CHEM 1210 Lecture 14: Chem 1210 lecture 14
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22 Sep 2018
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These are reactions involving electron transfer from one reactant to another. Many common reactions talked about are redox. Example: statue of liberty is made of copper, the oxidation of copper causes a blue/green color to form. The statue used to be copper colored, now it is blue/green because of oxidation. Example: the use of batteries has a redox reaction in it: 2 arrow means that this reaction can be undone. In this case, it is undone by recharging the battery. Oxidation is the loss of electrons by a substance. Reduction is the gaining of electrons by a substance. Oxidation state/oxidation number of an atom is a hypothetical charge that follows: oxidation number of element in elemental form= 0 (examples: h , O , p , fe ) no loss or gain of electron. 4: monatomic ions is its charge (ex: na+--> +1, mg2+--> 2+, s2---> -2) iii. Sum of oxidation number of atoms is equal to total charge (ex:
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