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Transcript
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.
_____________________________________________________________
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