3.3 - Estimating Reaction Enthalpies with Bond Enthalpies
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Practice Questions
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What is the bond enthalpy of a C–H bond?
💡 Hint: Look in a reference table for average bond enthalpies.
Define an exothermic reaction.
💡 Hint: Think about whether energy is entering or leaving the system.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does bond enthalpy measure?
💡 Hint: Consider the energy dynamics during the bond formation and breaking.
True or False: An exothermic reaction has a positive ΔH.
💡 Hint: Recall how heat is exchanged in exothermic and endothermic reactions.
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Challenge Problems
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Estimate the reaction enthalpy for the dehydration of alcohols using bond enthalpies. An alcohol like C₂H₅OH forms ethylene (C₂H₄) and water (H₂O). Calculate ΔH based on the bonds involved.
💡 Hint: Focus on breaking the C–O bond and forming double bonds in C₂H₄.
Discuss how bond enthalpies vary in a different phase and how that affects ΔH estimations for reactions that involve liquid and gaseous states.
💡 Hint: Consider what happens when water transitions from liquid to gas.
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