CHEM 111 Chapter 3 Notes

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CHEM 111 Chapter 3 Notes

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CHEM 111 Chapter 3 Notes

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Chapter 3
Equations, the Mole, and
Chemical Formulas

136

, 3.1 Chemical Equations
§ Objectives:
• Write balanced equations for chemical
reactions
• Identify acids and bases
• Identify and balance chemical equations
for neutralization reactions, combustion
reactions, and oxidation-reduction
reactions
• Assign oxidation numbers

137

, Chemical Equations
§A chemical equation is a shorthand
notation to describe a chemical
reaction.
Magnesium and oxygen react to form
magnesium oxide

®
2
___Mg + ___O2 ® ___MgO
2
subscript cannot
↑
138
be changed

, Definitions
§ Reactants are the substances
consumed.
§ Products are the substances formed.
§ Coefficients are numbers before the
formula of a substance in an equation.
§ A balanced equation has the same
number of atoms of each element on
both sides of the equation.
139

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Uploaded on: May 14, 2026
Number of pages: 64
Written in: 2024/2025
Type: Class notes
Professor(s): Alison luscomb
Contains: All classes

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