1. + Chapter 8: Lesson 2 Chemical Equations

2. + Learning Objectives Today’s Objective: SWBAT: Distinguish among elements, compounds, and molecules.

3. + Elements, Compounds, and Molecules

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

5. + Diatomic Molecules Neutral particles in which elements share electrons Diatomic = “two” atoms These molecules have two atoms of the same element. Remember: HNOFClBrI H 2, N 2, O 2, F 2, Cl 2, Br 2, I 2

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

7. + Learning Objective - Preview Determine how a chemical reaction satisfies the law of conservation of mass.

8. + Law of Conservation of Mass Mass Before = Mass After Mass of reactants = Mass of Products Figure 9 page 346

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

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

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

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

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

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

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

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

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

18. + 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?

19. + Chemical Reactions: Whiteboards 

20. + C + O 2  CO 2

21. + Chemical Reactions: Whiteboards H 2 O 2  H 2 O + O 2

22. + Chemical Reactions: Whiteboards CH 4 + 2O 2  CO 2 + 2H 2 O

23. + Chemical Reactions: Whiteboards C + O 2  CO 2