CM-UY 1004 Lecture 4: Chem Review Chapter's 4.4-4.5 Reactions
31 Jul 2016
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4. 4 oxidation- reduction reactions but not all do. Redox reactions are considered electron transfer reactions cumbersome to deal with. Oil rig: oxidation is loss, reduction is gain. Half reactions explicitly shows the electrons involved in a redox reaction note: the extent of oxidation = Oxidation reaction refers to the half reaction that involves loss of electrons the extent of reduction. Reduction reaction refers to the half reaction that involves gain of electrons by reducing agent = electrons. The reducing agent donates electrons gained by oxidizing agent. Oxidation number aka oxidation state = number of charges the atom would have in a molecule or ionic compound, if the electrons were transferred completely. Free elements have oxidation number of 0 note: Monatomic ions have oxidation number = to their charge to oxidation number. Oxygen has a number of -2 unless in h. Hydrogen has number of +1 unless bonded to a metal in binary compounds (lih, nah ); its number is -1.
