1. Lesson 4: Balancing Half-Reactions
UNIT 7:
Lesson 4: Balancing Half-Reactions

2. To Balance Half-Reactions: Use Major Hydroxide!
MAJOR – balance major atoms (everything but O and H) O – balance O atoms by adding H2O molecules H – balance H atoms by adding H+ - – balance the charge by adding electrons

3. Examples
Balance the half-reaction RuO Ru occurring in acidic solution.
Balance the half-reaction Pb HPbO2- occurring in basic solution.
10 min

4. Brain Break!
Spot It!

5. Your Turn!
Balance the half-reaction Cr2O Cr3+ occurring in acidic solution.
Balance the half-reaction H occurring in acidic solution.
10 min

6. Practice:
Pg. 203 #19 (a-j)
20 min