Oxidation is an increase in the oxidation number

Oxidation is an increase in the oxidation number - •...

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Oxidation is an increase in the oxidation number. Corresponds to the loss of electrons. Mnemonic: Losing Electrons is Oxidation (LEO) Reduction is a decrease in the oxidation number. Good mnemonic – reduction reduces the oxidation number. Corresponds to the gain of electrons Mnemonic: Gaining Electrons is Reduction (GER) LEO the lion says GER! Oxidizing agents are chemical species that: oxidize some other substance contain atoms that are reduced in the reaction gain electrons Reducing agents are chemical species that: reduce some other substance contain atoms that are oxidized in the reaction lose electrons Two examples of oxidation-reduction or redox reactions. KMnO 4 and Fe 2+ Fe 2+ is oxidized to Fe 3+ MnO 4 1- is reduced to Mn 2+
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Unformatted text preview: • Combustion reactions are redox reactions • Combustion of Mg – Mg is oxidized to MgO – O 2 is reduced to O 2-• H 2 SO 3 is oxidized. – The oxidation state of S in H 2 SO 3 is +4. – In SO 4 2-, S has an oxidation state of +6. • O 2 is reduced. – Oxidation state of O in O 2 is 0 – In SO 4 2-, O has an oxidation state of –2. • H 2 SO 3 is reducing agent. • O 2 is oxidizing agent. • In some cases, the same substance can serve as both oxidant and reductant. This is called disproportionation. • Example: Cl 2 + H2O à HCl + HClO – A more oxidized and a more reduced form of Cl is formed. Oxidation number is a useful clue. – Example: 2 H 2 O 2 à 2 H 2 O + O 2 – Example: 2 Cu + à Cu 2+ + Cu...
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This note was uploaded on 10/14/2011 for the course CHEM 1211 taught by Professor Atwood during the Fall '07 term at UGA.

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