问题 选择题

用惰性电极电解Fe2(SO43和CuSO4的混合溶液,且已知Fe2(SO43+Cu=2FeSO4+CuSO4,下列说法正确的是(  )

A.阴极反应式为:Cu2++2e-═Cu,当有Cu2+存在时,Fe3+不放电

B.阴极上首先析出铁,然后析出铜

C.阴极先是Fe3+放电,后Cu2+放电

D.阴极上不可能析出铜

答案

A.由反应Fe2(SO43+Cu=2FeSO4+CuSO4可知,氧化性:Fe3+>Cu2+,则Fe3+得电子能力比Cu2+强,所以,在阴极首先得电子的是Fe3+,当Fe3+存在时,Cu2+不放电,故A错误;

B.当Fe3+完全反应后Cu2+放电,首先析出铜,故B错误;

C.因氧化性:Fe3+>Cu2+,阴极先是Fe3+放电,后Cu2+放电,故C正确;

D.由B分析可知,当Fe3+完全反应后Cu2+放电,可析出铜,故D错误.

故选C.

完形填空

第二节信息匹配(共5小题;每小题2分,满分10分)

下面是一篇应用文及其应用场合的信息,请阅读下列应用文和相关信息,并按照要求匹配信息。

首先,请阅读下列A----F运动学校、中心或俱乐部的信息:其中有一项是多余选项。

A.Riding School: You can start horse-riding at any age. Choose private or group lessons any weekday between 9 am and 8:30 pm (3:30 pm on Saturdays). There are 10 kilometres of tracks and paths for leisurely rides across farmland and open country. You will need a riding hat.

B.Sailing Club: Our Young Sailor's Course leads to the Stage 1 Sailing qualification. You’ll learn how to sail safely and the course also covers sailing theory and first aid. Have fun with other course members afterwards in the clubroom. There are 10 weekly two-hour lessons (Tuesdays 6 pm ~ 8 pm).

C.Diving Centre: Our experienced instructors offer one-month courses in deep-sea diving for beginners. There are two evening lessons a week, in which you learn to breathe underwater and use the equipment safely. You only need a swimming costume and towel. Reduced rates for couples.

D.Tennis Club: Learn to play tennis in the heart of the city and have fun at our tennis weekends. Arrive on Friday evening, leam the basic rules on Saturday and play in a competition on Sunday. There's also a disco and swimming pool. White tennis clothes and a racket are required.E. Watersports Club: We use a two-kilometre length of river for speedboat racing, and water-skiing. A beginners' course consists of ten 20-minute lessons. You will learn to handle boats safely and confidently, but must be able to swim. The club is in a convenient central position and is open daily from 9 am to 4 pm, with lessons all through the day.

F. Golf Club: After a three-hour introduction with a professional golfer, you can join this golf club. The course is built on beautiful country hills and is open from dawn until dusk daily. There are regular social evenings on Saturdays in the club bar. You will need your own golf equipment.

请阅读下列运动爱好者的信息,然后匹配61---65运动爱好者与拟加入的运动学校、中心或俱乐部:

61. Jack Anderson. Jack works in the city centre and wants to take up a sport that he can do regularly in his lunch hour. He enjoys activities which are fast and a bit dangerous.

62. Margaret Lillian. Margaret already plays golf at weekends. Now she has retired and wants to leam a new activity she can do in the countryside in the mornings.

63. Peter Florian. In six weeks' time, Peter is having a holiday on a Thailand island, where he plans to explore the ocean depths. He has a 9-to-5 job and wants to prepare for this holiday after work.

64. Alice Fingelhamm. Alice is 16. She wants to do an activity one evening a week and get a certificate at the end. She would also like to make new friends.

65. Lynne Nagata. Lynne has a well-paid but stressful job. She would like to take up a sport which she can do outside the city each weekend. She also wants to get to know some new people.

问答题