(1)向黄色的FeCl3溶液加入无色的KSCN溶液,溶液变成血红色:FeCl3+

题型:填空题

问题:

(1)向黄色的FeCl3溶液加入无色的KSCN溶液,溶液变成血红色:FeCl3+3KSCN=Fe(SCN)3+3KCl。向上述血红色溶液中加入NaF溶液振荡,只观察到血红色溶液迅速褪成无色,发生该现象的可能原因是__________________________

(2)无水CoCl2为深蓝色,吸水后变为粉红色的水化物(CoCl2·XH2O),水化物受热后又变成无水CoCl2,故常在实验室中用作吸湿剂和空气湿度指示剂。现有65g无水CoCl2吸水后变成119gCoCl2·XH2O。经测定该化合物中Co2+配位数为6,1mol CoCl2·XH2O溶于水后,滴加硝酸银溶液,析出1mol AgCl沉淀。则

CoCl2·XH2O的化学式用配合物的形式可表示为_____________。

考点:配合物理论
题型:填空题
Long ago, there was a mother and a son living in a house. She worked hard everyday,     they were always poor.
  One day, her son stole his friend's     . "Mom, what do you think of this bag?" His mother praised(表扬)her son      scolding(责骂)him. "It looks great!"
  The next time, he stole an overcoat. She praised him again       he stole it.
  A few years later, he       to be a young man. He stole jewelry and      them to his mother. "How     !" This time, she did not scold her son again.
  Then, because he was     scolded by his mother, he started to steal more expensive things. One day, the police      him. Before putting him in       , he begged the police to meet his mother. They took him to his mother.
  As soon as he saw his mother, he        her earlobe(耳垂). "Ouch! What's the matter with you?" She finally scolded him. Her son answered, "     you had given me a scolding like that when I stole the first bag, I could not have become a thief."
The mother’s       was broken as she looked at her son heading to prison. "If I only could _   time, I would scold him strictly." She regretted(后悔) that she always praised him,      he did.
小题1:
A.butB.andC.orD.then
小题2:
A.bagB.watchC.bikeD.book
小题3:
A.because ofB.instead ofC.becauseD.instead
小题4:
A.beforeB.sinceC.whenD.until
小题5:
A.put upB.looked upC.got upD.grew up
小题6:
A.broughtB.putC.toldD.bought
小题7:
A.beautifulB.terribleC.usefulD.kind
小题8:
A.oftenB.neverC.sometimesD.always
小题9:
A.heardB.lookedC.caughtD.searched
小题10:
A.hospitalB.schoolC.hotelD.prison
小题11:
A.bitB.hitC.tookD.ate
小题12:
A.IfB.UnlessC.ThoughD.Although
小题13:
A.eyeB.heartC.mouthD.ear
小题14:
A.turn onB.turn offC.turn backD.turn down
小题15:
A.whereverB.whoeverC.wheneverD.whatever
题型:填空题

矫形器的应用,不正确的是

A.固定损伤的关节

B.矫正畸形

C.防止肢体水肿

D.辅助肢体活动

E.限制肢体异常活动

题型:填空题

孟子的什么学说能使人可以不畏缩进取又能自我解脱,减少患抑郁症的可能()。

A、人性恶

B、结果论

C、人性善

D、动机论

题型:填空题

2013年6月海协会和台湾海基会两会领导人第九次会谈取得新成果,双方签署了哪一项重要协议?

题型:填空题

均有凉血、养阴作用的药物是()

A.赤芍、红花

B.生地、玄参

C.犀角、牛黄

D.丹皮、紫草

E.玄参、丹皮

更多题库