ElectroChemistry

ElectroChemistry - Glen D'Souza Sannan Jamil Vinnopaul...

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Glen D’Souza Sannan Jamil Vinnopaul Gupta Aka VINNO VIJAYAKUMAR Austin
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Oxidation And Reduction
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Reduction is the addition or gain of electrons l Oxidation is the loss of electrons l The total number of electrons gained must equal the total number of electrons lost l A redox reaction is a chemical reaction in which electrons are transferred between particles l Oxidation number is a positive or negative number that corresponds to the change that an atom in a molecule would have l Atoms is element form has the oxidation number 0 l Hydrogen has the oxidation number +1 (HCl) l Hydrogen in hydrides has a charge of -1 (LiH) l Oxygen has the oxidation number of -2 (H 2 O) l Oxygen in peroxides has the oxidation number of -1 (H 2 O 2 )
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x +1 l C H 4 l x+ 4(+1)=0 l x = 0-4 l x = -4 l The charge of carbon in methane is - 4
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Reduction l F 2 + 2 e− → 2 F l Oxidation l H 2 → 2 H + + 2 e− H 2 O 2(+1) + (-2) = 0 SO 4 2- (+6) + 4(-2) = - 2 SO 2 (+4) + 2(-2) = 0
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Balancing Redox Equasions
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1. Assign oxidation numbers and identify the atoms/ions whose oxidation numbers change 2. Use the change in oxidation numbers, write he number of electrons transferred per atom 3. Determine the number of electrons transferred per reactant 4. Calculate the simplest whole number coefficients for the reactants that will balance the total number of electrons transferred. Balance the reactants and products 5. Balance the O atoms using H 2 O and then balance H atoms by using H+ For Basic Solutions 1. Add OH- to both sides equal to the number of H+ present 2. Combine H+ and OH- on the same side to form H 2 O and cancel the same number of H 2 O on both sides
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MnO 4 1- + Fe 2+ → Mn 2+ + Fe 3+
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Step 1 Divide the skeleton equation into half-reactions. Step 2 Balance atoms other than H and O.
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ElectroChemistry - Glen D'Souza Sannan Jamil Vinnopaul...

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