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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. Consider the following standard half reactions.
2 H⁺¹_(aq) + 2 e^-1 H_2(g)            E^o = 0.00 V

Sn⁺²_(aq) + 2 e^-1 Sn_(s)             E^o = -0.15 V

Cd⁺²_(aq) + 2 e^-1 Cd_(s)             E^o = -0.40 V

Which pair of substances will react spontaneously?

a) Sn⁺² with Cd⁺²

b) Sn with Cd⁺²

c) Sn⁺² with H⁺¹

d) Cd with Sn

e) Cd with Sn⁺²

2. Calculate E^o for the cell reaction      2 Cr + 3 Sn⁺⁴ 3 Sn⁺² + 2 Cr⁺³
Cr⁺³ + 3 e^-1Cr             E^o = -0.74 V

Sn⁺⁴ + 2 e^-1Sn⁺²         E^o = 0.15 V

a) 1.93 V

b) 0.89 V

c) 0.59 V

d) 0.45 V

e) -0.59 V

3. Given the standard potentials for the following half reactions:
Cr⁺³ + 3 e^-1Cr              E^o = -0.74 V

Pb⁺² + 2 e^-1Pb             E^o = -0.13 V

Calculate the Gibbs free energy for the reaction
2 Cr + 3 Pb⁺²3 Pb + 2 Cr⁺³      when the initial concentration of Cr⁺³ and Pb⁺² are 1.00 M.

a) -504 kJ

b) -353 kJ

c) 353 kJ

d) 504 kJ

e) 1060 kJ

4. Calculate the equilibrium constant, K, at 25^oC for the reaction
Sn_(s) + Pb⁺²_(aq) Sn⁺²_(aq) + Pb_(s)

where E^o_cell equals 0.014 V.

a) 1.7

b) 3.0

c) 4.8

d) 8.8

e) 12

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1.	Consider the following standard half reactions. 2 H⁺¹_(aq) + 2 e^-1 H_2(g) E^o = 0.00 V Sn⁺²_(aq) + 2 e^-1 Sn_(s) E^o = -0.15 V Cd⁺²_(aq) + 2 e^-1 Cd_(s) E^o = -0.40 V Which pair of substances will react spontaneously?

	a)	Sn⁺² with Cd⁺²
	b)	Sn with Cd⁺²
	c)	Sn⁺² with H⁺¹
	d)	Cd with Sn
	e)	Cd with Sn⁺²



2.	Calculate E^o for the cell reaction 2 Cr + 3 Sn⁺⁴ 3 Sn⁺² + 2 Cr⁺³ Cr⁺³ + 3 e^-1Cr E^o = -0.74 V Sn⁺⁴ + 2 e^-1Sn⁺² E^o = 0.15 V

	a)	1.93 V
	b)	0.89 V
	c)	0.59 V
	d)	0.45 V
	e)	-0.59 V


3.	Given the standard potentials for the following half reactions: Cr⁺³ + 3 e^-1Cr E^o = -0.74 V Pb⁺² + 2 e^-1Pb E^o = -0.13 V Calculate the Gibbs free energy for the reaction 2 Cr + 3 Pb⁺²3 Pb + 2 Cr⁺³ when the initial concentration of Cr⁺³ and Pb⁺² are 1.00 M.

	a)	-504 kJ
	b)	-353 kJ
	c)	353 kJ
	d)	504 kJ
	e)	1060 kJ



4.	Calculate the equilibrium constant, K, at 25^oC for the reaction Sn_(s) + Pb⁺²_(aq) Sn⁺²_(aq) + Pb_(s) where E^o_cell equals 0.014 V.

	a)	1.7
	b)	3.0
	c)	4.8
	d)	8.8
	e)	12