Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
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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

Calculate Oxidation Number

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Sections
Molarity
Normality & Equivalent Weight
Solution Stoichiometry
Solubility Rules
Net Ionic Equations
Electrolytes
Redox Reaction
Balancing Redox Reactions
Activity Series
End of Chapter 4 Problems
Additional Practice
Redox Reactions
Calculate Oxidation Number
Additional Guides
Dilution
Net Ionic Equation
Oxidation Reduction (Redox) Reactions
Oxidation Number
Types of Chemical Reactions
GuideAdditional PracticeSummary
Problem

What is the oxidation number of the chromium atom in Na2CrO4 ?

A) +7 

B) +6 

C) -2 

D) +2


Solution

We’re being asked to determine the oxidation state of Cr in Na2CrO4


The rules for oxidation states are as follows:

A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge


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