character: Antoine Lavoisier
topic: The Law of Conservation of Mass in Chemical Reactions
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Mass Conservation
grade: 12
subject: Chemistry
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character: Joseph Proust
topic: Law of Definite Proportions
grade: 12
subject: Chemistry
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character: Dmitri Mendeleev
topic: Periodic Law and Chemical Reactions
grade: 12
subject: Chemistry
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