CHM 2046C Name: ________________

Module 14 Paper and Pencil Homework Packet

Module Fourteen: Electrochemistry Chapter 17

Possible

Actual

Module 17 REDOX Review Chapter 4

A. M-8G Review: Rewrite Equations Ionically Section 4.3 (1 point each) (Balance)sample test

10

Answers

A1. M-8G Review: Rewrite Equations Ionically Section 4.3 (1 point each) Acid Media

20

Answers

A2. M-8G Review: Rewrite Equations Ionically Section 4.3 (1 point each) Basic Media

20

Answers

B. M-8H Review: Balancing REDOX Equations Sample test Item

10

Answers

B1. M-8H Review: Balancing REDOX Equations Sections 4.6, 4.7, 4.9, 4.10 (2 points each)

B1 Acid Media REDOX

20

ANSWERS

B2 Basic Media REDOX

20

Answers

Advanced Homework #1

10

Advanced Homework #2

10

Mother, Father, Son, Daughter, Mother-in-Law

Bonus

Module 17 REDOX Homework Total

120

 

Module 17: Part A Rewriting Equations Ionically (Balance) 10 points

Rewrite the following (unbalanced) equations ionically, cancel spectator ions and then balance the net ionic reactions.

 

Show as ions: soluble salts and strong acids; leave as molecules/formula units insoluble salts, weak acids, covalent molecules.

 

Strong acids are: Perchloric Acid; Hydrochloric Acid; Nitric Acid; Sulfuric Acid; Hydrobromic Acid; Hydroiodic Acid

 

1. KOH (aq) + HNO3(aq) KNO3(aq) + HOH(l)

 

 

 

 

2. CuSO4 (aq) + Na2CO3 (aq) CuCO3 (s) + Na2SO4 (aq)

 

 

 

 

 

3. NaOH (aq) + NH4NO3 (aq) NaNO3 (aq) + NH3 (g) + HOH (l)

 

 

 

 

 

4. BaBr2 (aq) + ZnSO4 (aq) BaSO4 (s) + ZnBr2 (aq)

 

 

 

 

 

5. Cr(OH)2 (s) + HCl (aq)

 

 

Part A1: Rewrite Equations Ionically (Section 4.3) Acid Media

 

Acid Media-20 Points (Do Not Balance)

 

REDOX Equations: Writing Net Ionic Reactions
Write net unbalanced ionic reactions for 20 of the following as a post lab report due REDOX Day or the week after as a post lab report:
The following Unbalanced Acid Media REDOX equations need to be re-written ionically Unbalanced.

 

Rewrite the following Unbalanced chemical equations ionically in total ionic form (without balancing), then cancel spectators for the net ionic equation. Do not forget to place charges on the ions and no charge on the molecules/formula units. This is Step#1 in REDOX balancing so the equations can not be balanced first as shown in the book (and as on the test item M-8G.)

Rewrite as ions electrolytes such as soluble salts, strong acids, and strong bases.

(a)    Some strong acids are hydrochloric acid, nitric acid, sulfuric acid, perchloric acid, hydrobromic acid and hydroiodic acid.

(b)   Strong bases include KOH and NaOH and any soluble hydroxide.

(c)    Soluble salts are those ionic compounds with (aq) (water solution: therefore soluble).

 

Redox Equations: Writing Net Ionic Reactions: Acid Media

Write net ionic reactions for all 20 of the following as a post lab report due the day of REDOX lab:

 

1. Zn (s) + HNO3 (aq) Zn(NO3)2 (aq) + NH4NO3 (aq) + H2O (l)

 

 

 

2. KMnO4(aq) + K2C2O4(aq) + HCl(aq) MnCl2(aq) + CO2(g) + KCl(aq) + H2O(l)

 

 

3. K2Cr2O7 (aq) + HCl (aq) CrCl3 (aq) + Cl2 (g) + KCl (aq) + H2O (l)

 

 

 

4. Cu (s) + HNO3 (aq) Cu(NO3)2 (aq) + NO2 (g) + H2O (l)

 

