character: Dr. Smith
topic: The Role of Organic Acids in Food Preservation
grade: 11
subject: Chemistry
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character: Professor Johnson
topic: The Chemistry of Food Additives
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Understanding pH Levels in Food Safety
grade: 11
subject: Chemistry
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character: Mr. Patel
topic: Natural Preservatives: A Comprehensive Study
grade: 11
subject: Chemistry
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