1. Trends in groups and rows; Balanced and unbalanced equations
Periodic Table
Trends in groups and rows; Balanced and unbalanced equations

2. Unpack Equation and Determine if Balanced
Subscripts = number of atoms in the molecule Coefficients = number of molecules Is the mass balanced? H2 + O2 -> H2O

3. Unpack Equation and Determine if Balanced
Subscripts = number of atoms in the molecule
Coefficients = number of molecules
Is the mass balanced?
H2 + O2 -> H2O
2 Hydrogens + 2 Oxygens ?=? 2 Hydrogens + 1 Oxygen
Not balanced

4. Unpack Equation and Determine if Balanced
H2O2 -> H2O + O2

5. Unpack Equation and Determine if Balanced
H2O2 -> H2O + O2
2 H + 2 O ?=? 2 H + 1 O + 2 O
Combine like atoms on each side of the equation
2 H + 2 O ?=? 2 H +3 O
Not balanced

6. Unpack Equation and Determine if Balanced
Na + O2 -> Na2O

7. Unpack Equation and Determine if Balanced
Na + O2 -> Na2O 1 Sodium + 2 Oxygens ?=? 2 Sodiums + 1 Oxygen Not balanced

8. Unpack Equation and Determine if Balanced
N2 + H2 -> NH3

9. Unpack Equation and Determine if Balanced
N2 + H2 -> NH3
2 Nitrogen + 2 Hydrogens ?=? 1 Nitrogen + 3 Hydrogens
Not balanced

10. Unpack Equation and Determine if Balanced
P4 + O2 -> P4O6

11. Unpack Equation and Determine if Balanced
P4 + O2 -> P4O6
2 Phosphorus’ + 2 Oxygens ?=? 4 Phosphorus’ + 6 Oxygens
Not balanced

12. Unpack Equation and Determine if Balanced
C + H2 -> CH4

13. Unpack Equation and Determine if Balanced
Al2 O3 -> Al + O2

14. Unpack Equation and Determine if Balanced
Fe + H2O -> Fe3O4 + H2

15. Unpack Equation and Determine if Balanced
C2H6 + O2 -> CO2+ H2O

16. Unpack Equation and Determine if Balanced
Na2SO4 + CaCl2 -> CaSO4 + NaCl