问题 问答题

按要求写出下列反应的方程式,并注明反应的类型

(1)用电解海水的方法来制取新能源氢气,是一种理想的提取能源的方法.______;______反应.

(2)工业上的湿法冶金原理,就是用铁与硫酸铜溶液反应来置换铜.______;______反应.

(3)新制备的灰黑色铁粉暴露在空气中却能迅速燃烧生成红色的三氧化二铁粉末.______;______反应.

(4)碱式碳酸铜[Cu2(OH)2CO3]受热后生成三种氧化物,其中一种是黑色粉末氧化铜,另一种是能使澄清石灰水变浑浊的气体.______;______反应.

答案

(1)水通电分解生成氢气和氧气,反应的化学方程式为:2H2O

 通电 
.
 
2H2↑+O2↑;该反应符合“一变多”的特征,属于分解反应.

(2)铁与硫酸铜溶液反应生成硫酸亚铁和铜,反应的化学方程式为:Fe+CuSO4=Cu+FeSO4;该反应是一种单质和一种化合物反应生成另一种单质和另一种化合物的反应,属于置换反应.

(3)新制备的灰黑色铁粉暴露在空气中却能迅速燃烧生成红色的三氧化二铁粉末,反应的化学方程式为:4Fe+3O2=2Fe2O3;该反应符合“多变一”的特征,属于化合反应.

(4)碱式碳酸铜[Cu2(OH)2CO3]受热后生成三种氧化物,其中一种是黑色粉末氧化铜,另一种是能使澄清石灰水变浑浊的气体(二氧化碳);由质量守恒定律,第三种氧化物是水,反应的化学方程式为:Cu2(OH)2CO3

  △  
.
 
2CuO+CO2↑+H2O;该反应符合“一变多”的特征,属于分解反应.

故答案为:(1)2H2O

 通电 
.
 
2H2↑+O2↑;分解;(2)Fe+CuSO4=Cu+FeSO4;置换;(3)4Fe+3O2=2Fe2O3;化合;(4)Cu2(OH)2CO3
  △  
.
 
2CuO+CO2↑+H2O;分解.

阅读理解

Three rich ladies met every day by the river. They sat there and talked the whole day. Once the three ladies quarreled(争吵). One of them said. “Look, how white and beautiful my hands are!” Another one said, “My hands are more beautiful. “ The third one said, “Mine are the most beautiful ones. “ An old beggar woman came up to them. “Beautiful ladies,” she said, “I’m old and can’t work, I’m hungry. Please give me something to eat.”

But the three ladies gave her nothing. They only asked, “Tell me, old woman, who of us has the most beautiful hands?” “I shall tell you a little later,” the old woman said and walked away.

A peasant (农民) woman was also sitting by the river. She was poor and her hands were dark because of hard work. The old woman came up to her and said, “I’m hungry. Please give me something to eat. “ The peasant woman took out her a piece of bread and gave a half of it to the old woman.

The old woman ate it and drank some water. Then she took the peasant woman by the hand, brought her before the rich ladies and said, “Now, I shall tell you whose hands are the most beautiful. The hands of the poor peasant woman are dark because of work, but they give me food; they are far more beautiful ,because your hands do nothing. ”

小题1:         went to the bank every day.

A.An old woman

B.Three rich ladies

C.A peasant woman

D.All of them小题2:What did the ladies quarrel about?

A.Who could be rich

B.Who could be the queen

C.Whose hands were the most beautiful

D.Where they should go小题3:The old woman wanted to        .

A.go home

B.have breakfast

C.get something to eat

D.hit them小题4:Who else was on the river bank?

A.A rich lady

B.A peasant woman

C.An old woman

D.A child小题5:         hands were the most beautiful according to passage.

A.The rich ladies’

B.The old woman’s

C.The peasant woman’s

D.All of the above

问答题