1. Balancing Chemical Equations

2. Balancing Equations Identify the REACTANTS & PRODUCTS
(You may want to write a word equation )

3. Balancing Equations
Using correct formulas and symbols, write an unbalanced equation for the reaction.
{A SKELETON EQUATION}

4. Balancing Equations
Balance atoms ONE element at a time by inserting coefficients.
START with elements that appear in only one reactant and
one product, and balance the atoms of those elements first.

5. Balancing Equations
IF a polyatomic ion appears on both sides of the equation, treat it as a single unit.

6. Leave Oxygen and Hydrogen for the last elements to balance.
Balancing Equations
Leave Oxygen and Hydrogen for the last elements to balance.
Double-check to be sure that the number of atoms of each element is the same on both sides of the equation

7. Balancing Equations PRACTICE PROBLEMS
1. When propane (C3H8) burns completely in air(O2), the reaction forms carbon dioxide and water vapor. Write and balance the equation for this reaction.

8. When propane (C3H8) burns completely in air(O2), the reaction forms carbon dioxide and water vapor..
Step 1 the Skeleton Equation C3H8 +O2  CO2 + H2O Step 2 Count and Compare elements (3 – C) 3(1 – C) (8 – H) 4(2 –H) (2 – O) x 5 (3 – O)

9. Step 3 Use Coeffeicients to Balance
C3H8 + 5 O2  3 CO2 + 4 H2O

10. Balancing Equations PRACTICE PROBLEMS online
Balance the following skeleton chemical equations:
a. KI(aq) + Cl2(g) → KCl(aq) + I2(s)
b. Al(s) + H2SO4(aq) → Al2(SO4)3(aq) H2(g)
c. Online problem check