1. Conservation of Mass

2. Matter cannot be created or destroyed.
Law of Conservation
Matter cannot be created or destroyed.

3. How does this apply to normal systems?
In any type of reaction, you must end up with the same amount of matter you start off with.
This applies even though the reactants and products are different.

10. What’s the problem with this equation?
H2 + O2 -> H2O
It breaks the Law of Conservation of Mass.
Why?

11. H2 + O2 -> H2O

13. Balancing Chemical Equations
We must balance chemical equations to ensure they do not break the Law of Conservation of Mass.