character: Joseph Priestley
topic: Discovery of Oxygen
grade: 9
subject: Chemistry
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character: Antoine Lavoisier
topic: Role in Chemical Reactions
grade: 9
subject: Chemistry
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character: Robert Boyle
topic: Gas Laws and Reactions
grade: 9
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Chemical Reactions
grade: 9
subject: Chemistry
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