Electrochemical Cells Reactions Exam Practice

OON -k e¯

[REDF

Half Reaction

OX/RED

[OX]o

Half Reaction

  

Ag (aq) + e- Ag(s)

+0.799 V

Fe2+(aq) + 2ew Fe(s)

 

word image 2694 0.45 v

AgCl(s) + e- Ag(s) + Cl-(aq)

-0.222 v

Fe3 (aq) + e Fe2+(aq)

 

+0.771 V

Agl(s) + e- Ag(s) + 1-(aq)

-0.152 v

2 H (aq) +2e eH2(g)

 

o.ooov

Au3+(aq) + 3e- Au(s)

+1.52 v

H202(aq) + 2H+(aq) + 2e-

2H20(l)

+1.76V

word image 2695 I V

Br2(l) + 2e- 2 Br-(aq) +1.09 V Hg22+(aq) + 2e- 2 Hg(l) +0.7960 V

C12(g) + 2e- 2 Cl-(aq) +1.40 V Hg2C12(s) + 2e- 2 Hg(l) +2 Cl (aq) +0.26816 v

Cu2+(aq) + e- Cu+(aq) +0.158 v word image 2696 +2e e 2 1-(aq) +0.54 V

Cu2+(aq) + 2e cu(s) +0.340 V Ni2+(aq) + 2e- Ni(s) word image 2697 0.257 v F2(g) + 2e- -a 2 F-(aq) +2.87 v word image 2698 + Ni(s) + 2 OH (aq) word image 2699 0.72 v

1. Consider the following electrochemical cell: Ag(s) / Agl(s), I (aq) // I (aq), 12(s) / Pt(s)

word image 2700

(4

pt)

(3 pt) (b) What is the overall reaction occurring in the cell when current flows?

word image 2701

  1. pt) A

word image 2702

(c)

What

Br2(l) F2(g)

oxidizing need values to explain

word image 2703

3. Consider the following reaction: A + 4B 3C+2D

  1. pt) (a) If at a given moment of time the rate of change of B, A[Bl/At, is -4.8x 10-4 M/S, what is the rate of change of

A at the same time? Explain your answer either mathematically or in words.

word image 2704

word image 2705 what is the overall

word image 2706

B word image 2707

oox word image 2708

[RED]T

Ha If Reaction

 

[OXY

Ha If Reaction

  

Ag (aq) + e- Ag(s)

+0.799 V

Fe2+(aq) + 2e- Fe(s)

 

word image 2709 0.45 v

AgC1(s) + e- -e Ag(s) + Cl-(aq)

-0.222 v

Fe3+(aq) + e Fe2+(aq)

 

+0.771 V

Agl(s) + e- Ag(s) + I (aq)

word image 2710 0.152 v

2 H (aq) + 2e- H2(g)

 

o.ooov

Au3+(aq) + 3e- Au(s)

+1.52 v

H202(aq) + 2H+(aq) + 2e-

2H20(1)

+1.76V

word image 2711 OX/RED word image 2712 1 v

Br2(l) + 2e 2 Br (aq) +1.09 V Hg22+(aq) + 2e 2 Hg(l) +0.7960 V

C12(g) + 2e- 2 Cl-(aq) +1.40 V Hg2C12(s) +2e e 2 Hg(l) + 2 CV(aq) +0.26816 v

Cu2+(aq) + e- Cu+(aq) +0.158 V 12(s) + 2e- 2 1-(aq) word image 2713

Cu2+(aq) + 2e- Cu(s) +0.340 V Ni2+(aq) + 2e- Ni(s) word image 2714 0.257 v

F2(g) + 2e- 2 F-(aq) +2.87 v word image 2715 + Ni(s) + 2 OH (aq) word image 2716 0.72 v

word image 2717

(4

(3

(3 pt)

word image 2718

(c)

B

Au(s) Ni2+ (aq) Au3+(aq)

oxidizing need values to explain

word image 2719 word image 2720 vOC’*

SD

3. Consider the following reaction: A + 4B -+ 3C+2D

(4 pt) (a) If at a given moment of time the rate of change of C, A[C]/At, is 4 M/S, what is the rate of change of A at the same time? Explain your answer either mathematically or in words.

word image 2721

k[A][B], what is the overall

word image 2722

word image 2723

C

word image 2724 word image 2725 word image 2726 = OON

[REDV

OX/RED [oxy

Half Reaction

 

Half Reaction

  

Ag+(aq) + e- Ag(s)

+0.799 V

Fe2+(aq) + 2e Fe(s)

