问题 实验题

某校化学兴趣小组的同学利用下图所示装置进行实验。

实验目的:

①粗略测定加热2g高锰酸钾样品所收集到的氧气体积。 

②用制取的氧气,进行细铁丝在氧气中燃烧的性质实验。

(1)仪器认识:写出仪器①②的名称:①             ;②           

(2)反应原理:(用化学方程式表示)高锰酸钾制氧气:                                    ;细铁丝在氧气中燃烧:                                           

(3)装置连接:各装置的接口连接 a→(   )→(   )→f。 

(4)问题分析: ①在测量生成氧气体积的实验中,小组同学先加热A装置,将装置中空气排尽,然后正确连接各装置的接口。请判断这样操作是否合理:   (填“是”或“否”)。实验结果发现,测得生成氧气的体积小于计算所得的数值。请写出导致实验结果误差的一点原因                                        

②在进行细铁丝在氧气中燃烧的性质实验时,集气瓶发生破裂。请分析产生这一结果的可能原因                                (写出其中一点)。

答案

(1) ①试管 ②量筒

(2)2KMnO4K2MnO4+MnO2+O2↑ ;3Fe+2O2Fe3O4

(3) c ;b

(4)①否; 装置漏气或高锰酸钾的量不足等; ②集气瓶底部没有放少量的水或细沙

阅读理解

A shop worker nicknamed(绰号) Little Fatty told of his shock at becoming a Susan Boyle-like Internet star after a perfect Whitney Houston performance on a TV talent(才能)show. Lin Yuqun, 24, won over the judges and the audience of the Million Star show with perfect performances of Whitney Houston’s I will Always Love You , and has got 480,000 hits on video sharing website You Tube.

“I am shocked that I can draw so much attention. I'm really moved and happy that people like my performance of Whitney's song,” said Lin, who works part-time at a musical instrument shop. “I've loved singing since I was a little boy and I feel like I am living my dream now. I hope I can pursue(追求) a career in singing,” he told reporters.

Reporters called him “China’s Susan Boyle”, describing him as “plain-looking and short”, but Lin, who has the nickname “Little Fatty”, told reporters the comparison made him proud. “I am honoured to be compared to Susan Boyle. I am inspired and encouraged by her because she proved that even a person who's seen as an underdog(弱者) and who has ordinary looks can shine on the stage,” Lin said.

Since his performance was posted on Youtube late last week, he has been the subject of heated conversation in on-line chat rooms on American Yahoo! and other foreign websites. “Lin really is amazing. Whitney couldn’t do it any better today, ” a viewer wrote on YouTube.

Scottish single Susan Boyle got recognized around the world after she was discovered last year on the British’s Got Talent television show with her performance of I Dreamed a Dream from Les Miserables, which was the best-selling debut(首演)in British chart history and also topped the US charts.

小题1:What do we know about Lin Yuqun?

A.He has a great talent for singing.

B.He works quite hard as a shop owner.

C.He sings better than Susan Boyle.

D.He likes watching TV best.小题2:It seemed that Lin Yuqun _________.

A.was not surprised that he could be famous.

B.felt lost after the talent show.

C.learnt to sing at a musical instrument shop.

D.wants to become a singer.小题3:Why does Lin Yuqun speak highly of Susan Boyle?

A.Because she is as ordinary as him.

B.Because she is a famous singer now.

C.Because he gets confidence from her.

D.Because she brings good luck to him小题4:By saying “Whitney couldn’t do it any better today”, the viewer means __________.

A.Whiteny doesn't sing well any longer.

B.Lin Yuqun sings as well as Whitney

C.Lin Yuqun has gone beyond Whitney

D.Lin Yuqun can develop his singing better小题5:On a website, you may read the article in the column of _________.

A.education.

B.fashion

C.science

D.Art

多项选择题