Th 10_21_10 Chapter 6

Th 10_21_10 Chapter 6 - Oxidation-Reduction Reactions: An...

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Oxidation-Reduction Reactions: An Introduction • Oxidation is an increase in the oxidation number number. – Corresponds to the loss of electrons. • Reduction is a decrease in the oxidation number. – Good mnemonic – reduction reduces the oxidation number 67 oxidation number. – Corresponds to the gain of electrons • Leo goes Ger Oxidation-Reduction Reactions: An Introduction Oxidizing agents are chemical species that: 1. oxidize some other substance 2. contain atoms that are reduced in the reaction 3. gain electrons Reducing agents are chemical species that: 1. reduce some other substance 68 2. contain atoms that are oxidized in the reaction 3. lose electrons
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Oxidation-Reduction Reactions: An Introduction • Two examples of oxidation-reduction or redox Two examples of oxidation reduction or redox reactions. •KM nO 4 and Fe 2+ –Fe 2+ is oxidized to Fe 3+ –MnO 4 1- is reduced to Mn 2+ Combustion reactions 69 are redox reactions • Combustion of Mg – Mg is oxidized to MgO –O 2 is reduced to O 2- Oxidation-Reduction Reactions: An Introduction • Example 4-2: Write and balance the formula unit, total ionic, and net ionic equations for the oxidation of sulfurous acid to sulfuric acid by oxygen in acidic aqueous solution. • Formula unit equation SO H 2 O SO H 2 70 • Total ionic equation You do it!      aq 4 2 g 2 aq 3 2   2 4(aq) (aq) g 2 aq 3 2 SO 2 H 4 O SO H 2
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Oxidation-Reduction Reactions: An Introduction • Net ionic equation You do it! Which species are oxidized and reduced?   2 4(aq) (aq) g 2 aq 3 2 SO 2 H 4 O SO H 2 71 • Identify the oxidizing and reducing agents. You do it! Oxidation-Reduction Reactions: An Introduction • 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. 72 •H 2 SO 3 is reducing agent. 2 is oxidizing agent.
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Combination Reactions Combination reactions occur when two or more substances combine to form a more substances combine to form a compound. There are three basic types of combination reactions. 1. Two elements react to form a new compound 2. An element and a compound react to form one new compound 73 3. Two compounds react to form one compound Combination Reactions 1. Element + Element Compound A. Metal + Nonmetal Binary Ionic Compound    s g 2 s NaCl 2 Cl Na 2 74
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Combination Reactions 1. Element + Element Compound B. Nonmetal + Nonmetal Covalent Binary Compound     s 10 4 g 2 s 4 O P O 5 P 75 Combination Reactions 1. Element + Element Compound C. Other Examples A. Metal + Nonmetal
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This note was uploaded on 10/28/2010 for the course CHEM 1211 taught by Professor Bro during the Spring '10 term at Université de Genève.

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Th 10_21_10 Chapter 6 - Oxidation-Reduction Reactions: An...

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