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Chapter-11-Slides

Chapter-11-Slides - Chapter 11 Electrochemistry Big Idea...

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Chapter 11 Electrochemistry o Redox Reaction Review o Galvanic Cells o Thermo of Electrochemistry o Nernst Equation o Batteries / Fuel Cells o Electrolytic Cells 1 Big Idea: Electron transfer in a chemical reaction is both material and concentration specific. If the process is spontaneous the transfer of electrons can be used to produce a current and drive electrical devices.
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Chapter 11: Electrochemistry Redox Reaction Review Assigning Oxidation Numbers The oxidation number (ON) of an element uncombined with another element is zero: Na(s) ON = 0, and H 2 (g) ON = 0. For monatomic ions, the charge is the ON: Na + ON = +1. The ONs of elements in group 1 equal 1 (ex. Lithium ON = +1) ONs of elements in group 2 equal 2 (ex. Magnesium ON = +2), when the atoms are in a compound. The ON of fluorine is always -1 in compounds. The ON of the other elements in group 7 usually equal -1 when the atoms are in a compound. The ON of oxygen is usually -2 in compounds. Exceptions are fluorine compounds and peroxide (a compound that contains an O-O single bond). Hydrogen's ON is +1 when combined with non metals and -1 when combined with metals. The sum of the ON’s of all the atoms in a species is equal to its total charge. 2
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Chapter 11: Electrochemistry Redox Reaction Review Assigning Oxidation Numbers 3 NaCl Element Oxidation Number Reason Na Cl Fe 2 (SO 4 ) 3 Element Oxidation Number Reason SO 4 O S Fe Br 2 Element Oxidation Number Reason Br
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