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

发布时间：2017-06-02 06:32 │ 来源：www.tikuol.com

题型：选择题

问题：

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。

考点：芳香烃的通式卤代烃苯的同系物苯

题型：选择题

阅读理解。

Tom and mother are sitting at the table. They are having lunch. "I don't like this cake. I don't want to
have it." says Tom. "All right." says his mother,"please don't have it." After lunch, Tom's mother work on
the farm. They work hard. In the evening Tom's mother gives him a cake. "Oh, this cake is good." says
Tom.

1. Where is Tom sitting?

A. On the farm.
B. Under the tree.
C. In the room.
D. At the table

2. What is Tom doing?

A. He's having lunch.
B. He's reading.
C. He's talking to his parents.
D. He's doing his homework

3. Does Tom like the cake at noon?

A. Yes, he does.
B. No, he doesn't.
C. He likes it very much.
D. He doesn't know.

4. In the evening Tom's mother gives him .

A. another cake
B. another fork
C. the same cake
D. the same fork

5. _____Tom and his mother work on the farm.

A. In the moring
B. In the afternoon
C. In the evening
B. On Sunday

查看答案

题型：选择题

下列关于秦朝的有关说法，不正确的是（）

A．秦始皇让百姓申报土地，承认土地私有，按亩纳税

B．秦朝的丞相执掌群臣奏章，下达皇帝诏令

C．秦朝的货币有金币和铜币，“半两钱”是下币

D．秦朝严禁私人办学

查看答案

题型：选择题

已知两个质点相距r时，它们之间的万有引力大小为F；若将它们之间的距离变为2r，则它们之间的万有引力大小为（　　）

A．4F

B．2F

C．

D．

查看答案

题型：选择题

针刺可以治疗脾不运化水湿病证的穴位是（）

A.隐白

B.阴陵泉

C.阳陵泉

D.公孙

E.足三里

查看答案

题型：选择题

下列哪些不是躯体形式障碍的特征：（）

A.病人反复陈述躯体的症状

B.不断要求做相关的医学检查

C.能相信医生对无躯体疾病的保证

D.主动谈及其心理病因

E.发病与其个性有关

查看答案

更多题库