5.2.2 - Enthalpy, H
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Practice Questions
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What does ∆H represent in a chemical reaction?
💡 Hint: Think of how energy changes during a reaction.
Is a reaction with a negative ∆H exothermic or endothermic?
💡 Hint: Remember how heat moves in exothermic reactions.
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Interactive Quizzes
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What is the relationship between enthalpy and heat transfer during a chemical reaction?
💡 Hint: Think about how we calculate heat changes.
True or False: A positive ∆H indicates an exothermic reaction.
💡 Hint: Recall the signs associated with heat flow.
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Challenge Problems
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Calculate the enthalpy change if 2 moles of H2O (l) are converted to H2O (g) at 100°C, given ∆Hvap = 40.79 kJ/mol.
💡 Hint: Remember the phase transition formulas for vaporization.
You have a reaction that involves multiple steps: A + B → C (∆H = -50 kJ), C + D → E (∆H = +20 kJ). What is the overall enthalpy change for the reaction A + B + D → E?
💡 Hint: Apply Hess's Law for summing the reactions.
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