Presentation on theme: "IIIIIIIVV II. Balancing Equations (p. 285-288) Ch. 9 – Chemical Reactions."— Presentation transcript:
IIIIIIIVV II. Balancing Equations (p ) Ch. 9 – Chemical Reactions
A. Balancing Steps 1.Write the unbalanced equation. 2.Count atoms on each side. 3.Add coefficients to make #s equal. Coefficient subscript = # of atoms 4.Reduce coefficients to lowest possible ratio, if necessary. 5.Double check atom balance!!!
B. Helpful Tips n Balance one element at a time. n Update ALL atom counts after adding a coefficient. n If an element appears more than once per side, balance it last. n Balance polyatomic ions as single units. 1 SO 4 instead of 1 S and 4 O
Why is there a 2 after the oxygen? __________________ What are all the diatomic elements? _________________ Oxygen is diatomic Br, I, N, Cl, H, O, F
Reactants Products Yields SubscriptCoefficient
Counting Atoms 1) H 3 PO 4 2) 3NaOH 3) 2K 2 C 2 H 3 O 2 4) Mg 3 (PO 4 ) 2