 

 

5. Cu (s) + HNO3 (aq) Cu(NO3)2 (aq) + NO2 (g) + H2O (l)

 

 

 

6. KI (aq) + HNO3 (aq) NO (g) + I2 (s) + KNO3 (aq) + H2O (l)

 

7. K2Cr2O7(aq) + C2H5OH(aq) + HCl(aq) CrCl3(aq) + HC2H3O2(aq)+ KCl(aq) + H2O(l)

 

 

 

8. CH2O (l) + H2SO4 (aq) H2S (g) + CO2 (g) + H2O (l)

 

 

 

9. Zn (s) + HNO3(aq) N2 (g) + Zn(NO3)2 (aq) + H2O

 

 

 

10. Zn (s) + HNO3(aq) N2O (g) + Zn(NO3)2 (aq) + H2O (l)

 

 

 

11. PbO2 (s) + MnO (s) + HNO3(aq) HMnO4(aq) + Pb(NO3)2 (aq) + H2O (l)

 

 

 

12. MnSO4(aq) + K2S2O8(aq) + H2O H2SO4(aq) + MnO2(s) + K2SO4(aq)

 

 

 

13. CdS (aq) + I2 (aq) + H2SO4 (aq) CdSO4 (aq) + HI (aq) + S (s)

 

 

14. KI (aq) + H2SO4 (aq) K2SO4 (aq) + H2S (aq) + I2 (aq) + H2O (l)

 

 

15. K2MnO4 (aq) + H2SO4 (aq) KMnO4 (aq) + MnO2 + K2SO4 (aq) + H2O

 

 

16. H2O2 + KMnO4(aq) + HCl (aq) MnCl2(aq) + KCl(aq) + O2 + H2O

 

 

17. FeS + KNO3(aq) + H2SO4(aq) NO + Fe(NO3)2(aq) + K2SO4(aq)+ KNO3(aq) + H2O

 

 

 

18. As2S5 + KNO3(aq) + HNO3(aq) NO2 + H3AsO4(aq) + KHSO4(aq) + H2O

 

 

 

19. KMnO4 + H2S + HCl MnCl2 + S + KCl + H2O

 

 

 

20. KMnO4 + KNO2 + HNO3 MnO2 + KNO3 + H2O

 

 

 

REDOX Challenge Contest: Basic Media REDOX Equations

Part A2: Rewrite Equations Ionically (Section 4.3) Basic Media 20 points

 

21: Bi2O3(s) + NaOH(aq)+ NaClO(aq) NaBiO3(aq) + NaCl(aq) + H2O(l)

 

 

 

22: Zn(s) + VO2NO3(aq) + H2O(l) + KNO3(aq) Zn(NO3)2(aq) + VO(NO3)2(aq) + KOH(aq)

 

 

 

 

23: V(OH)4Cl(aq)+ SnCl2(aq)+ KCl(aq) VOCl2(aq)+ SnCl4(aq)+ KOH(aq)+ H2O(l)

 

 

 

24: I2(s) + KClO3(aq) + KOH(aq) KIO3(aq) + KCl(aq) + H2O(l)

 

 

 

 

25: Br2(l) + SO2(g) + KOH(aq) KBr(aq) + K2 SO4 (aq) + H2O(l)

 

 

 

 

26: Cr(OH)4Cl(aq) + NaClO(aq)+ NaOH (aq) Na2CrO4(aq) + NaCl(aq) + H2O(l)

 

 

 

27: Zn(s) + NaNO3(aq) + NaOH(aq) + H2O(l) Na2ZnO2(aq) + NH3(g)

 

 

 

28: KMnO4 (aq) + K2C2O4(aq) + KOH (aq) MnO2(s) + K2CO3 (aq) + H2O(l)

 

 

 

29: Zn(s) + NaNO3(aq) + NaOH(aq Na2[Zn(OH)4] (aq) + NH3(g) + H2O(l)

 

