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4 cards from this section. Quick, good the night before a test.
What is the bond enthalpy of a C–H bond?
Look in a reference table for average bond enthalpies.
Define an exothermic reaction.
Think about whether energy is entering or leaving the system.
What does bond enthalpy measure?
Consider the energy dynamics during the bond formation and breaking.
True or False: An exothermic reaction has a positive ΔH.
Recall how heat is exchanged in exothermic and endothermic reactions.
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.
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.
Consider what happens when water transitions from liquid to gas.
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