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