问题 问答题

通过半年的学习,你已经掌握了实验室制取气体的有关规律,请你结合下列装置图回答问题:(友情提示:所选装置均填序号)

(1)实验室制取和收集CO2气体时应选用______和______两装置相连接,检验集气瓶中CO2是否收集满的方法是______

(2)实验室用KMnO4制取O2时,可选用的发生装置是______;用排水法收集O2完毕后,停止实验时的操作顺序是______.

(3)能用E装置收集的气体应具有的性质是______.

答案

(1)实验室可以使用过氧化氢和二氧化锰的混合物制取氧气,这是固液常温型反应,实验室使用石灰石和稀盐酸制取二氧化碳,这是固液常温型反应,故都可以选择的发生装置是B,氧气和二氧化碳的密度都比空气大,可以使用向上排空气法收集,都可以使用C装置收集,检验二氧化碳是否收集满的方法是把燃着的木条放在集气瓶的口部,观察木条是否熄灭,故填:B,C,将燃着的木条放在集气瓶口,观察木条是否熄灭;

(2)实验室使用高锰酸钾制取氧气时需要加热,此反应是固体加热型,使用A装置制取,用排水法收集O2完毕后,为防止水槽中的水倒吸,引起试管破裂,故停止实验时的操作顺序是先将导管从水槽中移出再熄灭酒精灯,故填:A,先将导管从水槽中移出再熄灭酒精灯;

(3)E装置是排水法收集气体,能使用该装置收集的气体需要具备不易溶于水且不能与水反应的性质,故填:不易溶于水且不与水发生化学反应.

阅读理解

Nodira, 18, lives in the Tashkent region of Uzbekistan. She was born with a rare disease and is now paralyzed(瘫痪) from the waist down. Her life is confined to a wheelchair but her dreams know no such boundaries. Her hopes for the future include attending university, riding in her father’s car and being able to walk like other children.

Nodira, which means ‘unique’ in Uzbek, is one of five children in a poor family. Every morning, after reciting her prayers, Nodira feeds the hens and goats from her wheelchair. The rest of her day is spent knitting for other people and helping her mother with the household chores.

Nodira has never been to school because it is too far from her home and inaccessible for her wheelchair. A local teacher used to come and tutor her at home and, as a result, she was able to finish third grade. After that, her parents moved to another town and the tutor could not visit as much.

Despite the many difficulties in Nodira’s life she is lucky to be living with her family. The stigma(羞辱) attached to the children living with disabilities, combined with the lack of wheelchair access in schools and the economic difficulties faced by many Uzbek families, have led many parents to place children with disabilities in special institutions.

These days, Nodira does homework exercises at home and reads as much as she can. Still, it is unlikely that she will be able to finish her primary education, much less attend university. While missing out on an education is a great disappointment to Nodira, her greatest wish, for a true friend, can still come true. “What I want more than anything is a friend who also has a disability,” she says. “Somebody will not feel sorry for me or make fun of me, and will understand what my life is like.”

小题1:The underlined sentence in the first paragraph probably means “_____”.

A.her dreams will help her desert her wheel chair

B.her dreams are never limited by her disability

C.she often dreams of moving freely without a wheel chair

D.she never dreams of recovering from her disability小题2:Nodira does all the following every day EXCEPT _____.

A.give food to some animals

B.to make clothes from woolen or cotton thread

C.drive cars designed for the disabled

D.help with the housework小题3:The underlined word “tutor” in the 3rd paragraph can be replaced by “_____”.

A.educate

B.visit

C.treat

D.comfort小题4:What Nodira wants most is ______.

A.to go to university

B.to walk on her own feet

C.to finish her primary education

D.to find a true friend

单项选择题