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Chapter 8: Lesson 2
Chemical Equations
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Learning Objectives
Today’s
Objective:
 SWBAT: Distinguish
among elements,
compounds, and molecules.
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Elements, Compounds, and
Molecules
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Elements
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Consist of only 1 type
of element
•
Symbols for the
elements are found on
the periodic table
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Diatomic Molecules
•
Neutral particles in which
elements share electrons

Diatomic = “two” atoms
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These molecules have two
atoms of the same
element.
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Remember: HNOFClBrI
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H2, N2, O2, F2, Cl2, Br2, I2
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Compounds

Compounds are
composed of 2 or more
different atoms.

H2O: water is a covalent
compound
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NaCl: salt is an ionic
compound {Formula
Unit}
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Learning Objective - Preview

Determine how a chemical reaction satisfies
the law of conservation of mass.
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Law of Conservation of Mass
 Mass
Before = Mass After
 Mass
of reactants = Mass of Products
 Figure
9 page 346
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Word Equations:
 Tin
+ Oxygen Gas  Tin Oxide
 Reactants:
  “produces”
 Product:
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Word Equations:
 Tin
+ Oxygen Gas  Tin Oxide
 Reactants: tin, and
  “produces”
 Product: tin
oxide
oxygen gas
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
How many Reactants are there?
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
How many Products are there?
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Acetic acid
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Carbon dioxide
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Water
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Sodium bicarbonate
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Word Equations:
Random Selection… be ready!
 Sodium
bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Sodium acetate
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Word Equations:
Are they good enough?

Tin + Oxygen Gas  Tin Oxide

Quick Write:

Does this equation prove the Law of Conservation of Mass?
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Why or Why Not?
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Chemical Reactions:
Whiteboards

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Chemical Reactions:
Whiteboards
C
+ O2  CO2
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Chemical Reactions:
Whiteboards
H2O2
 H2O + O2
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Chemical Reactions:
Whiteboards
CH4
+ 2O2  CO2 + 2H2O
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Chemical Reactions:
Whiteboards
C
+ O2  CO2