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Balancing Chemical Equations Worksheet
Steps to Balancing a Chemical Equation
1. Write all reactants on the left and all products on the right side of the equation
arrow. Make sure you write the correct formula for each element.
2. Use coefficients in front of each formula to balance the number of atoms on each
side.
3. Multiply the coefficient of each element by the subscript of the element to count
the atoms. Then list the number of atoms of each element on each side.
4. It is often easiest to start balancing with an element that appears only once on
each side of the arrow. These elements must have the same coefficient. Next
balance elements that appear only once on each side but have different numbers
of atoms. Finally balance elements that are in two formulas in the same side
Try: Balance the following equations:
Pb(NO3)2 
KNO3 +
PbI2
b) NaOH +
H2SO4 
Na2SO4 +
H2O
c) BaCl2
K2SO4  BaSO4 + KCl
a) KI +
+
d) H2SO4 + KOH K2SO4 + H2O
e) Zn + HCl ZnCl2 + H2
f) KClO3 KCl + O2
g) S8 + F2 SF6
h) Fe + O2  Fe2O3
i) C2H6 + O2  CO2 + H2
1
Chemistry 30 review
Moles and Balancing Chemical Equations
1. Balance this Equation: (3 points)
__ C5H12 + __ + O2  __ CO2 + __ H2O
2. Calculate the following:
a. What is the molecular weight for K2HPO4? (2 points)
b. How many moles of NaCl do you have if you weighed out 35.8
grams? (3 points)
c. If you have 3.5 moles of Al2O3, how many molecules of Al2O3
do you have? (2 points)
2