5.1 - Enthalpy and Heat Flow
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Practice Questions
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What is the definition of enthalpy?
💡 Hint: Think about the heat dynamics during a chemical process.
Identify whether the reaction 2H₂ + O₂ → 2H₂O is exothermic or endothermic.
💡 Hint: Consider the release of energy during combustion reactions.
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Interactive Quizzes
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What type of reaction absorbs heat?
💡 Hint: Think about how temperature changes during the reaction.
True or False: Enthalpy change can be measured indirectly using Hess's Law.
💡 Hint: Consider the significance of path independence in thermodynamic calculations.
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Challenge Problems
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Given the formation enthalpy values for O₂, N₂, and NH₃, calculate the ΔH for 2NH₃(g) → N₂(g) + H₂(g).
💡 Hint: You may have to reverse the formation equation for the products.
Explain why reactions with high ΔH are often slow and require a temperature increase to proceed.
💡 Hint: Think about the energy required to break bonds and initiate reactions.
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