问题 实验题

我们知道蜡烛燃烧生成二氧化碳和水。下图是测定蜡烛燃烧时质量变化装置,天平是物理天平,左托盘上蜡烛的上方罩着吸收器。如果实验时,蜡烛正常燃烧,生成的气体顺利通过吸收器,吸收器的药品只在3分钟内起吸收作用,试回答:

(1)本实验中,蜡烛燃烧时,反应物是________,生成物是________,反应条件是_____________。

(2)3分钟内,天平是否平衡?___,原因是___________________。

(3)3分钟后,会出现什么结果?__________________,原因是_______________,蜡烛燃烧是否符合质量守恒定律_________________________。

答案

(1)蜡烛和氧气二氧化碳和水点燃  

(2)不平衡  生成物中增加了氧元素.并且被吸收器吸收,导致左盘内物质质量增加  

(3)天平右盘向下倾斜3分钟后,吸收器的药物不能再吸收生成物,二氧化碳和水蒸气会逸散  符合

完形填空
My friend Mr. Smith is a famous doctor and has a hospital. So he has enough money to __11__ all over the world. And he’s been to a lot places of interest. He likes to __12__ children and has a lot of little __13__. They often ask him to tell them all kinds of funny things he __14__. It makes them happy and his room is always full __15__ children when he’s free.
It was my little son’s seventh birthday yesterday. The boy wanted to __16__ his old friend Mr. Smith to the party. He __17__ Mr. Smith himself and told him about it. the doctor accepted his __18__ happily. At half past seven the boy was waiting for his coming at the gate. __19__he saw his car, he ran towards him. Mr. Smith __20__ on time, with a nice present in his hand. After dinner the children sat around the traveler and asked him to __21__ them some funny stories. Mr. Smith agreed and his stories made them __22__ again and again. At last th told them the funniest story. He said, “ Once I reached a city __23__a foggy day. The fog was the thickest in the world …”
Please wait a__24__, Mr. Smith,” said my son, “ It’s said the fog in London is the thickest in the world.”
“You’re __25__, my clever boy.” Said the funny doctor. “ The city had much fog that day …”“ What’s it, the?” the boy couldn’t wait to ask again.
“ The fog was so thick that I couldn’t see it at all,” the funny doctor said with a smile.
小题1:
A.workB.fightC.liveD.travel
小题2:
A.wait forB.look overC.play withD.look after
小题3:
A.friendsB.brothersC.workersD.classmates
小题4:
A.readB.wroteC.thoughtD.saw.
小题5:
A.withB.forC.ofD.by
小题6:
A.sendB.askC.carryD.get
小题7:
A.knewB.caughtC.taughtD. called
小题8:
A.invitationB.thingsC.carD.money
小题9:
A.BeforeB.As soon asC.UntilD.Since
小题10:
A.cameB.answeredC.saidD.played
小题11:
A.speakB.sayC.tellD.talk
小题12:
A.thinkB.laughC.cryD.fear
小题13:
A.withB.inC.atD. on
小题14:
A.momentB.dayC.weekD.year
小题15:
A.sorryB.sadC.wrongD.right
问答题 简答题