问题 填空题

(1)下列物质在固态时,属于分子晶体的有___________,属于原子晶体的__________ ,属于离子晶体的有______________ 。

①金刚石 ②氩 ③水晶 ④水银 ⑤氧化铝 ⑥P4 ⑦苯

(2)比较下列物质的有关性质(用“>、<、=或≈”号连接)

沸点:16O2 ————18O2 熔点:Na_________ K 稳定性:H2O ________D2O

(3)某常见固体能导电,质软,它可能属于__________

A.分子晶体 B.原子晶体 C.离子晶体 D.金属晶体 E.混合晶体

(4)在氯化铯晶体(见图1)中,若以某一铯离子为球心,与之等距离的若干离子构成一个球面。与某铯离子距离最近的离子构成的球面(最内层的球面或第一层球面) 上有_________个__________离子(填写离子符号,下同),第二层球面上有___________个___________离子。

(5)在氯化钠晶体(见图2)中,每个钠离子与___________个最近且等距离的氯离子以__________键相结合,与每个氯离子最近的且等距离的氯离子有____________个。由于晶体中离子按一定的规律排列,必然造就了一颗完美晶体特定的几何外形,其中,氯化钠单晶的宏观外形为______________。

  

答案

(1)②⑥⑦ ;①③;⑤

(2)< ; >  ;≈或=

(3)DE

(4)8;Cl-; 6;Cs+

(5)6; 离子 ;12  ;立方体

选择题
单项选择题

Randy Kraus was paralyzed. His left side was useless. But his right hand was (1) enough to lift a bucket to his forehead. Once, he’d been a police officer and owned a private-eye agency. Once, he’d been p and able. Now, he felt he was nothing.

His (2) started with Parkinson’s disease, but it didn’t (3) there. In July 2002, the 60 year old Kraus went into the hospital for an operation to control the shaking. (4) , during the operation, he had a stroke. He was paralyzed. The (5) man, who loved golf, could think, but couldn’t (6) . Kraus wanted the doctors to (7) it to him straight. "You may never walk again, " they told him. "Maybe you won’t (8) be able to talk. "

Once at home, he (9) he couldn’t lift a fork or take a drink by himself. Physical treatment was so painful and slow. What did he have to (10) for So now Kraus held the gun against his head. (11) the cold metal on his skin, he began to consider not his pain, but the pain he (12) cause his wife, daughters and grandchildren. He didn’t pull the trigger.

"You are where you are", his exercise physiologist, Andrew Garud told him. "The pace would be slow; the pain would be (13) . But as long as you are (14) , you have the ability to get better. " After three months of (15) with Garud, Kraus wanted to see if he could (16) . He could. Then he took three steps, sat down and cried like a baby. One step (17) to another. Next he managed a short walk. It was the hardest (18) of Kraus’s life.

Garud kept saying he could (19) more. Now, Kraus can brush his teeth, shave himself and get around the house with a walker. Little success only the paralyzed can (20) understand.

17().

A.turned

B.pointed

C.led

D.stuck