Raccoon

Neil
Ms. Parkhurst
Chemistry
10/3/2012
Law of Conservation of Mass Inquiry Lab
Background
In the 19th century, Antoine Lavoisier discovered the Law of Conservation of Mass, the Law of Conservation of Mass states that mass is neither created nor destroyed during ordinary chemical reactions or physical changes. A Closed System can not exchange any of heat, work, or matter with the surrounding. An Open System can exchange all of heat, work, or matter. It allows interactions between its internal elements and the environment.

Purpose The purpose of this lab was to designed and complete a laboratory experiment that proves the law of conservation of mass.

Procedure First of all, a flask was taking out and filled in with 15ml of water. The mass of the flask & water was determined and recorded. Then, an Alka Seltzer tablet was filled in the water. After a while, placed the flask & water & Alka Seltzer tablet on to the balance pan, the mass of the whole system was determined. This procedure was for the open system. For the close system, a flask was taking out and filled in with 15ml of water. The mass of the flask & water was determined and recorded. Then, an Alka Seltzer tablet was placed in a balloon, and put the balloon on the top of the flask, the Alka Seltzer tablet fell into the water. After the reaction was done, measured the mass of it, recorded it into the data table.

IV. Data Table
Data of Law of Conservation of Mass
| |Mass |
|Open system before |126.53g |
|Open system after |126.09g |
|Closed system before |143.65g |
|Closed system after |145.21g |

Conclusion and Analysis The mass of the open