问题 问答题

实验室用锌和稀盐酸反应制取氢气,并用实验来验证氢气还原氧化铜的产物(如下图装置).请回答下列问题:

(1)图中a、b所示仪器的名称:a______;b______.

(2)装置图中有一处错误的是:______.

(3)B装置的作用是:______.

(4)C装置中盛放的药品是______,设计装置C的目的是______.

(5)写出装置D和E实验现象:______.

(6)根据实验设计和实验现象,写出本实验的结论:______.

答案

(1)图中①长颈漏斗②铁架台,故答案为:长颈漏斗、铁架台;

(2)为使产生的气体不至于从长颈漏斗下方逸出,长颈漏斗的下端要深入液面以下.故答案为:错在装置A中长颈漏斗下端没有浸没在液体中;

(3)A装置中制取氢气是用的盐酸,盐酸容易挥发,为防止挥发的盐酸混入制取的氢气中,加入了装置B,故答案为:吸收HCl气体,净化氢气;

(4)A反应中还可能有水蒸气生成,所以要用浓硫酸来吸收.故答案为:浓硫酸、干燥氢气;

(5)D中的黑色氧化铜粉末被通入的氢气还原,变成红色的铜;此反应中还生成水,水进入E装置中的U形管,使无水硫酸铜由白色变为蓝色.故答案为:装置D中固体由黑变红,装置E中固体由白变蓝;

(6)根据(5)小题可知,此反应中氢气还原氧化铜的产物为水和铜.故答案为:氢气还原氧化铜的产物为水和铜.

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The Taj Mahal

Shah Jahan finished building Taj Mahal in 1648. He was a rich and powerful emperor, and he built the Taj Mahal as a memorial for his wife.  小题1:  The word “taj” means crown, “Mahal” was the name of his wife. Twenty thousand people worked for 18 years to complete this beautiful domed(圆顶屋) building. A thousand elephants carried huge stones and jewels from all over India and central Asia to the Taj. Shah Jahan wanted this memorial to be a burial place for himself and his wife.

The Taj Mahal is on the Yamuna River in Agra in northern India.  小题2:   Its picture is in most travel books and brochures. It is open daily from sunrise to sunset. For about fifteen rupees (or about US$0.33), anyone can enter this peaceful and quiet place.

As you enter, you pass through beautiful, silent gardens. From the gardens, you cross a wide courtyard. Suddenly, you see the dome of the main building through a tall, red sandstone gate. At daybreak, the Taj Mahal’s white walls turn rose. At noon, they blaze(发光)white. At dusk, they become dark grey.  小题3:  

After you pass through the gate, you step onto a wide stone platform. You look over another garden with pools. Everything is arranged carefully in fours.  小题4:  The garden is divided into four parts. There are straight rows of colorful flowers and trees in each of the parts. At the four corners of the Taj Mahal, there are pointed tall towers. After the gardens, you go down stone steps towards the main building with the tomb and the graves of Shah Jahan and his wife.

After hundreds of years, the Taj Mahal remains a lovely and peaceful place.  小题5:  

A.It was a monument of love.

B.Four is a special number in the Moslem religion.

C.Many people want to visit the Taj Mahal some day.

D.This beautiful building is truly a jewel for all people.E. The Taj Mahal is most beautiful by the light of the full moon.

F. To many people around the world, the Taj Mahal is a symbol of India.

G. From the cool, dark gates, the Taj Mahal seems to float between earth and sky.

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