30: H2O2(l) + Cl2O7(l) + NaOH(aq) O2(g) + NaClO2 (aq) + H2O(l)

 

 

 

31: KMnO4(aq) + K2C2O4 (aq) + KOH(aq) MnO2(s) + K2CO3 (aq) + H2O(l)

 

 

 

32: KMnO4 (aq) + KIO (aq) + H2O(l) MnO2(s) + KIO4(aq) + KOH(aq)

 

 

33: K2C4H4O6 (aq) + KClO3(aq) + KOH(aq) K2CO3(aq) + KCl (aq) + H2O(l)

34: KMnO4(aq) + KCN(aq) + H2O (l) MnO2(s) + KCNO (aq) + KOH(aq)

 

 

 

35: Na2S(aq) + I2(s) + NaOH (aq) Na2SO4 (aq) + NaI(aq) + H2O (l)

 

 

 

 

36: Cr(OH)3(s) + Cl2(g) + NaOH (aq) NaCl (aq) + Na2CrO4(aq) + H2O(l)

 

 

 

 

37. Fe(OH)2(s) + O2(g) + H2O(l) Fe(OH)3(s)

 

 

 

38. K3Fe(CN)6(aq) + Cr2O3(s) + KOH (aq K4Fe(CN)6 (aq) + K2CrO4 (aq) + H2O(l)

 

 

 

 

 

 

39: NaBH4(aq) + NaClO3(aq NaH2BO3(aq) + NaCl(aq) + H2O(l)

 

 

 

 

40. NaAlH4(aq) + H2CO3(aq) + NaCl(aq) + H2O(l) AlCl3(aq) + CH3OH(l) + NaOH(aq)

 

 

 

 

Module 14 Part B: Redox Equations Sample Test Item 10 points

 

Balance the following redox equations written in net ionic form:

 

Acid Media: 5 points

 

1. C2O4 2- (aq) + MnO4 1- (aq) + H 1+ (aq) Mn 2+ (aq) + CO2 (g) + HOH (l)

 

 

 

 

 

half equation:

 

 

 

 

 

 

half equation:

 

 

 

 

 

 

Basic Media 5 points

 

2. Bi2O3 (s) + OH 1- (aq) + OCl 1- (aq) → BiO3 1- (aq) + Cl 1- (aq) + HOH (l)

 

 

 

 

half equation:

 

 

 

 

 

half equation:

 

 

 

 

 

CHM 2046C REDOX Challenge Contest Pre/Post Lab Report

 

Write and balance the 10 Acid Media, 8 Basic Media Redox, and 2 Neutral Equations. Show the coefficients for these 20 reactions on this page, but neatly show all work for each equation either in your lab manual or on separate paper. (No more than two equations per side of page) Attach this work to this page and submit either before the Contest begins or one week after the Contest ends (directions from your instructor): (If you worked one of the below during the contest, just write the answer on this form and place *completed in contest

Current Reference: McMurry Chapter 4, Sections 4.3, 4.6, 4.7, 4.10

 

Ion-Electron Method or Half Equation Method (McMurry 4.10)

 

 

Acid Media: ((Select 3 of the 7 Net Ionic Equations)

 

Zn + NO3 1- + H 1+ Zn 2+ + NH4 1+ + H2O

 

 

MnO4 1- + C2O4 2- + H 1+ Mn 2+ + CO2 + H2O

 

 

Cr2O7 2- + C2H5OH + H 1+ Cr 3+ + HC2H3O 2 + H2O

 

 

SO4 2- + CH2O + H 1+ H2S + CO2 + H2O

 

 

FeS + NO3 1- + H 1+ NO + Fe 2+ + SO4 2- + H2O

 

 

Cr2O7 2- + Cl 1- + H 1+ Cr 3+ + Cl2 + H2O

 

 

H2O2 + MnO4 1- + H 1+ Mn 2+ + O2 + H2O

 

(

 

(Select 7 of the 8 Total Molecular Equations)

 

MnO + PbO2 + HNO3 ---> HMnO4 + Pb(NO3)2 + H2O

 

