Redox and Electrochemistry

Redox and Electrochemistry - Oxidation OxidationReduction...

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Oxidation Reduction and Electrochemistry David A. Katz Department of Chemistry ima Community College Pima Community College
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xidation eduction Reactions Oxidation Reduction Reactions an oxidation duction ( edox reaction, In an oxidation reduction (Redox) reaction, electrons are transferred from one species to another. For example, in a single replacement reaction Cu ) + 2 AgNO ( q ± 2 Ag ) + Cu(NO ) ( q (s) 3 (aq) (s) 3 2 (aq) he Cu atoms lose electrons to form Cu 2+ the The Cu atoms lose electrons to form Cu in the Cu(NO 3 ) 2 and the Ag + gains electrons to form metallic Ag
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xidation eduction Reactions Oxidation Reduction Reactions This can be more easily observed by writing the net ionic equation for the reaction: Cu ) + 2 Ag + q ± 2 Ag ) + Cu 2+ q (s) (aq) (s) (aq) The metallic Cu atoms are uncombined, so they are , y considered to have an oxidation number of zero. The combined Ag atoms are in a +1 oxidation state. ch Cu atom will lose 2 electrons to 2 Ag ns Each Cu atom will lose 2 electrons to 2 Ag + ions The resulting Ag atoms are considered to have an oxidation number of zero
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Oxidation Reduction Reactions Cu (s) + 2 Ag + (aq) ± 2 Ag (s) + Cu 2+ (aq)
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xidation Numbers Oxidation Numbers In order to keep track of what loses electrons and what gains them, we list e xidation the oxidation numbers of each lement. element.
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xidation and Reduction Oxidation and Reduction A species is oxidized when it loses electrons. ere zinc loses two electrons to go from neutral zinc Here, zinc loses two electrons to go from neutral zinc metal to the Zn 2+ ion.
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xidation and Reduction Oxidation and Reduction A species is reduced when it gains electrons. ere each of the H + ins an electron and they Here, each of the H gains an electron and they combine to form H 2 .
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xidation and Reduction Oxidation and Reduction The species that contains the element that is reduced is the oxidizing agent . H + oxidizes Zn by taking electrons from it. The species that contains the element that is oxidized is the reducing agent . Zn reduces H + by giving it electrons.
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ssigning Oxidation Numbers Assigning Oxidation Numbers ements in their elemental form have an 1. Elements in their elemental form have an oxidation number of 0. he oxidation number of a monatomic ion 2. The oxidation number of a monatomic ion is the same as its charge.
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ssigning Oxidation Numbers Assigning Oxidation Numbers The oxidation number of metals depends 3. on their position in the periodic table roup IA elements are +1 Group IA elements are +1 Group IIA elements are +2 roup IIIA elements are +3 Group IIIA elements are +3 Group IVA metals are usually +2 or +4 Group VA metals are usually +3 or +5
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ssigning Oxidation Numbers Assigning Oxidation Numbers . Nonmetals nd to have negative 4. tend to have negative oxidation numbers, although some are positive in certain compounds or ions.
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This note was uploaded on 12/07/2011 for the course CHEM 152 taught by Professor Staff during the Spring '08 term at Pima CC.

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Redox and Electrochemistry - Oxidation OxidationReduction...

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