Ch. 3 - Chemical Reactions

Ch. 3 - Chemical Reactions

Ch. 8 Chemical Reactions II. Balancing Equations (p. 250-254) C. Johannesson I II III IV V 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!!! C. Johannesson B. Helpful Tips Balance one element at a time. Update ALL atom counts after adding a coefficient. If an element appears more than

once per side, balance it last. Balance polyatomic ions as single units. 1 SO4 instead of 1 S and 4 O C. Johannesson C. Balancing Example Aluminum and copper(II) chloride react to form copper and aluminum chloride. 2 Al + 3 CuCl2 3 Cu + 2 AlCl3 2 1 Al 1 2

3 1 Cu 1 3 6 2 Cl 3 6 C. Johannesson

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