4.3 - Bond Enthalpies
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Practice Questions
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What is bond enthalpy?
💡 Hint: Think about the energy required to disrupt chemical connections.
In an exothermic reaction, what happens to energy?
💡 Hint: Relate to the temperature change observed.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the bond enthalpy of a C-H bond approximately?
💡 Hint: Recall the values for common bonds.
True or False: Bond enthalpy values are exact for every molecule.
💡 Hint: Think about the variation in chemical environments.
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Challenge Problems
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Predict the enthalpy change for the reaction: C2H4(g) + H2(g) → C2H6(g). Given: C=C = 612 kJ/mol, C-H = 414 kJ/mol. Calculate using bond enthalpies.
💡 Hint: Set up your energy values carefully and watch your signs!
Discuss how factors like bond order influence reactions with an example, particularly focusing on C-H vs C=C bonds in terms of stability and energy.
💡 Hint: Consider the physical attributes of the bonds when constructing your example.
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