Electrochemistry

Course Home Page

Electrochemistry

Quiz Number: 7 Course Name: Chemistry Course No.132 Quiz N0. : 7 Teacher: Billy K. Cook Teacher's Home Page: http://faculty.icc.cc.il.us/bcook Teacher's Email: Bcook@icc.cc.il.us

No. of Questions= 4

Half-way there

1. In the electrolysis os a basic solution, oxygen can be produced by the half reaction
4 OH^-1O₂ + 2 H₂O + 4 e^-1

How many moles of O₂ can be produced from a solution that was electrolyzed for 3.00 hours using a current of 8.00 amps?

a) 1.49 x 10^-2

b) 4.48 x 10^-2

c) 0.224

d) 0.448

e) 0.896

2. What is the value of the reaction quotient, Q, for the cell that is constructed from the two half-reactions
Zn⁺² + 2 e^-1Zn             -0.76 V

Ag⁺¹ + 1 e^-1Ag              0.80 V

when the Zn⁺² concentation is 0.0100 M and the Ag⁺¹ concentration is 1.25 M?

a) 156

b) 125

c) 1.25 x 10^-2

d) 8.00 x 10^-3

e) 6.40 x 10^-3

3. What is the emf at 25^oC for the following cell?
Cr | Cr⁺³ (0.010 M) || Ag⁺¹ (0.00010 M) | Ag

Cr⁺³ + 3 e^-1Cr                 E^o = -0.74 V

Ag⁺¹ + 1 e^-1Ag                E^o = 0.80 V

a) 2.09 V

b) 1.34 V

c) 0.95 V

d) 1.74 V

e) 1.50 V

4. When a solution of cesium iodide is electrolyzed, the products that would be expected are:
Cs⁺¹_(aq) + 1 e^-1 Cs_(s)                                 E^o = -2.92 V

I_2(s) + 2 e^-1 2 I^-1_(aq)                                   E^o = +0.54 V

2 H₂O_(l) O_2(g) + 4 H⁺¹_(aq) + 4 e^-1             E^o = -1.23 V

2 H₂O_(l) + 2 e^-1 H_2(g) + 2 OH^-1_(aq)           E^o = -0.83 V

a) Cs_(s), I_2(s).

b) H_2(g), OH^-1_(aq), Cs_(s).

c) H_2(g), OH^-1_(aq), I_2(s).

d) O_2(g), H⁺¹_(aq), I_2(s).

e) H_2(g), OH^-1_(aq), O_2(g), H⁺¹_(aq).

Go to top of quiz
© Bcook
Illinois Central College
Created with QuizPlease


1.	In the electrolysis os a basic solution, oxygen can be produced by the half reaction 4 OH^-1O₂ + 2 H₂O + 4 e^-1 How many moles of O₂ can be produced from a solution that was electrolyzed for 3.00 hours using a current of 8.00 amps?

	a)	1.49 x 10^-2
	b)	4.48 x 10^-2
	c)	0.224
	d)	0.448
	e)	0.896



2.	What is the value of the reaction quotient, Q, for the cell that is constructed from the two half-reactions Zn⁺² + 2 e^-1Zn -0.76 V Ag⁺¹ + 1 e^-1Ag 0.80 V when the Zn⁺² concentation is 0.0100 M and the Ag⁺¹ concentration is 1.25 M?

	a)	156
	b)	125
	c)	1.25 x 10^-2
	d)	8.00 x 10^-3
	e)	6.40 x 10^-3



3.	What is the emf at 25^oC for the following cell? Cr \| Cr⁺³ (0.010 M) \|\| Ag⁺¹ (0.00010 M) \| Ag Cr⁺³ + 3 e^-1Cr E^o = -0.74 V Ag⁺¹ + 1 e^-1Ag E^o = 0.80 V

	a)	2.09 V
	b)	1.34 V
	c)	0.95 V
	d)	1.74 V
	e)	1.50 V


4.	When a solution of cesium iodide is electrolyzed, the products that would be expected are: Cs⁺¹_(aq) + 1 e^-1 Cs_(s) E^o = -2.92 V I_2(s) + 2 e^-1 2 I^-1_(aq) E^o = +0.54 V 2 H₂O_(l) O_2(g) + 4 H⁺¹_(aq) + 4 e^-1 E^o = -1.23 V 2 H₂O_(l) + 2 e^-1 H_2(g) + 2 OH^-1_(aq) E^o = -0.83 V

	a)	Cs_(s), I_2(s).
	b)	H_2(g), OH^-1_(aq), Cs_(s).
	c)	H_2(g), OH^-1_(aq), I_2(s).
	d)	O_2(g), H⁺¹_(aq), I_2(s).
	e)	H_2(g), OH^-1_(aq), O_2(g), H⁺¹_(aq).