chapter5 - 4.4 Oxidation-Reduction (or redox) Reactions...

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1 4.4 Oxidation-Reduction (or redox) Reactions – electrons are transferred between reactants 1. Oxidation and Reduction In redox reaction: A substance loses electrons. The loss of electrons by a substance is called oxidation. The substance that loses electrons is oxidized and this substance is reducing agent (reductant). A substance gains electrons. The gain of electrons by a substance is called reduction. The substance that gains electrons is reduced and this substance is oxidizing agent (oxidant). Example: reaction can be thought as two separate parts: oxidation and reduction Two good mnemonics for redox reactions: – LEO ( L ose E lectrons O xidation) the lion says GER ( G ain E lectrons R eduction); – OIL RIG : o xidation i nvolves l oss of electrons, r eduction i nvolves g ain of electron
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2 2. Oxidation Numbers (oxidation states): • Oxidation numbers simplify the electron bookkeeping. • Oxidation number is either the actual charge for a monatomic ion or a hypothetical charge assigned to the atom assuming that the electrons are completely held by one atom or the other. • Oxidation numbers are required for the proper
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chapter5 - 4.4 Oxidation-Reduction (or redox) Reactions...

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