1 / 6

The Law of Mass Conservation

The Law of Mass Conservation. Conservation of Mass. Mass (Matter) is not created or destroyed during a chemical reaction (in other words, the beginning and ending mass must be the same) Open –v- closed system:

raya-chaney
Download Presentation

The Law of Mass Conservation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Law of Mass Conservation

  2. Conservation of Mass • Mass (Matter) is not created or destroyed during a chemical reaction (in other words, the beginning and ending mass must be the same) • Open –v- closed system: • In an open system, matter may escape into the environment, but mass is still conserved!! • Ex/ a fireplace – gas escapes • In a closed system, matter can not escape into the environment • Ex/ a sealed container

  3. Balancing Equations • To show mass conservation in equations, the # of each type of atom that enters a reaction must be the same as the # of that atom that is produced • This is called having a balanced equation • The coefficient tells you how many of each element or molecule is involved in the reaction • Multiply by the subscript to get the total • Ex/ 4 O2 = 8 O atoms • Ex/ 2 H = 2 hydrogen atoms

  4. Example: CH4 + O2 CO2 + H2O ReactantsProducts C= 1 C= 1 H= 4 H= 2 O= 2 O= 3 NOT balanced!

  5. Example: CH4 + 2 O2 CO2 + 2 H2O ReactantsProducts C= 1 C= 1 H= 4 H= 4 O= 4 O= 4 Balanced!

  6. Practice P4O10+ H2O  H3PO4 2 H2O  2 H2 + O2 SiCl4  Si + Cl2

More Related