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
Solubility Rules
Molecular Equations
Gas Evolution Equations
Solution Stoichiometry
Complete Ionic Equations
Calculate Oxidation Numbers
Redox Reactions
Balancing Redox Reactions: Acidic Solutions
Balancing Redox Reactions: Basic Solutions
Activity Series
Additional Practice
Types of Chemical Reactions
Normality & Equivalent Weight
Additional Guides
Oxidation Reduction (Redox) Reactions
Oxidation Number
Net Ionic Equation

Redox Reactions (oxidation-reduction reactions) involve transference of an electron(s) between reactants.

Oxidation-Reduction Reactions

Concept #1: Redox Reactions

To remember the difference between oxidation and reduction just learn: LEO the lion goes GER

Concept #2: Redox Reactions

Example #1: Which reactant is undergoing oxidation and which reactant is undergoing reduction?

Practice: Which element is being reduced in the following reaction? 

Cr2O72- + 3 HNO2 + 5 H→ 2 Cr3+ +  3NO3- + 4 H2O

Practice: Identify the oxidizing agent and reducing agent from the following redox reaction. 

Ba (s) + Cl2 (g) → BaCl2 (aq)

Practice: Which element is oxidized and which is reduced in the following reaction?

Hg (aq) + HgCl2 (aq) → Hg2Cl2

Practice: Which of the following represents an oxidation-reduction reaction? 

I. PCl3 (aq) + Cl2 (g) → PCl5 (aq) 

II. 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s) 

III. CO2 (g) + 2 LiOH (aq) → 2 Li2CO3 (aq) + H2O (l)

IV. FeCl2 (aq) + 2 NaOH (aq) → Fe(OH)2 (aq) + 2 NaCl (aq)