character: Dr. Wang
topic: Acid-Base Reactions in Food Preservation
grade: 11
subject: Chemistry
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character: Ms. Johnson
topic: The Role of pH in Food Safety
grade: 11
subject: Chemistry
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character: Mr. Smith
topic: Chemical Preservatives and Their Alternatives
grade: 11
subject: Chemistry
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character: Dr. Lee
topic: Understanding Fermentation as a Preservation Method
grade: 11
subject: Chemistry
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