CHM 2045C REDOX Challenge Contest Pre/Post
Lab Report
Name________________________________ Date____________
Acid Media: ((Select 3 of the 7 Net Ionic Equations)
MnO4 1- + C2O4
2- + H 1+ à Mn 2+ + CO2 + H2O
Cr2O7 2- + C2H5OH
+ H 1+ à Cr 3+ + HC2H3O
2 + H2O
SO4 2- + CH2O
+ H 1+
à H2S + CO2 + H2O
Cr2O7 2- + Cl
1- + H 1+ à Cr 3+ + Cl2 + H2O
H2O2 + MnO4
1- + H 1+ à 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
Bi2O3 + OH 1- + OCl 1- à BiO3 1- + Cl 1- H2O
Mn 2-
+ Br2
+ OH 1- à MnO2
+
Br 1- + H2O
Fe(OH)2 + O2 +
H2O à Fe 3+ + OH 1-
MnO4 1- +
C2O4 2- +
OH 1- + H2O
à MnO2 +
CO3 2-
Work all
four of the following: Total Molecular Equations
Zn + NaNO3
+
NaOH à Na2ZnO2 +
NH3 + H2O
Ag + KCN- + O2 + H2O à KAg(CN)2 + KOH
CoCl2 + Na2O2 +
NaOH + H2O --->
Co(OH)3 + NaCl
K3Fe(CN)6 + Cr2O3 +
KOH ---> K4Fe(CN)6 + K2CrO4 + H2O
N2H4 +
O2 à N2 +
H2O2
(basic solution)
AsO2 1- +
ClO 1- à AsO3 1- +
Cl 1- (basic
solution)
‘Neutral’ Media (No H 1+
or OH 1- Ions Present)*
The last two below are
required, so give them a try!
Ca3(PO4)2 + SiO2 + C à CaSiO3 + P4 + CO
Cu(NH3)4Cl2 +
KCN + HOH ---> NH3 + NH4Cl + K2Cu(CN)3
+ KCNO +
KCl
* Actually Lewis Acids and Bases
Homework for the Most Advanced Students:
(These
Equations are part of the contest beyond Round 12)
Neutral Media:
1.Cu(NH3)4Cl2 +
KCN + HOH ---> NH3 + NH4Cl + K2Cu(CN)3
+ KCNO +
KCl
half equation:
half equation:
Acid Media
2. CoCl2 + KNO2 + HC2H3O2 ----> K3Co(NO2)6 + NO +
KC2H3O2 + KCl
+ HOH
half equation:
half equation:
Basic Media
3. CrI3 + KOH + Cl2 ---->
K2CrO4
+ KIO4 +
KCl + HOH
half equation:
half equation:
The following are deemed the hardest REDOX Equations to
balance in the world:
Equation The Ultimate: Acid Media-Total Molecular Form:
The Ultimate Equation:
H2 + Ca(CN)2 + NaAlF4 + FeSO4 + MgSiO3 + KI + H3PO4
+ PbCrO4 + BrCl +
CF2Cl2 + SO2
è
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
è
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
è
6 PbBr2 + 6 CrCl3
+ 3 MgCO3 + 6 KAl(OH)4 + 10
Fe(SCN)3 + 2 PI3 + 3 Na2SiO3 + 15 CaF2
+ 79 H2O