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Balancing Equations

Mark Britt Chemistry Honors Thursday, May 30th. Balancing Equations. Define the Balancing of Equations:.

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Balancing Equations

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  1. Mark Britt Chemistry Honors Thursday, May 30th Balancing Equations

  2. Define the Balancing of Equations: • An equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction. 

  3. Ex. 1 C5H12 + O2 ---> CO2 + H2O

  4. Answer to Ex. 1 • There are five carbons on the left but only one on the right. Put a 5 in front of the CO2 on the right hand side.C5H12 + O2 ---> 5CO2 + H2OThere are twelve hydrogen's on the left but only two on the right hand side. Put a 6 in front of the H2O on the right hand side.C5H12 + O2 ---> 5CO2 + 6H2OFinally, there are only two oxygen's on the left hand side but 16 of them on the right hand side. So put a 8 in front of the O2 on the left hand side.C5H12 + 8O2 ---> 5CO2 + 6H2OIt's now a balanced chemical equation.

  5. Ex. 2 • Zn + HCl ---> ZnCl2 + H2

  6. Answer to Ex. 2 • There are two chlorines on the right but only one on the left. Put a 2 in front of the HCl on the left hand side.Zn + 2HCl ---> ZnCl2 + H2The equation is now balanced, with one Zn on each side, two hydrogen's on each side and two chlorines on each side.

  7. Practice Problem #1 • S8 + F2 ---> SF6

  8. Practice Problem #2 • FeCl3 + NH4OH ---> Fe(OH)3 + NH4Cl

  9. Practice Problem #3 • Ca(OH)2 + H3PO4 ---> Ca3(PO4)2 + H2O

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