问题 实验题

2011年是国际化学年(IYC2011),其宗旨是“增进公众对化学重要性的认识,鼓励青年人热爱化学,学习和研究化学”.某校化学兴趣小组的同学,对课本中一氧化碳还原氧化铁实验作了绿色化改进后制取单质铁(K1,K2是活塞):

(1)关闭K1、开启K2,可以验证CO还原Fe2O3的产物.

①这是关于气体的实验,实验前必须对装置进行_________

②CO还原Fe2O3的化学方程式为_________

③在e处点燃气体的目的是_________

(2)关闭K2,开启K1,可以将d口出来的气体再从a通人装置而循环使用.

①c瓶中应装_________(填序号).

A.澄清石灰水     B.水C.石蕊溶液     D.浓硫酸

②反应完后(假设b瓶中NaOH全部转化为纯碱),要从b瓶中溶液得到纯碱固体,必要的实验操作为转移、_________.

③该实验这样改进的主要优点是_________.

答案

(1)①气密性检查;

②3CO+Fe2O32Fe+3CO2

③防止污染空气;

(2)①D;

②蒸发;

③减少碳的排放,提高原料利用率.

完形填空
It's five minutes before the exam and you are very nervous, You just have to    it, but how? You didn't even    the book the night before and you hear a sound in your head saying "Cheating(作弊),cheating…" so what are you going to do?
Most young people     that cheating is wrong. However, they have cheated at least once in their school years. So, why do they do it? Are they too      to study? Perhaps, it's not as simple as that. Many students cheat because they want to get good    .Some students think it's OK to cheat      the subject isn't important.
It has never been easier to cheat than it is today. With all the technology(技术),students don't need to chat by looking over their shoulders any more. They use cell phones to send      to each other during a test. There is also the     .With hundreds of websites, students don't have to worry because they can find lots of things that they can copy and use in their reports.
But we must know that cheating is wrong, and it doesn't really matter whether you get       or not. You mustn't cheat because cheating is a     . How can you be proud of something you've got through cheating? In the end, you lie to yourself!
小题1:
A.fillB.coverC.passD.take
小题2:
A.openB.useC.findD.close
小题3:
A.argueB.blameC.warnD.believe
小题4:
A.lonelyB.lazyC.slowD.late
小题5:
A.gradesB.skillsC.habitsD.excuses
小题6:
A.howB.whetherC.ifD.unless
小题7:
A.papersB.answersC.reportsD.exercises
小题8:
A.InternetB.TVC.radioD.dictionary
小题9:
A.lostB.caughtC.hurtD.used
小题10:
A.crimeB.caseC.behaviour D.lie
单项选择题 A1/A2型题