试题与答案

无水AlCl3可用作有机合成的催化剂、食品膨松剂等.工业制备无水AlCl3的流程

题型:问答题

题目:

无水AlCl3可用作有机合成的催化剂、食品膨松剂等.工业制备无水AlCl3的流程如下:

(1)已知:C(s)+

1
2
O2(g)═CO(g)△H=-110.5kJ/mol,2Fe(s)+
3
2
O2(g)═Fe2O3(s)△H=-822.1kJ/mol

请写出C还原Fe2O3生成CO的热化学方程式______.

(2)反应2CO+O2

2CO2的平衡常数为K1;反应4Fe+3O2

2Fe2O3的平衡常数K2,则反应3CO+Fe2O3

2Fe+3CO2的平衡常数K与K1、K2的关系式______.

(3)高温下,氧化铁能跟碳发生下列反应:

①Fe2O3+3C

 高温 
.
 
2Fe+3CO ②Fe2O3+3CO
 高温 
.
 
2Fe+3CO2若反应产生的气体是CO2和CO,则
n(C)
n(Fe2O3)
的取值范围是______.

(4)氯化炉中生成的气体,通常用碱性的亚硫酸钠溶液来吸收,请用离子方程式分析亚硫酸钠溶液呈碱性的原因______.

(5)氯化炉中发生:3Cl2(g)+3C(s)+Al2O3(s)

2AlCl3(g)+3CO(g)△H>0,欲提高金属铝的氯化效果,不可采取的措施是______(填序号):

①增加C的量 ②多通入Cl2③升高温度 ④移走部分AlCl3(g) ⑤使用合适的催化剂工业上还常采用向氯化炉中通入O2的方法,其目的是______.

(6)沉淀分析法一般规定:溶液中某离子物质的量浓度低于1.0×10-5mol/L时,可认为已沉淀完全.现向一定浓度的AlCl3和FeCl3的混合溶液中逐滴加入氨水,当Fe3+完全沉淀时,测定c(Al3+)=0.2mol/L.此时所得沉淀中______(填“是”或“否”)含有Al(OH)3.(已知:Ksp[Fe(OH)3]=4.0×10-38,Ksp[Al(OH)3]=1.1×10-33).

答案:

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The wife-carrying World Championship has been celebrated in a small town in central Finland since 1992. In 1992, the people of the town decided to restart some long-forgotten traditions.  71  He was said to only accept men as members of his gang who proved their worth in challenges. At that time, it was also a common practice to steal women from neighboring villages.

72   A large number of competitors, people, and journalists from Finland to Canada attend the Wife-carrying World Championship every year.

73    The Wife-carrying World Championship is held on a 253.3 meters long official track. The track has two dry obstacles and a water obstacle, about a meter deep. The wife to be carried may be your own, or your neighbor’s. The minimum weight of the wife to be carried is 49 kg. If she is less than 49kg. If she is less than 49kg, the wife will be given a heavy bag to carry. Each time a competitor drops his wife, that couple will be fined 15 seconds.  74 

Alongside with the Wife-carring World Championship, there is also a team competition. The distance is the same but three men in the team carry the wife in turns. At the exchange point the carrier has to drink official “wife-carrying drink.” Then he may continue the race.  75 

While the Wife-carrying World Championship is being held, there are bands playing music, a wife carrying dance and other forms of entertainment.”

A.There are a few basic rules.

B.People everywhere hold the event.

C.A special prize is awarded to the team.

D.Do you know how these traditions restarted? E.This event is becoming increasingly popular.

F.The winner is the couple who complete the course in the shortest time.

G.Back in the late 1800s, there was a robber called Rosvo-Ronkainen in that area.

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