问题 选择题

某化学兴趣小组的同学用如图所示装置研究电化学问题。当闭合该装置的电键时,观察到电流计的指针发生偏转。下列有关说法错误的是

A.甲装置是原电池,乙装置是电解池

B.当甲中产生0.1 mol气体时,乙中析出固体的质量为6.4 g

C.实验一段时间后,甲烧杯中溶液的pH增大

D.将乙中的C电极换成铜电极,则乙装置可变成电镀装置

答案

答案:D

题目分析:A、锌与稀硫酸反应生成硫酸锌与氢气,属于自发的氧化还原反应,即甲装置是原电池,其中锌是负极,铜是正极。乙装置是电解池,其中碳棒是阴极,Pt电极是阳极,A正确;B、甲中产生的气体是氢气,0.1mol氢气转移0.2mol电子,则依据电子守恒可知乙装置中析出铜的物质的量是0.1mol,质量是6.4g,B正确;C、甲装置中氢离子放电,溶液的酸性降低,因此实验一段时间后,甲烧杯中溶液的pH增大,C正确;D、乙装置中碳棒是阴极,因此将乙中的C电极换成铜电极,乙装置不能变成电镀装置,因为电镀装置中镀层金属应该作阳极,D不正确,答案选D。

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It is said that there are about 40,000 different kinds of jobs in the world. 小题1:“Finding a job ”is not the same as “choosing a job”. Many young people end up in a job which they are not suitable for . 小题2: Here are a few steps to help you think about jobs which you might enjoy doing after school or university.

First , it is important to realize what kind of person you are, which special qualities make you different from everyone else and what you are interested in . 小题3:If you like art and enjoy looking at pictures, this is an interest. But if you can draw a horse that looks like a horse instead of a big dog, that is a skill.

Then ask yourself this question: in the following three areas----skills with people, skills with  information and skills with things-----which are your best skills?

After examining your skills, the next step is research. To find out as many different kinds of jobs as possible, go to the library and read books, magazines and newspapers. 小题4:

Finally, trust your own ideas and your own thinking! 小题5:

A.It is your own life, so find something that you enjoy doing.

B.Choosing the right one itself is a difficult job.

C.We must know what our ideal jobs are.

D.There is a difference between an interest and a skillE. Ask your friends about the work they they do.

F. “Chance” may play a more important part than “decision”.

G. Your parents may also give you some useful advice.

单项选择题