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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