问题 填空题

理论上讲,任何自发的氧化还原反应都可以设计成原电池.请利用反应“2Fe3++Cu=2Fe2++Cu2+”设计一个化学电池(正极材料用碳棒),回答下列问题:

(1)该电池的负极材料是______,发生______反应(填“氧化”或“还原”),电解质溶液是______;

(2)正极的电极反应式______;

(3)外电路中,电子是从______极流出.

答案

(1)原电池中失电子的物质作负极,根据方程式知,铜作负极,比锌活泼性小的金属或导电的非金属作正极;铜失电子,发生氧化反应;电解质是反应物中可溶性的、得电子的物质,所以电解质是可溶性的铁盐,可用氯化铁作电解质;

故答案为:铜;氧化;氯化铁;

(2)正极上得电子,发生还原反应,根据方程式知,Fe3+得电子,生成Fe2+

故答案为:2Fe3++2e-=2Fe2+

(3)负极上失电子,正极上得电子,所以电子的流向是;从负极沿导线经正极流出.

故答案为:负极沿导线经正.

单项选择题 A1型题
阅读理解

Twelve years ago, when I was 50,I wondered what 60 or 70 would be like? I looked around and saw only one style of living. It’s not fair, I thought. Young people have so many styles to choose from, but older people have just one choice. So I decide to do something about it , something practical.

I worked on my fitness by joining exercise classes in town. A few years later, my husband and I moved to a retirement community, and I wanted to teach aerobic(有氧运动的)classes. The community center wouldn’t give me a room to teach in, so I had to walk around and find any available empty room.

One day, the community center staff came to me and asked if I would help with the entertainment for a Hawaiian luau(夏威夷式宴会)they were putting on. I said yes. Then I talked five other ladies into dancing with me. We performed the hula(呼啦舞)and a war chant and brought the house down. Someone had a camera and took pictures, and then sent them to our local paper. We got requests for more engagements, which in turn led to more publicity and yet more engagements. Soon we had invitations from all over the country. The Dancing Grannies were born!

I think the real secret of the Dancing Grannies is out attitude. I was raised extremely poor ---no-food poor. If we wanted toys we had to make things up to play with ,so I learned early to be very creative. And you know,I think being poor was one of the best things that ever happened to me because I learned to look for treasures.

That’s what I’m still doing today—looking for the treasure in growing old. I’m getting better and better.

It’s true that antiques have to be treated a bit differently, with a little care, but they still have a beauty of their own. 

小题1:What did the writer think of the living style of the older people when she was 50?

A.Unsatisfying

B.Favorable

C.Pleasant

D.Practical小题2:Why did the writer have to walk around and find an empty room?

A.Because she couldn’t offer an expensive room.

B.Because she wasn’t given a room to teach in by the community center.

C.Because she wanted to find a better one.

D.Because she wanted to keep fit by walking.小题3:What can we infer from the writer’s performance?  

A.It was just so-so.

B.It was a failure.

C.It was average.

D.It was a success.小题4:What made the writer learn to look for treasures?

A.Being active

B.Being creative

C.Being rich

D.Being poor小题5:What does the underlined word “antiques” (in the last paragraph) refer to?  

A.Ancient treasures

B.Poor children

C.Old people

D.The Dancing Grannies