character: Ms. Sarah Lee
topic: Techniques in Water Quality Testing
grade: 11
subject: Chemistry
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character: Mr. John Smith
topic: Introduction to Water Chemistry
grade: 11
subject: Chemistry
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character: Dr. Emily Chen
topic: Dissolved Oxygen Measurement Techniques
grade: 11
subject: Chemistry
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character: Mr. Robert Brown
topic: Understanding pH Levels in Water
grade: 11
subject: Chemistry
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