1. H2OH2O Review: How to make a molecule… No Subscript, There is only 1 atom of oxygen in the molecule Subscript Visual modelFormula

2. H2OH2O Review: How to make a molecule… No Subscript, There is only 1 atom of oxygen in the molecule Subscript Visual modelFormula H2O2H2O2

3. 6 H 2 O Review: How to make a molecule… Visual modelFormula Coefficient- How many molecules you have.

4. H2OH2O 1 molecule of H 2 O

5. 3 H 2 O 3 molecules of H 2 O

6. Let’s now model another chemical equation with our M&M’s… Reactantsproducts Chemical equation C + O 2  CO 2 Visual model +  Word equation To yield Number of atoms  1 atom carbon react with 1 molecule oxygen 1 molecule CO 2 1 carbon 2 oxygen

7. Is it a balanced equation? How do we know? Reactantsproducts Chemical equation C + O 2  CO 2 Visual model +  Word equation  Number of atoms 1 atom carbon + 1 molecule oxygen 1 molecule CO 2 1 carbon 2 oxygen

8. Law of Conservation of Mass Matter is not created or destroyed, it just changes forms. In a chemical reaction…

9. Evidence of a chemical reaction: (chemical change) Production of a gas (bubbling, fizzing or foaming) A change in temperature or light (an energy change) Appearance of a precipitate (solid material)precipitate A change in color

10. More practice… Reactantsproducts Chemical equation 2C + 2O 2  3CO 2 Visual model +  Word equation To yield Number of atoms 2 atoms carbon react with 2 molecule oxygen 3 molecules CO 2 Is it balanced? 2 carbons 4 oxygen3 carbons 6 oxygens

11. With a partner… Instructions: 1.Create visual models for the rest of the chemical equations. 2.Draw an label the visual models. 3. For each equation complete the following stem: The equation is/is not balanced because… Chlorine Sodium Oxygen Hydrogen Carbon Color Key

13. The model above is best represented by: a.H 2 O b.2OH c.HOOH d.H 2 O 2

14. The above model shows: a.10 atoms b.2 molecules c.2CH 3 Cl d.All of the above

21. 6CO 2 + 6H 2 0+ Sun’s light  C 6 H 12 O 6 +6O 2 The above reaction… a.is photosynthesis b.Is respiration c.Transforms radiant energy into chemical energy d.Both a and c.

22. Organic Molecules all contain… a.Sulfur b.Carbon c.Oxygen d.nitrogen Correct!

23. All of the following are organic molecules except… a.C 6 H 12 O 6 b.CH 4 c.C 6 H 6 O d.H 2 0

27. Evidence of a chemical reaction: (chemical change) Production of a gas (bubbling, fizzing or foaming) A change in temperature or light (an energy change) Appearance of a precipitate (solid material)precipitate A change in color A change in odor

28. A chemical equation tells the story of a chemical reaction. Our combustion reaction again… Reactantsproducts Physical properties White crystal To yield Black crystal/powder Gas produced Chemical equation C 12 H 22 O 11 + 12 O 2  12 CO 2 + 11 H 2 O Visual model +  + Number of atoms 12 atoms carbon+ 22 atoms hydrogen+ 35 oxygen atoms 

29. Chemical Reaction Dehydration of sugar… Reactantsproducts Physical properties White crystal To yield Black crystal/powder and white gas Chemical equation C 12 H 22 O 11  12 C + 11 H 2 O (vapor) Visual model  + Number of atoms 12 carbons 22 Hydrogen 11 oxygen  12 carbons 22 hydrogens 11 oxygens