 

word image 2727 0.45 v

AgCl(s) + e- Ag(s) + Cl-(aq)

word image 2728 0.222 v

Fe3+(aq) + e Fe2+(aq)

 

+0.771 V

Agl(s) + e- Ag(s) + 1-(aq)

—0.152 V

2 H+(aq) + 2e- H2(g)

 

o.ooov

Au3+(aq) + 3e- Au(s)

+1.52 v

H202(aq) + 2H+(aq) +

-e 21420(1)

+1.76V

Br2(l) + 2e- 2 Br-(aq) +1.09 V Hg22+(aq) + 2e 2 Hg(l) +0.7960 V

C12(g) + 2e- 2 Cl-(aq) +1.40 V Hg2C12(s) + 2 Hg(l) + 2 Cl (aq) +0.26816 v

Cu2+(aq) + e Cu+(aq) +0.158 V 12(s) + 2e- 2 1-(aq) +0.54 word image 2729

Cu2 (aq) + 2e- Cu(s) +0.340 V Ni2+(aq) +2e word image 2730 0.257 v F2(g) + 2e- 2 F-(aq) +2.87 v word image 2731 +2e Ni(s) +2 OH (aq) word image 2732 0.72 v

word image 2733 1 . Consider the following electrochemical cell: Fe(s) / Fe2+ (aq) // H+ (aq), H2(g) / Pt(s)

word image 2734

(4

pt)

(3 pt) (b) What is the overall reaction occurring in the cell when current flows?

word image 2735

(3 pt) (c) What is AGO of the overall reaction occurring in the cell in kJ/m

word image 2736

818

word image 2737 -h ELI c

C

Au(s) N12+ (aq) Au3+(aq)

reducing need values to explain

word image 2738

3. Consider the following reaction: A + 4B word image 2739 3C+2D

word image 2740 (a) If at a given moment of time the rate of change of B, word image 2741 is 4 M/S, what is the rate of change of D at the same time? Explain your answer either mathematically or in words.

word image 2742

word image 2743 tea

word image 2744 H.«e v-e.k–e—

aec-

= what is the overall

word image 2745

D word image 2746

word image 2747

= oOX

word image 2748 [RED]T

AG = -nFEcell OX/RED word image 2749 n log [OX]O

Ha If Reaction Half Reaction

Ag+(aq) + Ag(s)

+0.799 V

Fe2+(aq) +2e Fe(s)

 

AgCl(s) + e Ag(s) + Cl-(aq)

-0.222 v

Fe3+(aq) + e- 82 Fe2+(aq)

+0.771 V

Agl(s) + e- Ag(s) + 1-(aq)

 

2 H (aq) + H2(g)

o.ooov

Au3+(aq) + 3e- Au(s)

 

H202(aq) + 2H+(aq) + 2e- 2H20(l)

+1.76V

Br2(1) + 2e- 2 Br-(aq)

 

Hg22+(aq) + 2e- word image 2750 word image 2751 word image 2752 word image 2753 word image 2754 word image 2755

word image 2756

C12(g) + 2e- 2 Cl-(aq)

+1.40 v

Hg2C12(s) + 2e- 2 Hg(l) + 2 Cl-(aq)

+0.26816 v

Cu2+(aq) + •e Cu+(aq)

+0.158 V

12(s) + 2e- 2 1-(aq)

 

Cu2+(aq) + 2e- Cu(s)

+0.340 V

N12+(aq) + 2e- -e Ni(s)

-0.257 v

F2(g) + 2e- 2 F-(aq)

 

Ni(OH)2(s) + 2e- Ni(s) + 2 OH-(aq)

word image 2757

1. Consider the following electrochemical cell: Ag(s) / AgCl(s), Cl- (aq) // Cl (aq), C12(g) / Pt(s)

word image 2758

  1. pt) D

word image 2759

(c)

Br2(l) F- (aq) Br- (aq) F2(g)

reducing need values to this.) explain your answer.

word image 2760

word image 2761 reek bru —9 ! soqvz

word image 2762 word image 2763 2 env

word image 2764

3. Consider the following reaction: A + 4B 3C+2D

  1. pt) (a) If at a given moment of time the rate of change of D, A[Dl/At, is 6.6x 10-4 M/S, what is the rate of change of B at the same time? Explain your answer either mathematically or in words.

word image 2765

(l pt) (b) If the rate law for this reaction has been determined by experiment to be rate = what is the overall kinetic order of the reaction?

 

Occ..k.aa

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