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| Sixteen balance redox equations by sight | |||
Discussion and twenty examples
Example #1: H2 + O2 ---> H2O
Example #2: H2 + Cl2 ---> HCl
Example #3: O2 ---> O3
Example #4: Na + H2O ---> NaOH + H2
Example #5: Fe + CuSO4 --> Cu + FeSO4
Example #6: Zn + HCl ---> ZnCl2 + H2
Example #7a: KClO3 ---> KCl + O2
Example #7b: KClO3 ---> KClO4 + KCl
Example #7c: H3PO3 ---> H3PO4 + PH3
Example #8: S8 + F2 ---> SF6
Example #9: Fe + O2 ---> Fe2O3
Example #10: C2H6 + O2 ---> CO2 + H2O
Example #11-13: Balance these three equations using fractional coefficients:
S8 + F2 ---> SF6C4H10 + O2 ---> CO2 + H2O
S8 + O3 ---> SO2
Example #14a: H2 + O3 ---> H2O (You must balance it with one restriction: the coefficient in front of the water must be a one.)
Example #14b: Na + NH3 ---> NaNH2 + H2 (balance with a fraction)
Example #15a: P4 + O2 ---> P2O5
Example #15b: N2 + O2 ---> N2O5
Example #16: KFe3AlSi3O10(OH)2 + Cu + O2 + H2S ---> KAlSi3O8 + CuFeS2 + H2O
Example #17: SiO2 + CaC2 ---> Si + CaO + CO2
Example #18: NH3(g) + O2(g) ---> NO2(g) + H2O(g)
Example #19: MgNH4PO4 ---> Mg2P2O7 + NH3 + H2O
Example #20: Balance:
PCl5 + H2O ---> H3PO4 + HCl
using the LCM method.
Bonus Example #1: Balance:
K4Fe(CN)6 + H2SO4 + H2O ---> K2SO4 + FeSO4 + (NH4)2SO4 + CO
Bonus Example #2: C3H7S(ℓ) + O2(g) ---> CO2(g) + H2O(ℓ) + SO2(g)
Problem #1: FeCl3 + MgO ---> Fe2O3 + MgCl2
Problem #2: Li + H3PO4 ---> H2 + Li3PO4
Problem #3: ZnS + O2 ---> ZnO + SO2
Problem #4: FeS2 + Cl2 ---> FeCl3 + S2Cl2
Problem #5: Fe + HC2H3O2 ---> Fe(C2H3O2)3 + H2
Problem #6: H2(g) + V2O5(s) ---> V2O3(s) + H2O(ℓ)
Problem #7: HCl(aq) + MnO2(s) ---> MnCl2(aq) + Cl2(g) + H2O(ℓ)
Problem #8: Fe2O3(s) + C(s) ---> Fe(s) + CO2(g)
Problem #9: C5H11NH2 + O2 ---> CO2 + H2O + NO2
Problem #10: CO2 + S8 ---> CS2 + SO2
Bonus Problem: P4 + O2 ---> P2O3
Problem #11: NH3(g) + N2O(g) ---> N2(g) + H2O(g)
Problem #12: NH3 + O2 ---> NO + H2O
Problem #13: NH3 + Cl2 ---> N2H4 + NH4Cl
Problem #14: NH3 + F2 ---> N2F4 + HF
Problem #15: NH3 + F2 ---> NH4F + NF3
Problem #16: NH4NO3(s) ---> N2(g) + O2(g) + H2O(g)
Problem #17: N2O + CH4 ---> N2 + CO2 + H2O
Problem #18: NO2 + O2 + H2O ---> HNO3
Problem #19: NO2 + H2O ----> HNO3 + NO
Problem #20: N2(g) + O2(g) + H2O ---> HNO3
Problem #21: N2H4 + N2O4 ---> N2 + H2O
Problem #22: N2H4 + H2O2 ---> N2 + H2O
Problem #23: N2O4 + H2O ---> HNO3 + NO
Problem #24: NaOH + Al --> Al2O3 + H2 + Na2O
Problem #25: KMnO4 ---> K2O + MnO + O2
Bonus Problem: CaF2 ⋅ 3Ca3(PO4)2 + H2SO4 + H2O ---> H3PO4 + HF + CaSO4 ⋅ 2H2O
Problem #26: Ca(AlO2)2(s) + HCl (aq) ---> AlCl3(aq) + CaCl2(aq) + H2O(ℓ)
Problem #27: C6H6 + H2O2 ---> CO2 + H2O
