问题 阅读理解

阅读理解。

     Mr White works in a factory in the town. There are not many people in the factory. They make clothes

there. The workers go to work early in the morning. On Saturday and Sunday they' don't go to work. They

stay at home.

     Mrs White cooks for the workers in the factory. She likes cooking. In the middle of the day the workers

have lunch in the factory. They are very friendly. They like the food Mrs White cooks.

1. What is Mr White?

A. He is a worker.

B. He is a cook.

C. He is the manager of the office.

D. He is a teacher.

2. What is Mrs White?

A. She is a worker.

B. She is a cook.

C. She is a cleaner.

D. She is a housewife.

3. Are Mr White and his wife in the same factory?

A. Yes, they are.

B. No, they are not.

C. Yes, they do.

D. No, they don't.

4. What do the workers do in the factory? They make _______.

A. food

B. clothes

C. pens

D. cookers

5. When do the workers have a rest?

A. On Saturday.

B. On Sunday.

C. On Saturday and Sunday.

D. We don't know.

答案

1-5      ABABC

实验题

氢氧化铜固体受热分解能得到两种氧化物,一种为固体,另一种是无色液体。某化学活动小组为确定这种固体产物是什么,进行了如下探究活动。

《假设》:生成的固体产物 ①可能是氧化亚铜(Cu2O)(红色) ;

②可能是           

《设计实验》:小明用氢氧化钠溶液与硫酸铜溶液

反应制得氢氧化铜,放入试管中,使其在加热条件下分解(如下图),观察到蓝色粉末逐渐变成黑色。

请指出仪器名称:a           b           

《推测结论》:猜想______成立。

《形成结论》:写出氢氧化铜受热分解的化学方程式:_______________________________。

《查阅资料》知:(1)此黑色固体可用氢气还原,则小明选择下列________装置进行实验;

(2)已知Cu2O有如下性质:Cu2O+H2SO4==Cu+CuSO4+H2O ,在用氢气还原黑色固体后得到的铜中常混有少量Cu2O,取此Cu和Cu2O的

混合物共10g放入足量的稀硫酸中充分反应, 过滤得9.5g固体,则此混合物中Cu2O的质量分数为________。

《拓展与思考》:小华也用氢氧化钠溶液与硫酸铜溶液反应,但得到的沉淀不呈蓝色,而是浅绿色的;他又将此浊液加热直至沸腾,观察不到有分解变黑的迹象。为什么?小华查找资料得知,该浅绿色沉淀物是溶解度极小的碱式硫酸铜,其化学式为Cu4(OH)6SO4,同时还生成硫酸钠;此浅绿色沉淀能与酸反应,形成蓝色溶液。则碱式硫酸铜中铜元素的化合

价为______,请帮小华写出生成浅绿色沉淀的有关反应的化学方程式:_________________。

小华想设计一个实验,证明该浅绿色沉淀中含有硫酸根, 于是将沉淀过滤、洗涤,把沉淀再溶解在足量的无色溶液A中,取所得溶液滴加无色溶液B,若有大量白色沉淀生成,则表示原浅绿色沉淀中有SO42-,试推测:(1)无色溶液A的化学式是       ,无色溶液B的化学式是    

(2)写出产生白色溶液的化学方程式                   

单项选择题