character: Chris
topic: The Law of Conservation of Mass
grade: 9
subject: Science
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character: Dr. Atom
topic: Chemical Reactions and Mass
grade: 9
subject: Science
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character: Ms. Molecule
topic: Balancing Chemical Equations
grade: 9
subject: Science
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character: Professor Reaction
topic: Applications of Conservation of Mass in Chemistry
grade: 9
subject: Science
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