问题 填空题

铝是一种应用广泛的金属,工业上用Al2O3和冰晶石(Na3AlF6)混合熔融电解制得。铝土矿的主要成分是Al2O3,含有杂质SiO2、Fe2O3、MgO。工业上从铝土矿中提炼Al2O3并制取铝的流程如下:

请回答下列问题:

(1)铝与NaOH溶液反应的离子方程式为                                  

(2)图中涉及分离溶液与沉淀的玻璃仪器有烧杯、玻璃棒、_________。

(3)反应1涉及的化学方程式有                                               。滤液Ⅰ中加入CaO生成的沉淀是_     (填化学式)。

(4)向滤液Ⅱ中通入气体A为              ,生成沉淀B的离子方程式为                      

答案

(1)2Al+2H2O+2OH-=2AlO2-+3H2↑   (2)漏斗

(3)Al2O3+2NaOH=2NaAlO2+H2O   SiO2+2NaOH=Na2SiO3+H2O  CaSiO3

(4)CO2   AlO2+2H2O+CO2=Al(OH)3↓+HCO3

题目分析:(1)铝与NaOH溶液反应的离子方程式为2Al+2H2O+2OH-=2AlO2-+3H2↑;(2)图中涉及分离溶液与沉淀的玻璃仪器有烧杯、玻璃棒、漏斗;(3)二氧化硅与氢氧化钠反应生成硅酸钠与水,反应方程式为:2NaOH+SiO2═Na2SiO3+H2O,氧化铝与氢氧化钠反应生成偏铝酸钠与水,反应方程式为:2NaOH+Al2O3═2NaAlO2+H2O;滤液Ⅰ中含有硅酸钠、偏铝酸钠,加入CaO,生成氢氧化钙;(4)由工艺流程可知,B为氢氧化铝,故气体A为二氧化碳,滤液Ⅱ主要是偏铝酸钠,偏铝酸钠溶液通入二氧化碳,生成氢氧化铝与碳酸氢钠,故离子反应方程式为:AlO2+2H2O+CO2=Al(OH)3↓+HCO3

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Greg Woodburn, a student at the University of Southern California, spends a lot of time cleaning sneakers he collected. But soon the shoes will be sent to poor children in the United States and 20 other countries, thanks to Woodburn’s Share our soles (S.O.S) charity.

A high school track star in the town of Ventura, California, Woodburn was treated in hospital for months with foot injuries.

“I started thinking about the health benefits, the friendship and the confidence I got from running,” he says, “And I realized there are children who don’t even have shoes”.

Woodburn gathered up his old sneakers, and then asked his friends to donate. His goal was to have 100 pairs by Christmas 2006. When he collected more than 500 pairs, he decided to turn the shoe drive into a year-round effort.

Back then, the sneakers came from donation boxes and the local sporting goods store and from door-to-door pickups. Woodburn has now set up collection boxes at two high schools, city gym and recreation center. So far, S.O.S has collected and donated more than 3,000 pairs.

Woodburn has cleaned all the shoes. After sorting the shoes by size, Woodburn selects the good shoes for the washing machine and the worn-out ones for recycling.

For many recipients, the shoes represent opportunity. Two young boys in Southern California attended school every other day because they shared a pair of shoes. They were too big for one boy and too small for the other. Thanks to S.O.S, each brother received his own pair of shoes. The boys now attend school daily and enjoy their learning. When they graduate, they say, they will help a stranger, just as Woodburn helped them.

小题1:The text is mainly about    .

A.the attempts to collect sneakers

B.the school track star, Woodburn

C.Woodburn and his Share Our Soles

D.the recycling of the worn sneakers小题2:What caused Greg Woodburn to donate old shoes for poor children?

A.News about some poor children.

B.The benefits from playing sports.

C.His memory of school life.

D.The medical treatment he received.小题3:When collecting more sneakers than expected. Woodburn decided to      .

A.collect shoes throughout the year

B.set up branches in different cities

C.put out a call to his friends

D.make his effort in the whole city小题4:From the fifth paragraph we can learn that       .

A.Woodburn has changed his business

B.Few students are interested in his suggestion

C.Few people supported his career

D.Woodburn succeeded in this charity小题5:Which of the following is true according to the passage?

A.The two brothers would like to share a pair of shoes.

B.The shoes will protect poor children from injuries.

C.Woodburn gets tired of cleaning the old sneakers.

D.The shoes from S.O.S make a big difference to the two brothers.