问题 填空题

(10分)胆矶(CuSO4•5H20)广泛用于电镀工艺,在医药上用做收敛剂、防腐剂和催吐剂。以下是用铜粉氧化法生产胆矾的流程图:

(1 )写出溶解过程中发生反应的离子方程式:____________

(2)1:1的H2SO4溶液是由l体积98%的H2SO4与1体积水混合而成。配制该硫酸所需的硅酸盐质仪器除玻璃棒外.还需要______、______。

(3)已知氧化亚铜(Cu2O)与稀H2SO4反应有CuSO4和Cu生成。假设焙烧后固体只含铜的氧化物.为检验该固体的成分.下列实验设计合理的是__________________(填字母)。

A.加人稀H2SO4,若溶液呈蓝色,说明固体中一定有CuO

B.加人稀H2SO4,若有红色沉淀物生成,说明固体中一定有Cu2O

C.加人稀HNO3,若有无色气体(随即变成红棕色:)产生,说明固体中有Cu2O

D.加人稀HNO3,若固体全部溶解,说明固体中没有Cu2O(4)取2.50g胆矶样品,逐渐升温加热分解,分解过程的热重曲线(样品质量随温度变化的曲线)如图所示。

①a点时固体物质的化学式为______,c点时固体物质的化学式为______。

②10000C时发生反应的化学方程式为_________________________

答案

阅读理解

阅读理解。

      Mr King goes to a dinner party. He is wearing old clothes. He comes into the room. But people

in the room don't look at him. They don't ask him to sit at the table. Mr King goes home and puts on

(穿上) his good clothes. He goes back to the party. Everyone in the room stands up and smiles (微笑)

at him. They give him very good food to cat. Mr King takes off (脱下) his clothes, and puts them in the

food and says, "Eat, clothes!" The other people ask, "What are you doing?" He answers, "I'm asking my

coat to eat food. I am wearing my old clothes. You don't look at me. You don't ask me to sit down.

Now I'm in these clothes. And you give me very good food.  Now I see. you. give the food to my

clothes, not to me ! "

1. Mr King goes to a _____.        

A. birthday party              

B. dinner party

C. evening party              

D. welcome party

2. Mr King goes home to _____ his _____clothes.          

A. put on, good              

B. puts on, fine

C. take off, good            

D. wear, good

3. Mr King goes back to the party with _____.          

A. his old clothes                  

B. a very good car

C. his good clothes                

D. a good watch

4. Mr King takes off his good clothes, and _____ them _____the good food.          

A. ask, to eat                      

B. asks, to eat

C. lets, to eat                      

D. ask, eat

5. Mr King says the good food is _____.         

A. for him                        

B. for his good clothes

C. for me                        

D. for his money

单项选择题