问题 选择题

NA表示阿伏加德罗常数的值,下列说法正确的是(   )

A.标准状况下,将分子总数为NA的NH3和HCl的气体混合,其体积为22. 4升

B.14克氮气中所含有的共享电子对数为1.5NA

C.1L 1mol/LFeCl3溶液中,含有Fe3+的个数为NA

D.合成氨反应中,当断裂3NA个H-H共价键的同时生成6NA个N-H共价键,则该反应达到平衡状态

答案

答案:B

A 错误,NH3和HCl混合,会发生反应,得到氯化铵固体

B 正确,14克氮气为0.5mol,所含有的共享电子对数为1.5NA

C 错误,由于Fe3+的水解,含有Fe3+的个数小于NA

D 错误,旧键的断裂和新键的生成都是指的同一反应方向,不能说明反应达到平衡状态

完形填空

第二节完形填空(共15小题;每小题1分,满分15分)

阅读下面短文,掌握其大意,然后从36-50各题所给的四个选项(A、B、C和D)中,选出最佳选项。

A boy came to a wise man living in a beautiful palace to learn about the secret of happiness. The wise man  36   with everyone in his palace, and the boy had to wait long before his  37 . But the wise man told him he had no time to explain the secret of happiness then. He handed the boy a teaspoon that held  38  drops of oil and said, “Please  39  the palace and return in two hours, but carry this spoon  40  allowing the oil to spill(洒出).”

The boy wandered around, keeping his eyes  41  on the spoon. After two hours, he returned.

“Well,” said the wise man, “Did you see the wonderful works of art hanging in my dining hall? Did you see the garden which it  42  the gardener ten years to create?” The boy’s face turned red. He said his only  43  was not to spill the oil.

“Then go back and  44  my palace”, said the wise man, “You cannot trust a man if you don’t know his house.”

Relieved, the boy  45  up the spoon and returned to his exploration of the palace; this time observing all of the works of art and all the  46  in the garden. Upon returning to the wise man, he described in  47  everything he had seen.

“But where are the drops of oil I gave to you?” asked the wise man. Looking  48  at the spoon he held, the boy saw the oil was  49 .

“Well, this is the only  50  I can give you”, said the wise man. “The secret of happiness is to see all the wonders of the world and never to forget the drops of oil on the spoon.”

36. A. argued     B. talked     C. fought     D. played

37. A. duty       B. place      C. turn       D. distance

38. A. some       B. any       C. other        D. little

39. A. get out      B. look around         C. drop out         D. build up

40. A. with       B. for         C. without          D. instead

41. A. covered    B. stared        C. absorbed       D. fixed

42. A. took      B. spent          C. used        D. made

43. A. business      B. interest         C. concern       D. regret

44. A. find       B. reach      C. observe    D. protect

45. A. put        B. stood        C. brought          D. picked

46. A. stones    B. signs       C. mystery        D. beauty

47. A. trouble      B. detail     C. order     D. return

48. A. down     B. up     C. over    D. out

49. A. gone    B. removed    C. cold    D. frozen

50. A. gift     B. news    C. advice     D. reward

不定项选择