问题 填空题

有一块锌片插入足量CuSO4溶液1L中,可以观察到锌片表面有黄色附着物析出,最后称量时锌片质量减轻了0.1g(假设溶溶液体变化忽略不计),求:

(1)(1)参加反应的还原剂的物质的量是                  

(2)还原产物的物质的量是                  

(3)生成ZnSO4的物质的量浓度是                  

(4)溶液的质量                  ;(填“增加”或“减少”)

(5)写出该反应的离子方程式                  

答案

(1)0.1 mol (2) 0.1 mol(3)0.1 mol/L(4)增加 (5)Zn + Cu2+ = Zn2+ + Cu

题目分析:锌片插入足量CuSO4溶液发生反应为:Zn+CuSO4=ZnSO4+Cu。锌是还原剂,CuSO4是氧化剂,ZnSO4还原产物,Cu是还原产物。根据方程式可得每有1mol锌即65克参加反应就生成64克铜,对固体来说质量减少;对溶液来说质量增加。这时固体质量减少1克,现在质量减少0.1克,所以参加反应的还原剂锌的物质的量是0.1摩尔,C(ZnSO4)=0.1mol/1L=0.1 mol/L.该反应的离子方程式是:)Zn + Cu2+ = Zn2+ + Cu。

阅读理解

The booking notes of the play “ the Age of Innocence” .

Price: $ 10

BOOKING:

There are four ways to book seats for performance :

---In person

The Box Office is open from Monday to Saturday , 10 a.m. --- 8 p.m.

---By telephone _

Ring 01324976 to reserve your tickets or to pay by credit card (Visa , MasterCard and Amex accepted )

---By post

Simply complete the booking form and return it to Global Theatre Box Office .

---On line

Complete the on-line booking form at www.Satanfiedtheatre.com

DISCOUNTS:

Saver : $ 2 of any seat booked any time in advance for performances from Monday to Thursday . Savers are available for children who are below the age of 16 years old , over 60s and full-time students.

Supersaver: half-price seats are available for people with disabilities and one companion . It is advisable to book in advance . There is a maximum of eight wheelchair spaces available and one wheelchair space will be held until an hour before the show .

Standby: best available seats are on sale for $ 6 from one hour before the performance for people eligible (suitable ) for Saver and Supersaver discounts and thirty minutes before for all other customers .

Group Bookings : there is a ten percent discount for parties of twelve or more .

School : school parties of ten or more can book $ 6 standby tickets in advance and will get every tenth ticket free .

Please note : we are unable to exchange tickets or refund (退还) money unless a performance is cancelled due to unforeseen circumstances .

小题1:If you want to book a ticket , you CANNOT ___________.

A.use the Internet

B.go to the Box Office on Sundays

C.ring the booking number and pay for the tickets by credit card

D.complete a booking form and post it to the Box Office小题2:According to the notes , who can get $ 2 off ?

A.A 55-year-old woman

B.An 18-year-old teenager

C.A 20-year-old full-time college student

D.The people who book the tickets on Fridays小题3:If you make a group booking for a group of 16 adults , how much should you pay ?

A.$ 120

B.$ 126

C.$ 144

D.$ 150小题4:From the passage we can know all the following are true EXCEPT that ___________.

A.there are only 8 wheelchair spaces in the theatre

B.a group of 12 persons can get 10 percent discount

C.the audience can’t refund money if the performance is on show

D.a school party of 15 students should pay $ 90 for the standby tickets

单项选择题