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Notes - Section 4.4-4.6

Notes - Section 4.4-4.6 - Paul Jackman October 6 2009...

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Paul Jackman October 6, 2009 Chemistry CHE 106 – M029 Section 4.4-4.6 Notes 4.4 Oxidation-Reduction Reactions A reaction in which electrons are transferred between reactants is called an oxidation-reduction, or redox, reaction Oxidation and Reduction Corrosion is the conversion of a metal into a metal compound by a reaction between the metal and some substance in the environment. Loss of electrons by a substance is called oxidation When an atom, ion, or molecule has become more negatively charged (gained electrons), we say that it is reduced The gain of electrons by a substance is called reduction Oxidation Numbers Each atom in a neutral molecule or charged species is assigned an oxidation number Assigned with these rules: o For an atom in its elemental form, the oxidation number is always zero (each H atom in H 2 is 0) o For any monatomic ion the oxidation number equals the charge of the ion (K + oxidation number is +1 o Nonmetals usually have negative oxidation numbers
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