问题 实验题

某学生设计氨催化氧化实验,并将制得的NO进一步氧化为NO2,用水吸收NO2,并检验HNO3的生成。可供选择的固体药品有:NH4Cl、Ca(OH)2、KClO3、MnO2、CaO。可供选择的液体药品有:H2O2、浓盐酸、水。可供选择的仪器有:

另有铁架台、铁夹、铁圈、乳胶管若干,可供选择。设计实验时,A和B两个制气装置均允许使用两次,其余装置只能使用一次。

(1)氨氧化制NO的化学反应应在装置                 中进行。

(2)制取NH3的装置最好选择                    ,其化学反应方程式为                                        ;为快速制取O2的装置最好选择         ,其化学反应方程式为                            

(3)各仪器按气流方向连接的正确顺序为:

A、B→G→    → F →       → H。(按装置先后排列顺序补充完整)

(4)装置C的作用是                                          

( 5 ) 如果实验前需收集一试管的氨气,如何采用一种简易方法检验试管中

氨气是否集满(简述操作、现象和结论)?

                                                                               

                                                                           

(6)装置H中溶液显红色,其原因是                                  

                                                                  

(7)请据以上实验事实设计一个实验来检验一份白色药品是铵盐,写出其正确

的实验操作步骤                                                      

                                                                    

答案

(1)F  (1分)

(2)B;

A;     (6分)

(3) A、B→G→D→F→C→E→H (2分)

(4) 除去过量的NH3和生成的H2O (2分)

(5)把湿润的红色石蕊贴在玻璃棒靠近试管口处,如果试纸变蓝色.说明氨气已收集满了。(共3分操作、现象、结论各1分)

(6)原因是二氧化氮溶于水中生成了硝酸,硝酸使紫色石蕊试液变成红色(2分)

(7)取少量的该白色样品与碱混合后放入试管中共热,并把湿润的红色石蕊贴在玻璃棒靠近试管口处,如果试纸变蓝色,说明该白色样品就是氨盐。(共3分操作、现象、结论各1分)

完形填空
As Christmas is coming, there are presents to be bought, cards to be sent, and rooms to be cleaned. Parents are ___36___ with difficult jobs of hiding presents from curious young children. If the gifts are large, this is sometimes a real ___37___. On Christmas Eve, young children find the excitement almost unbearable.  They are torn between the  wish to go to bed early so that  Father Christmas will bring their presents quickly and the wish to ___38___ up late so that they will not ___39____ the fun. The wish for gifts usually proves stronger. But though children go to bed early, they often lie ___40___ for a long time, hoping to get a short ___41___ at Father Christmas.
Last Christmas, my wife and I ___42___ hid a few large presents in the storeroom. I ___43___ the moment when my son, Jimmy, would ___44___ me where that new bike had come from, but ___45___ he did not see it.
On Christmas Eve, ___46___ took the children hours to go to sleep. It must have been nearly___47___ when my wife and I went quietly into their room and began ___48___ stockings. Then I pushed in the ___49____ I bought for Jimmy and left it beside the Christmas tree. We knew we would not get much sleep that night, for the children were ___50___ to get up early. At about five o’clock the next morning, we were ___51___ by loud sounds coming from the children’s room — they were shouting excitedly! ___52_____ I had time to get out of bed, young Jimmy came riding into the room on his new bike, and his sister, Mary, followed close behind pushing her new baby carriage. ____53_____ the baby arrived. He moved ___54____ the hands and knees into the room dragging a large balloon behind him. Suddenly it burst. That woke us up ___55___. The day had really begun with a band(巨响) !
小题1:
A.facedB.metC.filledD.pleased
小题2:
A.questionB.matterC.ProblemD.business
小题3:
A.getB.stayC.standD.wake
小题4:
A.loseB.breakC.missD.leave
小题5:
A.awakeB.wakeC.asleepD.sleep
小题6:
A.lookB.stareC.glareD.watch
小题7:
A.hopefullyB.busilyC.gladlyD.successfully
小题8:
A.likedB.fearedC.surprisedD.hated
小题9:
A.answerB.tellC.askD.search
小题10:
A.sadlyB.unluckilyC.possiblyD.fortunately
小题11:
A.itB.theyC.ID.we
小题12:
A.morningB.midnightC.eveningD.daybreak
小题13:
A.fillingB.sewingC.mendingD.preparing
小题14:
A.presentB.stockingC.bikeD.tree
小题15:
A.goingB.sureC.gladD.excited
小题16:
A.troubledB.frightenedC.wokenD.shocked
小题17:
A.BeforeB.AfterC.UntilD.Since
小题18:
A.EvenB.AndC.SoonD.Then
小题19:
A.withB.onC.overD.by
小题20:
A.allB.nearlyC.happilyD.completely
问答题 案例分析题