Balance these equations using the change-in-oxidation-number method: HNO3 + S ——> NO2 + H2SO4 + H2O 1) What are the coefficients of the balance equation? 2) What is the total number of electrons lost/gained? 3) What is the substance that undergo oxidation reaction? reduction reaction? 4) Which of the reactants is the oxidizing agent? reducing agent? 5) Which substance was oxidized? reduced? 6) Which compound is the product of oxidation? product of reduction?

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Balance the following equations using Oxidation Number method and explain how they are the same in a sentence. 1. l 2 +HNO 3 -----> HIO 3 +NO 2 +H 2 O 2. HBr + HBrO 3 ----> Br 2 + H 2 O

For each of the following reactions, identify the elements that are oxidized and reduced, the oxidizing and reducing agents, and how many moles of electrons are transferred in the overall reaction. a. 4Fe(s) + 302(g) → 2Fe2O3(s) b. 2Ag(s) + H2S(g) → Ag2S(s) + H2(g) c. 2 Al(s) + 3 CuCl2(aq) → 2 AlCl3(aq) + 3 Cu(s) d. 2NaHCO3(s) → Na2CO3(s) + H20(1) + CO2(g) e. CH4(g) + 2 02(g) → CO2(g) + 2H2O(1)

Consider the following reaction,  Ba (s) +Cu2+ (aq) → Cu(s) + Ba2+ (aq)   Which reactant is reduced?  __________________________________ Which reactant is the reducing agent?  __________________________________

46. ** Questions # 43 through # 48 use the half reaction method to balance the following skeletal reaction in an acid. Fe (s) + NO3- (aq) → Fe3+ (aq) + N2 (g) For the half reaction with nitrate, how many hydrogen ions are in the balanced half reaction, and on which side of the reaction? Select one: a. 3 on the reactant side b. none of these c. 12 on the reactant side d. 12 on the product side e. 6 on the reactant side f. 3 on the product side g. 1 on the reactant side h. 6 on the product side i. 1 on the product side

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For the redox reaction: What is being oxidized? What is being reduced? (i.e. which one is losing electrons and which is gaining electrons) Cs (s) + NaI(aq) --> CsI (aq) + Na (g)