大连理工07秋学期开放英语1在线作业3

求助一道大连理工的无机化学题
已知298K时E( MnO4- / Mn2+ ) = 1.51 V,E ( Fe3+ / Fe2+ ) = 0.771 V.用KMnO4溶液滴定FeSO4溶液,两者在酸性溶液中发生氧化还原反应.
(1) 写出相关反应的离子方程式,计算298K时该反应的标准平衡常数K ；
(2) 若开始时 c ( Fe2+ ) = 5.000 × 10-2 mol·L-1,c ( MnO4- ) = 1.000 × 10-2 mol·L-1,V ( Fe2+ ) = 20.00 mL,则反应达到平衡时,需要多少毫升KMnO4 溶液；
(3) 平衡时,若c ( H+ ) = 0.2000 mol·L-1,则 c ( Mn2+ )、c ( Fe3+ )、c ( MnO4- )、c ( Fe2+ )各为多少?
(4) 平衡时E( MnO4- / Mn2+ )、E ( Fe3+ / Fe2+ )各为多少?
(1) MnO4- + 5Fe2+ + 8H+ =Mn2+ + 5Fe2+ + 4H2O
K= 2.6 *1062
(2) c ( MnO4- ) V ( MnO4- ) = 1/5c ( Fe2+ ) V ( Fe2+ )
V ( MnO4- ) = 20mL
(3)设 平 衡 时 V(总)= 40.00 mL,c ’( MnO4- ) = x.
则 c ‘( Fe2+ ) = x,c ’( Mn2+ ) = 5.000 ×10-3 ,c ‘( Fe3+ ) = 2.500 ×10-2
为什么c ‘( Mn2+ ) = 5.000 ×10-3和设定V(总)= 40.00 mL?

大连理工1309专升本英语题
一、单选题（共 20 道试题,共 80 分.）
1.When Lily came home at 5 p.m.yesterday,her mother __________ dinner in the kitchen.
A.cooked
B.was cooking
C.cooks
D.has cooked
2.In 1958 Marian Anderson ________ her country as a United Nations delegate.
A.served
B.was served
C.to serve
D.serving
3.We all know that there are ________ ways of getting to know a person.
A.varying
B.variety
C.various
D.various of
4.It __________ every day so far this month.
A.is raining
B.rained
C.rains
D.has rained
5.Public interest centers on the __________ of next week's election,so it seems no one cares about the opening of this 20-storey shopping mall.
A.consequence
B.influence
C.outcome
D.effect
6.Success is not won ________.It takes patience,diligence and continuing efforts.
A.twilight
B.attentively
C.currently
D.overnight
7.It's important for you to make a list of your tasks in order of _______ when you work on a project.
A.suggestion
B.goal
C.priority
D.tip
8.The young ________ interested in pop music.
A.is
B.have
C.has
D.are
9.I invited Joe and Linda to dinner,but _________ of them came.
A.neither
B.either
C.none
D.both
10.Before falling asleep,Helen ________ the day's happenings.However,she couldn't recall who put forward that plan in the first place.
A.repeated
B.reviewed
C.reported
D.retained
11.Did you notice the guy __________ head looked like a big potato?
A.who
B.which
C.whose
D.whom
12.Coal was formed out of dead forests by a long and slow _______ of chemical change.
A.press
B.procedure
C.success
D.process
13.From a practical point of ________,it isn't a good place to live.It is crowded and heavily polluted.
A.view
B.look
C.opinion
D.value
14.There have been many ______ in their marriage,but they still love each other.
A.right and wrong
B.back and forth
C.ups and downs
D.right and left
15.The students were all entertained in a Mexican restaurant,at Professor Brian's __________.
A.money
B.pay
C.expense
D.loss
16.He didn’t act like a gentleman as he made several __________ comments about his opponent with whom he would compete for the same post.
A.discouraging
B.lucky
C.unfavorable
D.favorable
17.Smoking is __________ here.Could you move to the smoking zone please?
A.forbidden
B.stopped
C.preserved
D.ceased
18.Their efforts to improve the production have been very _________,and they have been praised by the company for their contribution.
A.effective
B.efficient
C.effect
D.affective
19.What is the train ________ to Birmingham?
A.fee
B.tip
C.fare
D.cost
20.How much did you _____ all these things?
A.spend
B.cost
C.give
D.pay for

大连理工无机化学第四版课后题答案
18页思考题第4,7,10；
39页思考题5习题15；
69页习题10,18,19,20,21,22,23

关于一道原子结构的~
按照COTTON原子结构图13号应该是E4s>E3d,但是大连理工写的三本书上全是给的E4sE3D,那么为什么又是充到4S去啊?你的说法矛盾哦~