character: Ms. Johnson
topic: Chemical Properties of Preservatives
grade: 9
subject: Chemistry
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character: Mr. Smith
topic: Introduction to Organic Compounds
grade: 9
subject: Chemistry
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character: Ms. Lee
topic: Acids, Bases, and pH Scale
grade: 9
subject: Chemistry
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character: Dr. Brown
topic: Reactions of Common Household Chemicals
grade: 9
subject: Chemistry
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