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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)

Calculating Oxidation Numbers is the first pivotal step in understanding redox reactions. 

Calculate Oxidation Numbers

Concept #1: Oxidation Number

Elements in Natural State have an oxidation number of zero: H2, N2, O2, F2, P4, S8, Cl2, Se8, Br2.

Example #1: Which of the following compounds would have an oxidation number or oxidation state equal to zero?

Concept #2: Ions

Example #2: Which of the following elements would have the most positive oxidation number based on its ionic form?

Practice: Which of the following elements would have the lowest oxidation number?

Concept #3: Oxidation Number Rules

Example #3: Which compound has oxygen with the lowest oxidation state?

Concept #4: Oxidation Number of Non-listed Elements

Example #4: Give the oxidation number of the carbon atom in the acetate ion: C2H3O2

Oxidation number of monoatomic ions equals to their charge.

Specific rules exist for calculating oxidation numbers of group 1A and 2A elements, F, H, O and Halogens.