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Balancing Chemical Equations Name: ______________________________________ Date: ___________ Pre Lab Questions: Answer the following before you begin the activity: 1. What number represents the Coefficient? ______________ 5H2 2. What number represents the Subscript? _______________ 3. What element is represented by the letter "H"? __________ 4. How many "H's" do you have? _______________________ Procedure : 1. Using your set of cards, replicate the chemical equation onto your desk. Record the following results into Table 1: 2. Identify the elements on the reactant side. 3. Count the number of atoms for each element. 4. Identify the elements on the product side. 5. Count the number of atoms on the product side. 6. Are the 2 sides equal? If not, the equation is not balanced. 7. The index cards numbered 2 - 7 are your coefficients. They can ONLY be placed in front of the elements. You can not change the subscripts. 8. Choose an element that is not balanced and begin to balance the equations. 9. Continue until you have worked through all the elements. 10. Once they appear balanced, count the final number of Reactants and Products to make sure that they are equal. 11. Write the balanced equation. Al2O3 Al + O2 C2H4 + O2 CO2 + H2O Na2SO4 + CaCl2 CaSO4 + NaCl C + H2 CH4 Fe + H2O Fe3O4 + H2 P4 + O2 P4O10 N2 + H2 NH3 Na + O2 Na2O H2O2 H2O + O2 H2 + O2 H2O desk Make the following Equations on your Reactants Products Balanced Equation Data: Analysis/Results: 1. What does "" mean in a chemical equation? _____________________________________________________________ _____________________________________________________________ 2. What side of the equation are the reactants found? ____________ And the products? _____________ 3. Why must all chemical equations be balanced? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 4. Why can't the subscripts be changed? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ Conclusion: Write 2-3 sentences on what you learned. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________