character: Mr. Smith
topic: Understanding Purification Processes
grade: 9
subject: Chemistry
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character: Dr. Johnson
topic: Filtration Methods in Chemistry
grade: 9
subject: Chemistry
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character: Ms. Lee
topic: Distillation Techniques for Purification
grade: 9
subject: Chemistry
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character: Mr. Davis
topic: Chromatography: Principles and Applications
grade: 9
subject: Chemistry
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