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character: Mr. Robert Brown
topic: Energy Changes in Chemical Reactions
grade: 9
subject: Chemistry
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character: Mr. Robert Brown
topic: Endothermic and Exothermic Reactions
grade: 9
subject: Chemistry
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character: Mr. Robert Brown
topic: The Law of Conservation of Energy in Chemistry
grade: 9
subject: Chemistry
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character: Mr. Robert Brown
topic: Activation Energy and Reaction Rate
grade: 9
subject: Chemistry
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