Oxidation States Questions and Problems

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Oxidation states Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. The oxidation state for an element in a chemical formula is calculated from the overall charge and postulated oxidation states for all the other atoms: 1.) An element in a free form has oxidation state = 0. 2.) In a compound or ion, the oxidation states' sum equals the total charge of the compound or ion. 3.) Fluorine in compounds has oxidation state = −1; this extends to chlorine and bromine only when not bonded to a lighter halogen, oxygen or nitrogen. 4.) Group 1 and group 2 metals in compounds have oxidation state = +1 and +2, respectively. 5.) Hydrogen has oxidation state = +1, but adopts −1 when bonded as a hydride to metals or metalloids. 6.) Oxygen in compounds has oxidation state = −2. Questions and problems: 1.) What is the oxidation number of the nitrogen atom in each the following compounds and ions? ammonia, NH3: -3 hydroxylamine, NH2OH: -1 dinitrogen monoxide, N2O: +1 dinitrogen pentoxide, N2O5: +5 sodium nitrite, NaNO2: +3 sodium nitrate, NaNO3: +5 + ammonium ion, NH4 : -3 - azanide (amide) ion: NH2 : -3 - nitrite ion, NO2 : +3 - nitrate ion, NO3 : +5 2.) Give the oxidation numbers of all the atoms in the following compounds: -4; +1 -2; +1; -2; +1 -3; +1; +3; -2; -2; +1 +2; -2 +4; -2 CH4; C2H5OH; CH3COOH; CO; CO2; Need help with organic molecules? Since the bond between two carbons is non-polar, sum of oxidation states of carbon and all other atoms bonded to it must remain 0. Example: We can split acetic acid into two parts: The two carbons in CH3COOH have oxidation states of -3 and +3 respectively. 3.) What is the oxidation number of sulfur in each the following compounds? hydrogen sulphide, H2S: sulfur, S: sulfur dioxide SO2: sulfur trioxide, SO3: sodium sulphite, Na2SO3: 1 sodium sulfate, Na2SO4: sulfid ion, S2-: bisulfide ion, HS-: 2- sulfite ion, SO3 : 2- sulfate ion, SO4 : 2- thiosulfate ion, S2O3 : 2- disulfid ion, S2 : 4.) What is the oxidation number of manganese in each the following compounds? potassium permanganate, KMnO4: manganese(II) sulfate, MnSO4: manganese dioxide, MnO2: 2 .

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