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Oxidation Numbers HV2O4- V6+ Is the above equation oxidation or reduction? Oxidation numbers are used to quickly determine if oxidation or reduction has occurred in a redox reaction. Rules for Oxidation Numbers 1. All elements are zero: Oxidation # Rules for Oxidation Numbers 1. All elements are zero: N2 Oxidation # Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 Pb 0 Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Pb 0 Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Pb 0 Na Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Pb 0 Na 0 Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Pb 0 Na 0 O2 Rules for Oxidation Numbers 1. Oxidation # All elements are zero: N2 0 Pb 0 Na 0 O2 0 Rules for Oxidation Numbers 2. Ions are their charge Na+ Oxidation # Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ Br- +1 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Br- -1 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Br- -1 MgSO4 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Br- -1 MgSO4 +2 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Br- -1 MgSO4 +2 Al2O3 Rules for Oxidation Numbers 2. Oxidation # Ions are their charge Na+ +1 Br- -1 MgSO4 +2 Al2O3 -2 Rules for Oxidation Numbers 3. The oxidation number of O in a compound is –2. Na2O Oxidation # Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O CO2 -2 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 CO2 -2 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 CO2 -2 O2 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 CO2 -2 O2 0 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 CO2 -2 O2 0 CH3COOH Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2. Na2O -2 CO2 -2 O2 0 CH3COOH -2 Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2 or in peroxides -1. Na2O -2 CO2 -2 O2 0 CH3COOH -2 HOOH Rules for Oxidation Numbers 3. Oxidation # The oxidation number of O in a compound is –2 or in peroxides -1. Na2O -2 CO2 -2 O2 0 CH3COOH -2 HOOH exception -1 Rules for Oxidation Numbers 4. The oxidation number for H in a compound is +1. Oxidation # Rules for Oxidation Numbers 4. The oxidation number for H in a compound is +1. H2O Oxidation # Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1. H2O +1 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 H2O C12H24O11 +1 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 H2O +1 C12H24O11 +1 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 H2O +1 C12H24O11 +1 H2 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 H2O +1 C12H22O11 +1 H2 0 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 or in metal hydrides -1. H2O +1 C12H24O11 +1 H2 NaH 0 Rules for Oxidation Numbers 4. Oxidation # The oxidation number for H in a compound is +1 or in metal hydrides -1. H2O +1 C12H24O11 +1 H2 NaH 0 -1 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # SO4 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s SO4 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 SO4 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 SO4 Total charge 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 SO4 Total charge -8 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 SO4 Total charge 2- -8 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 SO4 Total charge 2- +6 -8 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +6 -2 SO4 Total charge 2- +6 -8 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +6 -2 SO4 Total charge +6 2- +6 -8 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # PO4 3- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s PO4 3- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 PO4 3- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 PO4 Total charge 3- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 PO4 Total charge -8 3- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 PO4 Total charge 3- -8 = -3 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 PO4 Total charge 3- +5 -8 = -3 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +5 -2 PO4 Total charge 3- +5 -8 = -3 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +5 -2 PO4 Total charge +5 3- +5 -8 = -3 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # Cr2O7 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s Cr2O7 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 Cr2O7 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 Cr2O7 Total charge 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 Cr2O7 Total charge -14 2- Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 Cr2O7 Total charge 2- -14 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 Cr2O7 Total charge 2- +12 -14 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s -2 2- Divide by 2 Cr2O7 Total charge +12 -14 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +6 -2 Cr2O7 Total charge 2- +12 -14 = -2 Rules for Oxidation Numbers 5. All other oxidation numbers are assigned so that the sum of all of the oxidation numbers is equal to the charge on the chemical species. Oxidation # oxidation #s +6 -2 Cr2O7 Total charge +6 2- +12 -14 = -2 Oxidation # Ca(NO3)2 Oxidation # +2 Ca(NO3)2 Oxidation # +2 Ca(NO3)2 +2 Oxidation # Na2C2O4 Oxidation # +1 -2 Na2C2O4 +2 -8 = 0 Oxidation # +1 -2 Na2C2O4 +2 +6 -8 = 0 Oxidation # +1 +3 -2 Na2C2O4 +2 +6 -8 = 0 +3 Oxidation # CH3COOH Oxidation # Rewrite C 2 H4 O2 Oxidation # Rewrite +1 -2 C 2 H4 O2 +4 -4 = 0 0 Oxidation # Zn(OH)42- Oxidation # +2 -2 +1 Zn(OH)42+2 -8 +4 = -2 +2 Oxidation # H2PtCl6 Oxidation # +1 +4 -1 H2PtCl6 +2 +4 -6 = 0 +4 Oxidation # Al(NO3)3 Oxidation # +3 +5 -2 Al(NO3)3 +3 +15 -18 = 0 +5 Oxidation # H3PO3 Oxidation # +1 +3 -2 H3PO3 +3 +3 -6 = 0 +3 Oxidation # Na2O2 Oxidation # +1 -2 Na2O2 +2 -4 = 0 Exception - does not work, O must be -1 Oxidation # +1 -1 -1 Na2O2 +2 -2 = 0 Exception - does not work, O must be -1 Oxidation # CaH2 Oxidation # +2 +1 CaH2 +2 +2 = 0 Exception - does not work, H must be -1 Oxidation # +2 -1 -1 CaH2 +2 -2 = 0 Exception - does not work, H must be -1 Oxidation # Fe(H2O)5(OH)2+ Oxidation # 0 -1 Fe(H2O)5(OH)2+ Water has a charge of 0 OH has a charge of -1 Oxidation # 0 -1 Fe(H2O)5(OH)2+ ? + 0 -1 = +2 Oxidation # 0 -1 Fe(H2O)5(OH)2+ ? + 0 -1 = +3 +2 Oxidation Numbers HV2O4- V6+ Is the above equation oxidation or reduction? Oxidation Numbers +3 HV2O4- +6 V6+ Is the above equation oxidation or reduction? Oxidation Numbers Increase +3 HV2O4- +6 V6+ Is the above equation oxidation or reduction? If the oxidation number increases it is oxidation.
