character: Mr. Smith
topic: The Role of Salts in Food Preservation
grade: 9
subject: Chemistry
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character: Ms. Johnson
topic: Chemical Properties of Preservatives
grade: 9
subject: Chemistry
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character: Dr. Williams
topic: Exploring Ethnic Food Preservation Methods
grade: 9
subject: Chemistry
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character: Mr. Brown
topic: The Science Behind Canning and Pickling
grade: 9
subject: Chemistry
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