Redox

Topics: Redox, Oxidizing agent, Hydrogen Pages: 2 (591 words) Published: September 10, 2013
Redox Problem Set 1: Reactions and Stoichiometry
(All of these questions are no calculator friendly) 1) Give the oxidation number of carbon in each of the following: a) b) c) d) CF2Cl2 Na2C2O4 HCO3-1 C2H6

2) Give the oxidation number of sulphur in each of the following: a) b) c) d) SOCl2 H2S2 H2SO3 Na2S

3) Identify the oxidizing and reducing agents in each of the following: a) b) c) d) 8H+(aq) + 6Cl-1(aq) + Sn(s) + 4NO3-1(aq) SnCl6 -2(aq) + 4NO2(g) + 4H2O(l) 2MnO4-1(aq) + 10Cl-1(aq) + 16H+(aq) 5Cl2(g) + 2Mn+2(aq) + 8H2O(l) + -2 -2 8H (aq) + Cr2O7 (aq) + 3SO3 (aq) 2Cr+3(aq) + 3SO4-2(aq) + 4H2O(l) NO3-1(aq) + 4Zn(s) + 7OH-1(aq) + 6H2O(l) 4Zn(OH)4-2(aq) + NH3(aq)

4) Balance the following oxidation-reduction equations. All reactions occur in acidic solutions. a) b) c) d) Zn + NO3-1 ReO2 + Cl2 HNO2 + MnO4-1 Cu + NO3-1 Zn2+ + NH4+ HReO4 + Cl-1 NO3-1 + Mn2+ 2+ Cu + NO

5) Balance the following oxidation-reduction equations. All reactions occur in basic solutions. a) b) c) d) S2O3-2 + OCl-1 SO4-2 + Cl-1 NiO2 + Fe Ni(OH)2 + Fe(OH)3 SbH3 + H2O Sb(OH)4-1 + H2 P4 PH3 + HPO3-2

6) Balance the folowing oxidation-reduction equations under the specific conditions noted: a) Pb + PbO2 + SO4-2 PbSO4 (acidic solution) -2 b) CrI3 + Cl2 CrO4 + IO4-1 + Cl-1 (basic solution) c) XO2+ + YO+ X2O4-3 + Y-1 + Y3O7-2 (basic solution) 7) Given the following unbalanced oxidation-reduction reaction that occurs in basic solution: S2O3-2(aq) + H2O2(aq) a) b) c) d) S3O6-2(aq) + SO4-2(aq) + H2O(l)

Balance the reaction. Which substance is the oxidizing agent? What is the equivalent weight of H2O2 (Molar mass = 34.0 grams) in the above reaction? What is the normality of a 0.040 M H2O2 solution used in the above reaction?

8) Iodine reacts with thiosulphate ion (S2O3-2) in acidic solution to form iodide and tetrathionate ion (S4O6-2). Calculate the volume in mL of 0.100 M Na2S2O3 needed to react with 0.2538 g of I2. (Answer = 20.00 mL)

9) Thyroxine (C15H11I4NO4) is a hormone...
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