Name: _______________________________ Define the law of conservation of mass: ________________________________________________________________________________ ________________________________________________________________________________ Experiment 1: Alka-Seltzer Tablet and Water Bottle 1. Is this a closed system or an open system? _____________________________ 2. Mass of Alka-Seltzer tablet and water bottle with water before the reaction: ________________________________________________________________ 3. Mass of Alka-Seltzer tablet and water bottle with water after the reaction: ________________________________________________________________ 4. Difference between mass before and after the reaction: (Hint: subtract mass after reaction from mass before reaction) __________________________________________________________________________ 5. Reactants in experiment: _______________________________________________ 6. Products in experiment: ________________________________________________ 7. Experiment Observations (How do you know a chemical reaction took place?): __________________________________________________________________________ _________________________________________________________________________ 8. Why do you think that the after mass is lower than the before mass? __________________________________________________________________________ __________________________________________________________________________ Name: _______________________________ Experiment 2: Alka-Seltzer Tablet, Water Bottle, and Balloon 1. Is this a closed system or an open system? ___________________________ 2. Mass of Alka-Seltzer tablet, water bottle with water, and balloon before the reaction: ___________________________________________________ 3. Mass of Alka-Seltzer tablet, water bottle with water, and balloon after the reaction: __________________________________________________________ 4. Difference between mass before and after the reaction: (Hint: subtract mass after reaction from mass before reaction) ________________________________________________________________________ 5. Reactants in experiment: ______________________________________________ 6. Products in experiment: _______________________________________________ 7. Experiment Observations (How do you know a chemical reaction took place?): __________________________________________________________________________ __________________________________________________________________________ 8. Why do you think that the before and after masses are the same now? __________________________________________________________________________ __________________________________________________________________________ 9. How does this lab reflect the law of conservation of mass? __________________________________________________________________________ _________________________________________________________________________