Problem #28: Fe + O2 + H2O ---> Fe(OH)2
Problem #29: MgNH4PO4 ---> Mg2P2O7 + NH3 + H2O
Problem #30: AlCl3(s) + Ca3N2(s) ---> AlN(s) + CaCl2(s)
Problem #31: HNCO ---> C3N3(NH2)3 + CO2
Problem #32: CdS + O2 ---> Cd + SO2
Problem #33: KAlSi3O8 + CO2 + H2O ---> Al2Si2O5(OH)4 + H4SiO4 + KHCO3
Problem #34: CH3CCl3 + O2 ---> CO2 + H2O + Cl2
Problem #35: CO + Fe3O4 ---> CO2 + Fe
Problem #36: H2S + CO -----> CH3COOH + S8
Problem #37: H2S(g) + SO2(g) ---> S8(s) + H2O(g)
Problem #38: FeSO4 ---> Fe2O3 + SO2 + SO3
Problem #39: Pb(NO3)2 + FeCl3 ---> Fe(NO3)3 + PbCl2
Problem #40: C3H5(NO3)3 ---> CO2 + H2O + N2 + O2
Problem #41: CO(NH2)2 + NO2 ---> CO2 + H2O + N2
Problem #42: C2H2 + O2 ---> CO2 + H2O
Problem #43: Ag2O + NH4OH + NH4NO3 ----> [Ag(NH3)2]NO3 + H2O
Problem #44: HClO4 + P4O10 ---> H3PO4 + Cl2O7
Problem #45: C4H10S + O2 ---> CO2 + H2O + SO2
Bonus Problem: CaF2 ⋅ 3Ca3(PO4)2 + H2SO4 + H2O ---> Ca(H2PO4)2 + HF + CaSO4 ⋅ 2H2O
Problem #46: NaBH4 + BF3 ---> NaBF4 + B2H6
Problem #47: C5H7O + O2 ---> CO2 + H2O
Problem #48: NaOH + P4 + H2O ---> NaH2PO2 + PH3
Problem #49: NBr3 + NaOH ----> N2 + NaBr + HOBr
Problem #50: VO + Fe2O3 ---> FeO + V2O5
Problem #51: Fe2O3(s) + CO(g) ---> Fe(s) + CO2(g)
Problem #52: S2H5 + O2 ---> SO2 + H2O
Problem #53: KOH + F2 ---> KF + F2O + H2O
Problem #54: Al + KOH + H2SO4 + H2O ----> KAl(SO4)2 · 12H2O + H2
Problem #55: KAl(SO4)2 · 12H2O + BaCl2 ---> KCl + AlCl3 + BaSO4 + H2O
Problem #56: C10H22 ---> C4H10 + C2H4
Problem #57: NH2CH2COOH(s) + O2(g) ---> CO2(g) + H2O(ℓ) + N2(g)
Problem #58: C3H5O9N3 ---> CO2 + N2 + O2 + H2O
Problem #59: C20H45 + O2 ---> CO2 + H2O
Problem #60: C3H5 + O2 ---> CO2 + H2O
Problem #61: C5H11SO2N + O2 ---> CO2 + H2O + SO2 + NO2
Problem #62: Ca(OH)2 + C4H6O5 ---> H2O + CaC4H4O5
Problem #63: FeTiO3 + Cl2 + C ---> TiCl4 + FeCl3 + CO
Problem #64: Ca3P2(s) + H2O(ℓ) ---> Ca(OH)2(aq) + PH3(g)
Problem #65: TiCl4(ℓ) + H2O(ℓ) ---> TiO2(s) + HCl(aq)
Problem #66: Cu2O + O2 ---> CuO
Problem #67: FeSO4(NH4)2SO4 ⋅ 6H2O + H2C2O4 ⋅ 2H2O ---> FeC2O4 ⋅ 2H2O + NH4HSO4 + H2O
Problem #68: BCl3 + P4 + H2 ---> BP + HCl
Problem #69: NH3 + KAl(SO4)2 ⋅ 12H2O ---> Al(OH)3 + (NH4)2SO4 + KOH + H2O
Problem #70: FeS2 + O2 ---> Fe2O3 + SO2
Problem #71: C11H12N2O2 + O2 ---> CO2 + H2O + N2
Problem #72: FeCl3 ⋅ 6H2O + K2C2O4 ⋅ H2O ---> K7[Fe(C2O4)5(H2O)4] + KCl + H2O
Problem #73: Mg(NO3)2 ---> MgO + NO2 + O2
Problem #74: VF5 + HI ---> V2I10 + HF
Bonus Problem: Na2CO3 + C + N2 ---> NaCN + CO2
| Problems 1-10 | Problems 11-25 | Problems 26-45 | Problems 46-65 |
| Six "balancing by groups" problems | Fifteen examples | Return to Equations Menu | |
| Sixteen balance redox equations by sight | |||