character: Mr. Smith
topic: The Role of Ionic Compounds in Food Preservation
grade: 9
subject: Chemistry
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character: Mrs. Johnson
topic: Chemical Reactions in Food Preservation
grade: 9
subject: Chemistry
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character: Dr. Lee
topic: Understanding Food Additives and Their Effects
grade: 9
subject: Chemistry
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character: Ms. Patel
topic: The Chemistry Behind Common Food Preservatives
grade: 9
subject: Chemistry
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