2. EQUATIONS 2H 2 + O 2 2H 2 O Arrow points toward products Subscripts tell how many of each element they are by Elements from each side must be equal, i.e. 4H’s on each side, 2O’s on each side

3. NAMED PARTS OF EQUATION 2Na + S Na 2 S Reactants (Na + S) Products(NaS) Subscripts (Na 2 ) Coefficients (3Na) Yields ( )

4. HINTS Start with the second (or last) element in a compound Remember to multiply coefficients and subscripts Check all work

5. COUNTING ELEMENTS PbI 2 MnO 2 Yb 2 (SO 4 ) 3 3Ca(H 2 C 3 O 2 ) 2 BeO

6. PRACTICE BALANCING H 2 + O 2 H 2 O Be + O 2 BeO Al + O 2 Al 2 O 3 Ca + Cl 2 CaCl 2 K + Cl 2 KCl H 2 + N 2 NH 3

7. ANSWERS 2H 2 + O 2 2H 2 O 2Be + O 2 2BeO 4Al + 3O 2 2Al 2 O 3 Done 2K + Cl 2 2KCl 3H 2 + N 2 2 NH 3