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Balancing Equations

Balancing Equations. Law of Conservation of Mass. The Law of Conservation of Mass states: that mass is neither created nor destroyed in any chemical reaction . Therefore balancing equations requires the same number of atoms on both sides of a chemical reaction.

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Balancing Equations

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  1. Balancing Equations

  2. Law of Conservation of Mass The Law of Conservation of Mass states: that mass is neither created nor destroyed in any chemical reaction. Therefore balancing equations requires the same number of atoms on both sides of a chemical reaction. The number of atoms in the Reactants must equal the Number of atoms in the Products

  3. Balance elements in the following order: Nonmetals Metals Polyatomic ions Hydrogen Oxygen

  4. Polyatomic Ions When balancing polyatomic ions treat them as one unit if they appear on both sides of the equation.

  5. Balancing Equations N2 + H2 NH3 __N__ __H__ • 2 1 • 2 3 • Complete an atom inventory.

  6. Balancing Equations • Nothing is balanced. • Balance the nitrogen first by placing a coefficient of 2 in front of the NH3. N2 + H22NH3

  7. Balancing Equations • Hydrogen is not balanced. • Place a 3 in front of H2. • Complete a final atom inventory. N2 + 3H22NH3 • 2 2 • 6 6 __N__ __H__

  8. Balancing Equations C3H8 + O2→ CO2+ H2O __C__ __H__ __O__ • 3 1 • 8 2 • 2 3 • Complete an atom inventory.

  9. Balancing Equations • Nothing is balanced. • Balance the carbon first by placing a coefficient of 3 in front of the CO2. C3H8 + O2 → 3CO2+ H2O

  10. Balancing Equations • Now balance the hydrogen by placing a 4 in front of the water on the products side. C3H8 + O2 → 3CO2+ 4H2O

  11. Balancing Equations • Balance the oxygen on the reactants side with a coefficient of 5. C3H8 + 5O2 → 3CO2+ 4H2O • Complete a final atom inventory. __C__ __H__ __O__ • 3 3 • 8 8 • 10 10

  12. Balancing Equations BF3+ Li2SO3→ B2(SO3)3+ LiF • 12 • 31 • 21 • 1 3 __B__ __F__ __Li__ __SO3__ • Complete an atom inventory.

  13. Balancing Equations • Nothing is balanced. • Balance the fluorine first by placing a coefficient of 3 in front of the LiF. BF3+ Li2SO3→ B2(SO3)3+ 3LiF

  14. Balancing Equations • Now balance the boron by placing a 2 in front of the BF3on the reactants side. 2BF3+ Li2SO3→ B2(SO3)3+ 3LiF • Notice we’ve unbalanced the fluorine, and now must adjust our coefficients.

  15. Balancing Equations • Now balance the boron by placing a 2 in front of the BF3on the reactants side. 2BF3+ Li2SO3→ B2(SO3)3+ 6LiF • Notice we’ve unbalanced the fluorine, and now must adjust our coefficients.

  16. Balancing Equations • Balance the lithium sulfite on the reactants side with a coefficient of 3. 2BF3+ 3Li2SO3→ B2(SO3)3+ 6LiF • Complete a final atom inventory. __B__ __F__ __Li__ __SO3__ • 22 • 66 • 66 • 3 3

  17. YOU ARE BALANCED!!

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