1. Clicker #1 Which is lower in potential energy and more stable? unburned match or burned match A) unburned match B) burned match

2. Example #1 Is the freezing of water an endothermic or exothermic process? (The system is underlined.) Exothermic

3. Clicker #2 Is the boiling of water an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

4. Example #2 Is an activated cold pack an endothermic or exothermic process? (The system is underlined.) Endothermic

5. Clicker #3 Is an activated hot pack an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

6. Clicker #4 Is a racquetball frozen by liquid nitrogen an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

7. Example #3 Is the thermite reaction (the chemical reaction) an endothermic or exothermic process? (The system is underlined.) Exothermic