 

 

Na2HAsO4 + KBrO3 + HCl ---> NaCl + KBr + H3AsO4

 

 

 

 

WO3 + SnCl2 + HCl ---> W3O4 + H2SnCl6 + H2O

 

 

As2S5 + HNO3 ----> H3AsO4 + NaHSO4 + NO2 + H2O

 

 

 

CuS + HNO3 ----> Cu(NO3)2 + S + NO + H2O

 

 

 

 

Na2C2O4 + KMnO4 + H2SO4 ---> K2SO4 + Na2SO4 + MnSO4 + CO2 +H2O

 

 

 

 

U(SO4)2 + KMnO4 + H2O ---> H2SO4 + K2SO4 + MnSO4 + UO2SO4

 

 

CdS + I2 HCl ---> CdCl2 + HI + S

 

 

 

 

Basic Media (Work four of the five) Net Ionic Equations

 

Cr 3+ + ClO3 1- + OH 1- CrO4 2- + Cl 1- + H2O

 

 

 

Bi2O3 + OH 1- + OCl 1- BiO3 1- + Cl 1- H2O

 

 

 

Mn 2- + Br2 + OH 1- MnO2 + Br 1- + H2O

 

 

 

Fe(OH)2 + O2 + H2O Fe 3+ + OH 1-

 

 

 

MnO4 1- + C2O4 2- + OH 1- + H2O MnO2 + CO3 2-

 

 

Work all four of the following: Total Molecular Equations

 

Zn + NaNO3 + NaOH Na2ZnO2 + NH3 + H2O

 

 

 

 

Ag + KCN- + O2 + H2O KAg(CN)2 + KOH

 

 

 

CoCl2 + Na2O2 + NaOH + H2O ---> Co(OH)3 + NaCl

 

 

 

K3Fe(CN)6 + Cr2O3 + KOH ---> K4Fe(CN)6 + K2CrO4 + H2O

 

 

 

 

 

K2C4H4O6 + KClO3 + KOH K2CO3 + KCl + H2O

 

 

 

 

 

AsO2 1- + ClO 1- AsO3 1- + Cl 1- (basic solution)

 

 

 

 

 

Neutral Media (No H 1+ or OH 1- Ions Present)* * Actually Lewis Acids and Bases

 

The last two below are required, so give them a try!

 

Ca3(PO4)2 (aq) + SiO2 (s) + C (s) CaSiO3 (aq) + P4 (s) + CO (g)

 

 

 

 

Cu(NH3)4Cl2 + KCN + HOH(l) ---> NH3(g) + NH4Cl + K2Cu(CN)3 + KCNO + KCl

 

Homework for the Most Advanced Students #1:

(These Equations are part of the contest beyond Round 12)

Neutral Media:

 

(NH4)2MoO4 + NH4NO3 + Na3PO4 H2O + (NH4)3[P(Mo3O10)4] + NaNO3 + NH3

 

Net Ionic Reaction:

 

 

 

Half Equation:

 

 

 

Half Equation

 

 

 

Final Answer:

 

(NH4)2MoO4 + NH4NO3 + Na3PO4 H2O + (NH4)3[P(Mo3O10)4] + NaNO3 + NH3

 

Acid Media

 

CoCl2 + KNO2 + HC2H3O2 ----> K3Co(NO2)6 + NO + KC2H3O2 + KCl + HOH

 

Net Ionic Reaction:

 

 

 

Half Equation:

 

 

 

 

 

Half Equation

 

 

 

 

Final Answer:

 

CoCl2 + KNO2 + HC2H3O2 ----> K3Co(NO2)6 + NO + KC2H3O2 + KCl + HOH

 

Basic Media

 

CrI3 + KOH + Cl2 ----> K2CrO4 + KIO4 + KCl + HOH

 

Net Ionic Reaction:

 

 

 

 

Half Equation:

 

 

 

 

Half Equation

 

 

 

Final Answer:

