Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Identify the oxidation and reduction steps in the following reaction:4Fe +3O2 → 2Fe2O3A.  Oxidize: O2 → 2 O2− + 2 e−                  Reduced: Fe → Fe  3+ + 3 e−B.  Oxidize: Fe → Fe2+ + 2 e−                    Reduced: O2 → 2 O2− + 4 e−C.  Oxidize: Fe → Fe3+ + 3 e−                    Reduced: 4 e− + O2 → 2 O2− D.  Oxidize: Fe → Fe3+ + 3 e−                      Reduced: O2 → 2 O2− + 4 e−E.  Oxidize: O2 → 2 O2− + 4 e−                  Reduced: Fe → Fe3+ + 3 e− 

Problem

Identify the oxidation and reduction steps in the following reaction:

4Fe +3O2 → 2Fe2O3

A.  Oxidize: O2 → 2 O2 + 2 e                  Reduced: Fe → Fe  3+ + 3 e

B.  Oxidize: Fe → Fe2+ + 2 e                    Reduced: O2 → 2 O2 + 4 e

C.  Oxidize: Fe → Fe3+ + 3 e                    Reduced: 4 e + O2 → 2 O2 

D.  Oxidize: Fe → Fe3+ + 3 e−                      Reduced: O2 → 2 O2− + 4 e

E.  Oxidize: O2 → 2 O2 + 4 e                  Reduced: Fe → Fe3+ + 3 e