1. Chapter 8: Lesson 2
Chemical Equations

2. Elements, Compounds, and Molecules

3. Elements Consist of only 1 type of element
Symbols for the elements are found on the periodic table

4. 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

5. Compounds Compounds are composed of 2 or more different atoms.
H2O: water is a covalent compound
NaCl: salt is an ionic compound {Formula Unit}

6. Law of Conservation of Mass
Mass Before = Mass After
Mass of reactants = Mass of Products

7. Word Equations: Tin + Oxygen Gas  Tin Oxide Reactants:  “produces”
Product:

8. Word Equations: Tin + Oxygen Gas  Tin Oxide
Reactants: tin, and oxygen gas
 “produces”
Product: tin oxide

9. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
How many Reactants are there?

10. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
How many Products are there?

11. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Acetic acid

12. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Carbon dioxide

13. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Water

14. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Sodium bicarbonate

15. Word Equations: Random Selection… be ready!
Sodium bicarbonate + acetic acid 
water + carbon dioxide + sodium acetate
Product or Reactant?
Sodium acetate

16. Stop Here!

17. 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?

18. Chemical Reactions: Whiteboards
What does this symbol mean?

19. Chemical Reactions: Whiteboards
C + O2  CO2
Write down the reactants…

20. Chemical Reactions: Whiteboards
H2O2  H2O + O2
Write down the products

21. Chemical Reactions: Whiteboards
CH4 + 2O2  CO2 + 2H2O
Write down the products

22. Chemical Reactions: Whiteboards
C + O2  CO2
Write down the reactants