CrI3 + KOH + Cl2 ----> K2CrO4 + KIO4 + KCl + HOH

 

Homework for the Most Advanced Students #2:

(Acid Media):

 

K4Fe(CN)6 + H2SO4 + KMnO4 MnSO4 + Fe2(SO4)3 + K2SO4 + KNO3 + CO2 + H2O

 

Net ionic Reaction:

 

 

 

 

Half Equation:

 

 

 

Half Equation

 

 

 

Final Answer:

 

K4Fe(CN)6 + H2SO4 + KMnO4 MnSO4 + Fe2(SO4)3 + K2SO4 + KNO3 + CO2 + H2O

 

(Basic Media):

 

Bi(NO3)3 + Al + NaOH Bi + NH3 + NaAlO2

 

Net ionic Reaction:

 

 

Half Equation:

 

 

 

Half Equation

 

 

 

Final Answer:

 

Bi(NO3) 3 + Al + NaOH Bi + NH3 + NaAlO2

 

(Neutral Media):

 

P2I4 + P4 + H2O PH4I + H3PO4

 

Net ionic Reaction:

 

 

 

Half Equation:

 

 

Half Equation

 

 

 

Final Answer:

 

P2I4 + P4 + H2O PH4I + H3PO4

(Acid Media):

 

As2S5 + KNO3 + HNO3 NO2 + H3AsO4 + KHSO4 + H2O

 

Net ionic Reaction:

 

 

 

 

Half Equation:

 

 

 

 

Half Equation

 

 

 

 

Final Answer:

 

As2S5 + KNO3 + HNO3 NO2 + H3AsO4 + KHSO4 + H2O

 

 

Bonus Exercises

 

The following are deemed the hardest REDOX Equations to balance in the world:

Daughter of All REDOX Equations:
HIO
3 + FeI2 + HCl ---> FeCl3 + ICl + HOH
(A hint: the coefficients of the daughter equation will add up to 66)


 

Son of All REDOX Equations:
CuSCN + KIO3 + HCl ---> CuSO4 + KCi + HCN + ICl + HOH


 

 

 

Father of All REDOX Equations:
NH
4ClO4 + Al ---> HCl + Cl2 + NO + AL2O3 + HOH


 

Mother of All REDOX Equations:
[Cr(N2H4CO)6]4[Cr(CN)6]3 + KMnO4 + H2SO4 --->

 

K2Cr2O7 + MnSO4 + CO2 + KNO3 + K2SO4 + HOH

 

 

 

 

Equation The Ultimate: Acid Media-Total Molecular Form:

 

The Ultimate Equation:

 

 

H2 + Ca(CN)2 + NaAlF4 + FeSO4 + MgSiO3 + KI + H3PO4 + PbCrO4 + BrCl +

 

CF2Cl2 + SO2

PbBr2 + CrCl3 + MgCO3 + KAl(OH)4 + Fe(SCN)3 + PI3 + NaSiO3 + CaF2

 

+ H2O

 

Final Answer:

 

119 H2 + 18 Ca(CN)2 + 6 NaAlF4 + 12 FeSO4 + 6 MgSiO3 + 6 KI + 2 H3PO4 +

 

12 PbCrO4 + 24 BrCl + 6 CF2Cl2 + 24 SO2

 

12 PbBr2 + 12 CrCl3 + 6 MgCO3 + 6 KAl(OH)4 + 12 Fe(SCN)3 + 2 PI3 +

 

6 NaSiO3 + 18 CaF2 + 110 H2O

 

Alternate Answer:

88 H2 + 15 Ca(CN)2 + 6 NaAlF4 + 10 FeSO4 + 3 MgSiO3 + 6 KI + 2 H3PO4

+ 6 PbCrO4 + 12 BrCl + 3 CF2Cl2 + 20 SO2

 



6 PbBr2 + 6 CrCl3 + 3 MgCO3 + 6 KAl(OH)4 + 10 Fe(SCN)3 + 2 PI3 + 3 Na2SiO3 + 15 CaF2 + 79 H2O