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

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

Examples Balance the half-reaction RuO2 Ru occurring in acidic solution. Balance the half-reaction Pb HPbO2- occurring in basic solution. 10 min

Brain Break! Spot It!

Your Turn! Balance the half-reaction Cr2O72- Cr3+ occurring in acidic solution. Balance the half-reaction H2 occurring in acidic solution. 10 min

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