Electrochemistry Grade 12 chemistry.pdf

Electrochemistry Grade 12 chemistry ,./ ,./ ,./




oxidation - correct answer ✔ ✔
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the loss of electrons by a chemical entity
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reduction - correct answer ✔ ✔
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the gain of electrons by a chemical enitity
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redox reaction (oxidation - reduction reactions) -
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correct answer ✔ ✔
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are reactions involving a transfer in electrons
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-reactions involving both an oxidation and a reaction
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acronym
LEO says GER - correct answer ✔ ✔ -
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Lose Electrons Oxidation
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-Gain Electron Reduction
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half - reaction equations for REDOX reactions -
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correct answer ✔ ✔ -
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,a half reaction is a balanced equation that shows the number of
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electrons involved in either oxidation or reduction
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-ionic equations are needed to represent a half reaction
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-the 2 half reaction "add up to" the overall equation
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oxidation half reaction - correct answer ✔ ✔
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Oxidation (leo) = e- on the product/ right side ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./




reduction half reaction - correct answer ✔ ✔
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reduction (GER) = e- on the reactant or left side
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the oxidizing agent - correct answer ✔ ✔
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the oxidizing agent if the entity that causes oxidation; it is the
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entity that gets reduced
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the reducing agent - correct answer ✔ ✔
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the reducing agent is the entity that causes reduction; it is the
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entity that gets oxidized
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, oxidation numbers - correct answer ✔ ✔ - ,./ ,./ ,./ ,./ ,./


oxidation numbers are used to keep track of the electron transf
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ers in redox reactions
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for reactions involving covalent reactants and products; you ca
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nnot use ionic charges to describe the transfer of electrons; ho
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wever to assign oxidation numbers to the elements in a covalen
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t molecule or polyatomic ion you can pretend the bonds are ion
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ic
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oxidation numbers therefore are imaginary charges assigned usi
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ng a set of arbitary rules. in a covalently bonded molecule or p
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olyatomic ion the more electronegative atoms are considered to
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be reduced and the less electronegative atoms are considered to
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be reduced
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the oxidation state (oxidation number) of an atom in an entity i
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s defined as the apparent net electric charge that an atom would
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have if electrons in covalent bonds belonged entirely to the mo
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re electronegative atom
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common oxidation numbers - correct answer ✔ ✔ ,./ ,./ ,./ ,./ ,./ ,./


all atoms in elements -(0)-
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Na in Na(s), Br in Br2(l) , Pin P4(s)
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