试题与答案

“嫦娥一号”飞船的成功发射是我国航天事业的又一里程碑.金属过氧化物等可作宇宙飞船

题型:问答题

题目:

“嫦娥一号”飞船的成功发射是我国航天事业的又一里程碑.金属过氧化物等可作宇宙飞船或潜水艇中的氧气再生剂,如:过氧化钠(Na2O2)在常温下能与人呼出的二氧化碳反应生成氧气,化学方程式为:2Na2O2+2CO2═2Na2CO3+O2;(过氧化钠还能与盐酸、水等物质发生反应产生氧气)为了验证该反应中氧气的产生,某兴趣小组的同学设计了如下图所示的实验.

(1)实验室确定气体发生装置时应考虑的因素是______;制取CO2的装置,应从下列图1、图2、图3中选择______.

(2)检查图2装置的气密性的方法是:将装置中导气管上的胶皮管用弹簧夹夹住,往长颈漏斗中注入水至液面高出漏斗颈的下端管口,若能观察到______现象,即可证明装置不漏气.

(3)设计A、B装置的目的是净化导入的纯净且干燥的CO2.其中,①A装置的具体功能是______所发生的化学方程式是______;②B装置的具体功能是______,其瓶内液体应是______;

(4)为了确定CO2跟Na2O2反应产生的气体是氧气,最后还要采用的验证实验操作是______.

(5)表明二氧化碳没有被过氧化钠完全吸收的现象是______.

(6)常温下水也能与Na2O2反应,生成氧气和氢氧化钠,写出该反应的化学方程式.______.

(7)某潜水艇上有4人,如果每人每小时消耗的氧气在某温度和压强条件下体积为50L,则该潜水艇中每天需要过氧化钠多少千克?(已知:在上述温度和压强条件下氧气的密度为1.5g/L)______.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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There are lots of places for you to go into the Internet. For example, your school may have the Internet. You can use it during lessons or free time. Libraries often have computers joined to the Internet. You are welcome to use it at your spare time.

Thanks to the Internet, the world is becoming smaller and smaller. It is possible for you to work at home with a computer in front, getting and sending the information you need. It is also possible for you to discuss some projects or assign the work on the Internet instead of at a meeting. In addition, you can buy or sell whatever you want by the Internet. But do you know 98% of the information on the Internet is in English? So what will English be like tomorrow?

小题1:What is the passage mainly about?

A.Internet.

B.Information.

C.Computers.

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A.Doing with information on the Internet.

B.Using the Internet to communicate with friends.

C.Going shopping by the Internet.

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B.The officer.

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D.No one.小题4:Which may be the most possible place for people to work in the future?

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C.Most of the information is in English.

D.Every computer must have the Internet.

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