4-B - 1 Break reaction into half reactions 2 Balance each...

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1 Types of Chemical Reactions Oxidation–Reduction (Redox) Reaction: A reaction in which one or more electrons are transferred between reaction partners. Mg (s) + Cl 2 ( g ) MgCl 2 ( s )
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2 Redox Reactions How are electrons transferred?? Observe charges on elements: Mg 0 (s) + Cl 2 0 ( g ) MgCl 2 ( s ) Mg 0 (s) + Cl 2 0 ( g ) Mg 2+ + 2Cl - Mg 0 → Mg 2+ + 2 e - 2 e - + Cl 2 0 → 2 Cl - So electrons are TRANSFERRED from Mg to Cl 2
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3 Redox Reactions How are electrons transferred?? 2 e - + Cl 2 0 → 2 Cl - Cl 2 is REDUCED, since the charge on each Cl is lowered Mg 0 → Mg 2+ + 2 e - Mg is OXIDIZED, electrons are removed REDuction + OXidation = REDOX
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4 Redox Reactions Reducing Agent: causes reduction (donates electrons) Oxidizing Agent: causes oxidation (accepts electrons) 2 Mg + O 2 → 2 MgO Oxidizing Agent = O 2 Reducing Agent = Mg
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5 Redox Reactions HALF REACTIONS Mg + Cl 2 → MgCl 2 Break reaction into two separate (HALF) reactions showing electrons Mg 0 → Mg 2+ + 2 e - Cl 2 0 + 2 e - → 2 Cl -
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6 Balancing Redox Reactions HALF REACTION METHOD
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Unformatted text preview: 1. Break reaction into half reactions. 2. Balance each half reaction separately. Use H + and H 2 O as needed to balance atoms. 3. Balance charge in each half reaction by adding electrons to one side of the equation. 7 Balancing Redox Reactions HALF REACTION METHOD 4. Obtain equal number of electrons in each half reaction by multiplying entire equation by a constant. 5. Add the 2 half reactions back together so that the electrons cancel. 6. Convert from acidic to basic (if necessary). Add enough OH-to each side to cancel H + by converting to H 2 O. 8 Balancing Redox Reactions • Balance the following for acidic and basic solution: ClO – ( aq ) + Cr(OH) 4 – ( aq ) → CrO 4 2– ( aq ) + Cl – ( aq ) NO 3 – ( aq ) + Cu( s ) → NO( g ) + Cu 2+ ( aq ) MnO 4 – ( aq ) + IO 3 – ( aq ) → MnO 2 ( s ) + IO 4 – ( aq )...
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This note was uploaded on 02/29/2012 for the course CHM 111 taught by Professor Colyer during the Summer '08 term at Wake Forest.

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4-B - 1 Break reaction into half reactions 2 Balance each...

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