jChapter 11 - Chapter 11 RedOx Batteries Oxidation and...

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Chapter 11 RedOx Batteries Oxidation and Combustion
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Oxidation and Reduction Redox Half reactions Electrochemistry Fuel cells Batteries Oxygen Corrosion Combustion
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What is Redox? Redox is a type of reaction that involves reduction and oxidation Reduction is the process by which one reactant gains one or more electrons Oxidation is the process by which one reactant loses one or more electrons
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Pneumonics LEO the lion says GER L oss of E lectrons is O xidation G ain of E lectrons is R eduction OIL RIG O xidation I s L oss of electrons R eduction I s G ain of electrons
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Oxidation When something becomes oxidized the element/molecule will become more positive Ex. Mn+2 → Mn+4 O-2 → O K → K+1
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Reduction When an element/molecule becomes reduced it will become more negative Ex. Cl → Cl-1 Cr+7 → Cr+2 O → O-2
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A redox reaction The formation of NaCl from sodium metal and chlorine gas is as follows: 2Na(s) + Cl2(g) → 2NaCl(s) To follow what really happens to the individual electrons we need to look at the reaction of each element by itself This is called a half reaction
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Let’s start with sodium 2Na → 2Na+ + 2e- Here we see that the sodium gave up one electron each to form a +1 ion This is a loss of electrons (reactant gave up one electron each to become the products) L oss of E lectron is O xidation ( O xidation i s L oss) Thus this half of the reaction is the oxidation reaction
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To be a redox reaction something must be oxidized (Na) and something must be reduced (Cl) Thus the other half of the reaction is as follows: Cl2 + 2e- → 2Cl-
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