Oxidation And Reduction

Oxidation Process in which atoms or ions attain a more + oxidation state Ex. Na → Na+ + e Cl- → Cl + e Ca+ → Ca2+ + e

Reduction Atoms or ions of elements attain a more negative oxidation state Ex. Cl + e → Cl- Mnemonic: “OIL RIG” Oxidation involves loss, reduction involves gain

Oxidation Number Uncombined elements have oxidation # of 0 Monoatomic ions have oxidation # equal to their ion charge F is always –1 in a compound O is almost always –2 in a compound H is +1 in all compounds except those with metals (then its –1) More electronegative element is assigned a number equal to its ion charge Algebraic sum of oxidation numbers in a compound is always zero

Practice Determine the oxidation numbers for each element in the compounds below NaCl H2SO4 AgNO3 CO2 SF6 NO3-