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Ch.5 Classification & Balancing of Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 Matter and Measurements
Ch.2 Atoms and the Periodic Table
Ch.3 Ionic Compounds
Ch.4 Molecular Compounds
Ch.5 Classification & Balancing of Chemical Reactions
Ch.6 Chemical Reactions & Quantities
Ch.7 Energy, Rate and Equilibrium
Ch.8 Gases, Liquids and Solids
Ch.9 Solutions
Ch.10 Acids and Bases
Ch.11 Nuclear Chemistry
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Chemical Reaction: Chemical Change
Law of Conservation of Mass
Balancing Chemical Equations (Simplified)
Solubility Rules
Molecular Equations
Types of Chemical Reactions
Complete Ionic Equations
Calculate Oxidation Numbers
Redox Reactions
Spontaneous Redox Reactions
Balancing Redox Reactions: Acidic Solutions
Balancing Redox Reactions: Basic Solutions
Balancing Redox Reactions (Simplified)
Galvanic Cell (Simplified)

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

Oxidizing Agent is reduced and in turn oxidizes another element/compound.

Reducing Agent is oxidized and in turn reduces another element/compound.

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) → Li2CO3 (aq) + H2O (l)

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