character: Ms. Sarah Johnson
topic: Endothermic vs Exothermic Reactions
grade: 12
subject: Chemistry
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character: Mr. David Lee
topic: Thermodynamics Basics
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Chemical Energy and Reactions
grade: 12
subject: Chemistry
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character: Professor Mark Thompson
topic: Phase Changes and Energy Transfer
grade: 12
subject: Chemistry
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