character: Mr. Johnson
topic: Chemical Disinfection Processes
grade: 12
subject: Chemistry
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character: Dr. Smith
topic: Methods of Water Treatment
grade: 12
subject: Chemistry
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character: Ms. Davis
topic: Chemical Reactions in Everyday Life
grade: 12
subject: Chemistry
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character: Mr. Lee
topic: Environmental Chemistry and Pollution Control
grade: 12
subject: Chemistry
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