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II. Balancing Equations (p. 320-329)

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Ch. 11 – Chemical Reactions. II. Balancing Equations (p. 320-329). 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.

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a balancing steps
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
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 balancing example
C. Balancing Example

Al + CuCl2 Cu + AlCl3

Al

Cu

Cl

Aluminum and copper(II) chloride react to form copper and aluminum chloride.

2

3

3

2

 2

 6

1 1

1 1

2 3

2 

3 

6 

 3

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