1. And the Law of Conservation of Mass

2. Water H H H H H H H H O O O O H H H H H H H H O O O O

3. Ammonia H H H H H H H H N N N N H H H H

4. Silver Tarnishing Ag S S

5. Iron Oxide (a.k.a. Rust) F F F F F F F F O O O O O O O O O O O O

6. Law of Conservation of Mass The Law of Conservation of Mass states that in a chemical reaction there is no loss of matter. Each type of element will have the SAME amount before the reaction and after the reaction. Since you can’t change the amount of materials that make up the reactants, you must write a number in front of each of the products to make sure every type of atom has the same amount before and after!

7. Potassium Chloride K K O O H H H H Cl

8. Antacid settling stomach acid Ca O O H H H H Cl H H O O H H

9. Copper and Iron (II) Sulfate Fe O O S S Cu O O O O O O

10. Combustion Reactions

11. Photosynthesis

12. Cellular Respiration