问题 多选题

锂电池已经成为新一代实用化的蓄电池,该电池具有能量密度大、电压高的特性.锂离子电池放电时的电极反应式为

负极反应:C6Li-xe-=C6Li1-x+xLi+(C6Li表示锂原子嵌入石墨形成的复合材料)

正极反应:Li1-xMO2+xLi++x e-=LiMO2(LiMO2表示含锂的过渡金属氧化物)

下列有关说法正确的是(  )

A.锂电池充电时电池反应为C6Li+Li1-xMO2=LiMO2+C6Li1-x

B.在电池反应中,锂、锌、银、铅各失去1mol电子,金属锂所消耗的质量最小

C.锂电池放电时电池内部Li+向负极移动

D.锂电池充电时阴极反应为C6Li1-x+xLi++xe-=C6Li

答案

A.由所给电池正负极反应式加合得电池的总反应式为C6Li+Li(1-x)MO2=LiMO2+C6Li(1-x),充电反应为放电反应的总反应的逆反应,则锂电池充电时电池反应为LiMO2+C6Li1-x=C6Li+Li(1-x)MO2,故A错误;

B.在电池反应中,锂、锌、银、铅各失去1mol电子,消耗的质量分别为:

7
1
g、
65
2
g、
108
1
g、
207
2
g,对比可知金属锂所消耗的质量最小,故B正确;

C.在原电池放电时,电池内部的阳离子向正极移动,阴离子向电源的负极移动,故C错误;

D.锂电池充电时阴极发生还原反应,生成锂的单质,与原电池的负极反应相反,反应的电极反应式为C6Li1-x+xLi++xe-=C6Li,故D正确.

故选BD.

阅读理解

阅读理解。

     Amelia Earhart's (1897-1937) childhood was not the typical girl's. She liked nothing better than to explore

the banks of the Missouri River, where she climbed trees and hunted rats with her rifle (步枪). She also built

her own roller coaster (过山车).

     The exciting life of the American aviation (航空) pioneer is dramatized in the movie Amelia, which is due

to come out on October 23.

     After Earhart paid a pilot $1 to take her up for a short fly in his plane, aviation became her love and career. 

     As she later explained, "Never do things others can do and will do, if there are things others cannot do or

will not do."

     Earhart found herself a flying teacher and started to 1earn to fly. She took all sorts of jobs to pay for the

lessons and to buy a second-hand plane on her 24th birthday.

     In 1932, Earhart flew solo (单人的) across the Atlantic. She became the first woman to make the solo

crossing. She also made a flying suit for women and went on to design other clothes for women who led

active lives. "Now and then women should do for themselves what men have already done-occasionally what

rnen have not done-thereby establishing themselves as persons, and perhaps encouraging other women toward

greater independence of thought and action," she said.

     When she was nearly 40, Earhart was ready for a final challenge-to be the first woman to fly around the

world. However, in mid-night, she and her navigator (导航员) disappeared in bad weather. 

     Earhart will be forever remembered as a brave pioneer for both aviation and for women.

1. According to the passage, which of the f0110wlng statements is true? [ ]

A. A movie about Earhart's exciting life has come out.

B. Earhart never did things others could and would do.

C. Earhart's love for aviation carne after she new a plane for a short time.

D. In Earhart's opinion, women should think and act more independently.

2. The underlined word in paragraph 2 means _____. [ ]

A. presented

B. adopted

C. published

D. created

3. From the passage we can know that _____. [ ]

A. Earhart showed rnost interest in adventure trips to the Missouri River during her childhood

B. Earhart's ambition was to fly across the Atlantic

C. Earhart challenged herself constantly

D. Besides flying, Earhart also designed planes and clothes

4. You can probably find this article in _____. [ ]

A. a booklet

B. a newspaper

C. a guide book

D. an advertisement

单项选择题