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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:

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The Law of Mass Conservation

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  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

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