1. Law of Conservation of Mass

2. Law of Conservation of Mass: When matter undergoes a chemical or physical change, mass is neither created or destroyed!

4. For example: when wood burns… where does the mass go?

5. The CARBON combines with the OXYGEN and turns into CARBON DIOXIDE!

7. Law of Conservation of Matter
In a chemical reaction, matter is not created or destroyed, but the atoms may rearrange themselves into new molecules.
Scientists can balance equations be adding coefficients to the formulas to help make sense of the amount of atoms.

8. For example, where would we add a number to make the equation BALANCED
For example, where would we add a number to make the equation BALANCED? 6C + O2  6CO2

9. Balancing Chemical Equations

10. Photosynthesis

11. __CO2 + __H2O  __C6H12O6 + __O2
Photosynthesis

12. 6CO H2O  C6H12O O2
Photosynthesis

13. Law of Conservation of Mass: Balancing Equations
Carbon – Brown
Oxygen – Red
Hydrogen - Blue
Modeling Activity

14. H2 + N2  NH3
ISN pg 41

16. Balance the following equations!

17. Zn + HCl  ZnCl2 + H2 (not balanced…)
More Practice…
Zn + HCl  ZnCl2 + H (not balanced…)
C3H8 + O2  CO2 + H2O (not balanced…)