character: Mr. Brian Smith
topic: Chemical Reactions in Water Filtration
grade: 9
subject: Chemistry
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character: Ms. Laura Johnson
topic: Water Purification Techniques
grade: 9
subject: Chemistry
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character: Dr. Emily Chen
topic: Chemical Properties of Water
grade: 9
subject: Chemistry
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character: Mr. James Thompson
topic: Environmental Impact of Water Treatment
grade: 9
subject: Chemistry
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