问题 填空题

在一块石棉板上,用大烧杯罩住三只小烧杯,如图(俯视)所示.在①号烧杯中盛滴有酚酞的蒸馏水,②号烧杯中盛石灰水,③号烧杯中盛少量白色的无水硫酸铜粉末.在石棉板A处放置碳铵粉末,然后用酒精灯对准A处小心地加热(碳铵受热分解产生氨气、水和二氧化碳),根据变化,回答问题:

①号杯中的现象______;②号杯中的现象______,化学方程式______;③号杯中的现象______,化学方程式______.

答案

碳铵受热分解产生氨气、水和二氧化碳,氨气溶于水所得氨水呈碱性,酚酞溶液与碱变红,二氧化碳溶于水生成碳酸,但生成的二氧化碳气体主要被石灰水吸收了,且二氧化碳的溶解性比氨气弱的多,对①号烧杯几乎没有影响,故①号烧杯中溶液变红色;二氧化碳气体能和澄清石灰水反应生成碳酸钙沉淀而变浑浊;白色的无水硫酸铜粉末与水会生成蓝色的五水硫酸铜晶体.

故答案为:①溶液变红;②澄清石灰水变浑浊,CO2+Ca(OH)2═CaCO3↓+H2O;③白色粉末变蓝,CuSO4+5H2O═CuSO4?5H2O.

阅读理解

A dog has a horse. The horse was beautiful and also it had many good qualities.   61    It especially wanted to become the most beautiful horse in the world.

One day the horse said to the god, “You have given me beauty. You have given me other good qualities.62    But how I wish you could make me more beautiful! I would be extremely, extremely grateful if you could make me more beautiful.”

The god said, “I’m more than ready to make you more beautiful.  63  ” Then the horse said, “My neck is too short .If you can make neck a little longer, my upper body will be more beautiful. And if you can make my legs much longer and thinner, then I will look more beautiful in my lower body.”

Then immediately the god made a camel appear in place of the horse. The horse was so sad that it started to cry, “Oh, no, I do not want to become a camel.   64 As a horse, everybody appreciated my good qualities. Nobody will appreciate me as a c I’m more than ready to amel.”

The god said, “This is exactly  what you asked for. You have become a camel.

65   if you cry for a longer neck and legs, this is what will happen. Each thing in my creation has its own good qualities. The camel is not as beautiful as you are, but it carries heavy loads and has a great sense of duty.”

A.I’m so grateful to you.

B.Why not remain a horse?

C.I wish you to change me into a horse again.

D.Tell me in what way you want to be changed.E.     But it wanted to be more perfect in every way.

F.      Never try to receive more than I have given you

G.    I am glad to know that you feel good with yourself now

单项选择题