ib chemistry on redox, oxidation, reduction and oxidation number
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IB Chemistry on Redox, Oxidation, Reduction and Oxidation number.TRANSCRIPT
http://lawrencekok.blogspot.com
Prepared by Lawrence Kok
Video Tutorial on Redox, Oxidation, Reduction and oxidation number.
Video on Redox and Oxidation Number
Oxidation number acoss period
Redox reaction from Khan Academy
IB Chemistry Redox half reaction
Redox reaction from Khan academy
Oxidation calculation
Redox (Oxidation and Reduction)
Oxidation – Gain of oxygen ↑
Oxidation – Loss of hydrogen ↓ Reduction – Gain of hydrogen ↑
Reduction – Loss of oxygen ↓
Oxidation Number / State
• Arbitary /Imaginary charge assign to an element• Imagining electrons shared will move to a more electronegative atom
Oxidation Number / State
• Arbitary /Imaginary charge assign to an element• Imagining electrons shared will move to a more electronegative atom
Electron moving to CI Electron moving to C Electron moving to CI
Electron moving to O Electron moving to N Electron moving to O
• Oxidation number for oxygen is usually (-2) BUT will change if attached toa more electronegative atom like Fluorine
Oxidation Number / State
Oxidation number oxygen change from (-2) → (+2)
• Oxidation number for oxygen is usually (-2) BUT will change if attached toa more electronegative atom like Fluorine
• Oxidation number for Gp 7 (CI, Br, I) is usually (-1) BUT will change if attach toa more electronegative atom like oxygen
Oxidation Number / State
Oxidation number oxygen change from (-2) → (+2)
Oxidation number group 7 change from (-1) → (+1)
• Oxidation number for oxygen is usually (-2) BUT will change if attached toa more electronegative atom like Fluorine
• Oxidation number for Gp 7 (CI, Br, I) is usually (-1) BUT will change if attach toa more electronegative atom like oxygen
Oxidation Number / State
Oxidation number oxygen change from (-2) → (+2)
Oxidation number group 7 change from (-1) → (+1)
• Oxidation number for an atom or molecule of an element (NOT combined to formcompound) is always = ZERO (O)
Oxidation Number / State
• Oxidation number for Polyatomic Ions
Sum of oxidation number for polyatomic ion = Charge on the ion
Oxidation Number / State
• Oxidation number for Polyatomic Ions
Sum of oxidation number for polyatomic ion = Charge on the ion
• Sum of oxidation number of all atoms present is EQUAL to the CHARGE of ion
Oxidation Number / State• Oxidation number for monoatomic cations
MONOATOMIC ION -- Oxidation Number = Charge on ion
• Oxidation number for cation = Charge on ion
• Metal with more than > ONE oxidation number, Roman numeral is used
Oxidation Number / State
• Oxidation number for NON-METALS -- Electronegative → (-ve)
• Oxidation number for METALS -- Electropositive → (+ve)
Oxidation Number / State• Oxidation Number for Ionic Compound
Oxidation number S = +4 Oxidation number S = +6 Oxidation number N = +3 Oxidation number N = +5
Oxidation Number / State• Oxidation Number for Ionic Compound
Oxidation number S = +4 Oxidation number S = +6 Oxidation number N = +3 Oxidation number N = +5
Oxidation number Mn = +2 Oxidation number Mn = +4 Oxidation number S = +6 Oxidation number Mn = +7
Oxidation Number / State• Oxidation Number for Ionic Compound
Oxidation number S = +4 Oxidation number S = +6 Oxidation number N = +3 Oxidation number N = +5
Oxidation number Mn = +2 Oxidation number Mn = +4 Oxidation number S = +6 Oxidation number Mn = +7
Oxidation number Cr= +6 Oxidation number Cr = +6 Oxidation number N = +5 Oxidation number C = +4
Oxidation Number / StateExample: Determine the oxidation number for element below
1) V in V2O5
6) C in C2H3CI35) C in CH3CI4) O in F2O
3) O in CI2O2) Sn in SnCI4
Oxidation Number / StateExample: Determine the oxidation number for element below
1) V in V2O5
6) C in C2H3CI35) C in CH3CI4) O in F2O
3) O in CI2O2) Sn in SnCI4
Determine the oxidation number for the underlined elements
1) (SO4)2- 2) (SO3)2- 3) (OCI )- 1 4) (HCO3)-1
5) (MnO4)-1 7) H2 O 2
Oxidation Number / State
6) (F2O )
Determine the oxidation number for the underlined elements
1) (SO4)2- 2) (SO3)2- 3) (OCI )- 1 4) (HCO3)-1
5) (MnO4)-1 7) H2 O 2
Oxidation Number / State
Oxidation number for oxygen usually (-2) BUT (-1) in peroxide
6) (F2O )
Oxidation number for oxygen usually (-2) BUT (+2) if bond to more electronegative fluorine
• Charges on Anion and Polyatomic ion
Oxidation Number / State
• Charges on cations and oxidation number
Video on Redox and Oxidation Number
Oxidation number acoss period
Redox reaction from Khan Academy
IB Chemistry Redox half reaction
Redox reaction from Khan academy
Oxidation calculation
Acknowledgements
Thanks to source of pictures and video used in this presentation
Thanks to Creative Commons for excellent contribution on licenseshttp://creativecommons.org/licenses/
Prepared by Lawrence Kok
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