character: Ms. Laura Johnson
topic: Water Purification Techniques
grade: 9
subject: Chemistry
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character: Mr. Tom Richards
topic: Introduction to Chemical Reactions
grade: 9
subject: Chemistry
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character: Dr. Sarah Mitchell
topic: Environmental Chemistry and Water Quality
grade: 9
subject: Chemistry
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character: Ms. Emily Thompson
topic: Basic Principles of Filtration
grade: 9
subject: Chemistry
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