character: Student D
topic: Chemical Reactions and Energy Changes
grade: 9
subject: Chemistry
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character: Student A
topic: Types of Chemical Reactions
grade: 9
subject: Chemistry
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character: Student B
topic: Endothermic and Exothermic Reactions
grade: 9
subject: Chemistry
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character: Student C
topic: The Law of Conservation of Mass
grade: 9
subject: Chemistry
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