
原电池&电极电势
Quiz
•
Chemistry
•
11th Grade
•
Practice Problem
•
Medium
Tan Yean
Used 2+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
某电池可用以下电池符号来表达:
Zn(s)/Zn2+(aq)∥Cu2+(aq)/Cu(s)
下列哪项关于此电池的叙述是错误的?
氧化作用在负极进行
锌电极是还原剂
铜将沉淀在铜电极上
电子会从锌电极释放到溶液里
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
某电池中两个半反应的标准电极电位如下所示:
铂电极A:MnO−4+8H++5e−→Mn2++4H2O E∘=+1.51V
铂电极B:Cl2+2e−→2Cl− E∘=+1.36V
下列叙述中,哪些是正确的?
Ⅰ 此电池的标准电动势是 +0.15 V
Ⅱ 外电路中电子从铂电极B流向铂电极 A
Ⅲ 电池符号是 Pt(s)∣Mn2+(aq),MnO−4(aq)∥Cl−(aq),Cl2(g)∣Pt(s)
Ⅰ
Ⅰ,Ⅱ
Ⅱ,Ⅲ
Ⅰ,Ⅱ,Ⅲ
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
如果
Mg2+(aq)+2e−→Mg(s) E∘=−2.38V
Cu2+(aq)+2e−→Cu(s) E∘=+0.34V
则原电池 Mg(s)∣Mg2+(aq)∥Cu2+(aq)∣Cu(s)的标准电动势(Eº)是多少 V?
+2.72
-2.72
+2.04
+1.36
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
X、Y、Z- 按还原性强度递增的顺序,正确的排列是________。
X < Y < Z-
X < Z- < Y
Z- < X < Y
Z- < Y < X
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
在标准电池反应中,电子的流动方向是怎样的?
从负极流向正极
从正极流向负极
在电解质中随机流动
不流动
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
据下列反应,Cu、Cd、Zn的还原性强弱顺序为何?
Zn + CuBr2 →Cu + ZnBr2
Cd + ZnBr2 →没有反应
Cu + CdBr2 →没有反应
Zn > Cu > Cd
Zn > Cd > Cu
Cu > Cd > Zn
Cd > Zn > Cu
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
图表所示为各物质的标准电极电势。据图,下列哪个是最强氧化剂?
K+
Al
Pb4+
Pb2+
8.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
图标所示是各物质的标准电极电位。据图,下列哪些物质可与Fe发生反应?
Pb4+而已
Pb2+和Au
I2和Pb2+
Pb4+和Au3+
9.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
图标所示是各物质的标准电极电势。据图,求由Pb2+/Pb和Mg2+/Mg组成的原电池所产生的电动势大小为多少?
+2.49V
+4.17V
+2.25V
+0.57V
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