问题 实验题

(共10分)有机物A可由葡萄糖发酵得到,也可从酸牛奶中提取。纯净的A为无色粘稠液体,易溶于水。为研究A的组成与结构,进行了如下实验:

实 验 步 骤解 释 或 实 验 结 论
(1)称取A 9.0g,升温使其汽化,测其密度是相同条件下H2的45倍。试通过计算填空:

(1)A的相对分子质量为:         

(2)将此9.0gA在足量纯O2充分燃烧,并使其产物依次缓缓通过浓硫酸、碱石灰,发现两者分别增重5.4g和13.2g。 

(2)A的分子式为:               

(3)另取A 9.0g,跟足量的NaHCO3粉末反应,生成2.24LCO2(标准状况),若与足量金属钠反应则生成2.24LH2(标准状况)。(3)用结构简式表示A中含有的官能团:

                              

(4)A的核磁共振氢谱如下图:

 

(4)A中含有            种氢原子;

(5)综上所述,A的结构简式                
 

答案

阅读理解

While you are in trouble, what are you going to do? What? Cry? Or escape? Those are all the wrong way! Robinson Crusoe can tell you the right answer!

It is an exciting story: Robinson Crusoe hated the comfortable life in his home town. So, he want to be a seaman and travelled around the world. But one day, a terrible thing happened. A great storm came and their boat crashed! No one was alive in this accident except Robinson. He was the luckiest man in the world--Because all his friends were dead but he was alive. However, at the same time he was the most tragic man of all—He must face the fact .Alone on an island without food, water or gun!But, all roads lead to Rome!He just used his hands to work hard!Then, he made a cave, built a house, grew corn and kept goats. In the end, he could enjoy the life on the island. In his twenty-fourth year on the island, he saved a wild man, and gave him the name of “Friday”. With Robinson’s teaching, “Friday” became a good servant. Friday, they got a boat and escaped from the island.

Surely, the writer of Robinson Crusoe is really a hero! It’s too hard to describe Robinson with words. We could say that Robinson was very clever, and also he was brave,...Certainly, too many good words can describe him. But now, I think it isn’t important. However, the most important thing is what we have learned from the story. That is, use our own hands to work hard with confidence!

小题1:Robinson wanted to be a sailor because        .

A.sailor was an interesting job

B.he could earn more money to be a sailor

C.he wanted to have an adventure experience

D.he didn’t like the quiet life in his home town小题2:How many people were alive in the accident?

A.No one.

B.One

C.Two

D.Many小题3:The underlined word “tragic” means “       ” in Chinese.

A.悲惨的

B.伤心的

C.现实的

D.幸运小题4:Robinson met “Friday”          .

A. before he traveled around the world

B.when the accident happened

C.after he escaped from the island

D.when he was on the island小题5:According to the author,        is the most important thing we can learn from Robinson Crusoe.

A.being brave and hard-working

B.being brave and confident

C.being hard-working and confident

D.being brave, hard-working and confident

多项选择题