given names. Instead,they often use nicknames. Sometimes nicknames are short forms of a longer name. For instance,a girl named Elizabeth may be called Lisa,Beth or Betsy. As children grow up,they may decide for themselves which nickname they wish to be called.

Some people just go by the initials of their first and middle names,like B. J, or R. C. And of course,people may call their children or their sweethearts other special nicknames. Often they have a “sweet” flavor,like Honey or Sugar. What’s in a name? A world of significance. So if you’re choosing an English name for yourself,take care to choose a good one. A made—up name could sound strange to native English speakers. And a translation of your Chinese name may not make an appropriate name,either. But a good name can leave a positive and lasting impression.  As an American politician once said,“In real life,unlike in Shakespeare,the sweetness of the rose depends upon the name it bears.”

小题1:What does the underlined sentence in Paragraph 2 mean?

A.People change names in order to be popular with the new generanon.

B.Names will change by themselves in order to be popular.

C.Some names may no longer be popular among the new generation.

D.No names can stand the test of time.小题2:When choosing names,you should stick to the following principles EXCEPT that

A.the impression a name gives is more important than its meaning

B.you can name after a well-known person

C.surname should be paid attention to

D.you can create a name that is special小题3:The author will name a newly born baby girl________.

A.Bertha

B.Fanny

C.Yunyun

D.Elizabeth小题4:What is the main idea of this passage?

A.Names have great significance to Americans.

B.Names change when time goes by.

C.Chinese people should be careful when choosing their English names.

D.Roses smell sweet by any other name.

问答题 简答题