问题 问答题

请用下图提供的装置和试剂组装一套用一氧化碳使氧化铜还原成铜的实验装置,并回答下列问题.

(1)实验时气体若按从左向右反应,则这套装置的连接顺序是(填接口处字母):______接______,______接______.

(2)实验开始时,是先加热CuO,还是先通入CO?______,理由是______.

(3)装置A的作用是:______、______.实验后应将气球里的尾气______,反应的化学方程式为______.

(4)贮存在装置C中的CO是先在贮气瓶中注满水,然后用排水法收集的,贮气时CO应从______处通入贮气瓶中(填接口处字母).

答案

(1)根据一氧化碳还原氧化铜时,先通入一氧化碳、加热反应、检验生成物、尾气吸收,连接装置的顺序为:e接b,c接a,

(2)由于一氧化碳气体是可燃性气体,所以在点燃前要先通入一氧化碳气体使装置中的空气排净,然后再加热,防止气体不纯,加热时发生爆炸;

(3)根据题目信息可知需要检验二氧化碳,检验二氧化碳常用澄清石灰水,反应现象是石灰水变浑浊;一氧化碳有毒性,所以要进行尾气处理,气球可以吸收一氧化碳,防止污染空气;反应后应将气体烧掉,反应的化学方程式为:

2CO+O2

 点燃 
.
 
2CO2

(4)用排水法收集一氧化碳时,从e端进入集气瓶,一氧化碳聚集在上部将水从d导管中压出.

故答案为:(1)e、b,c、a;

(2)先通入CO;排除玻璃管中的空气,防止CO与空气混合后加热发生爆炸;

(3)检验生成物中的CO2,收集CO防止污染空气;烧掉,2CO+O2

 点燃 
.
 
2CO2

(4)e.

阅读理解

I used to watch her from my kitchen window.She seemed so small as she struggled her way through the crowd of boys on the playground.The school was across the street from our home and I would often watch the kids as they played during break.I remember the first day I saw her playing basketball.I watched in wonder as she ran circles a- round the other kids.She managed to shoot jump shots just over their heads and into the net.The boys always tried to stop her but no one could.I began to notice her at other times, basketball in hand, playing alone.

One day I asked her why she practiced so much.Without a moment of hesitation she said, "I want to go to college.The only way I can go is to get a scholarship to save money for our family.I am going to play college basketball.I want to be the best.My Daddy told me if the dream is big enough, the facts don't count." Well, I had to give it to her ?she was determined.I watched her through those junior high years and into high school.Every week, she led her school team to victory.

One day in her senior year, I saw her sitting in the grass, head in her arms.I walked up and sat down in the cool grass beside her.Quietly I asked what was wrong. "Oh, nothing," came a soft reply, "I am just too short." The coach told her that she would probably never get to play for a top ranked team ?much less offered a scholarship —so she should stop dreaming about college.She was heartbroken and I felt my own throat tighten as I sensed her disappointment.I asked her if she had talked to Father about it yet.She told me that her father said those coaches were wrong.They just did not understand the power of a dream.He told her that if she truly wanted a scholar-ship, nothing could stop her except one thing —her own attitude.

The next year, as she and her team went to the Northern California Championship game, she was offered a scholarship and joined the college team.She was going to get the college education that she had dreamed of.

小题1:.

The author was probably the girl's___      _.

A.neighbor

B.friend

C.teacher

D.mother小题2:.

.Why was the girl's heart broken?

A.She was considered too short to be a top player.

B.Her coach stopped her training because of her height.

C.She couldn't be on a college basketball team.

D.She wouldn't be admitted by her basketball friends.小题3:.

We can learn from the passage that ___    _.

A.her family wouldn't like to pay her college fee

B.her father forced her to play basketball in collage

C.being a top basketball player can win a scholarship for college

D.she wouldn't like to turn to his father for help when in difficulty小题4:.

.Which proverb best matches the story?

A.Practice makes perfect.

B.Rome was not built in a day.

C.Where there is a will, there is a way.

D.Pride comes before a fall.

单项选择题