Multiple Choice
Use the bond energies to determine the approximate enthalpy change for the following reaction: H2(g) + 1/2 O2(g) → H2O(g). Given the bond energies: H-H = 436 kJ/mol, O=O = 498 kJ/mol, and O-H = 463 kJ/mol.
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11. Bonding & Molecular Structure
Bond Energy
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which term describes the amount of energy required to break a specific covalent bond in a molecule?
A
Ionization energy
B
Lattice energy
C
Bond energy
D
Electron affinity
Verified step by step guidance1
Understand that the question asks for the term that describes the energy needed to break a specific covalent bond in a molecule.
Recall that ionization energy refers to the energy required to remove an electron from an atom or ion, not breaking bonds between atoms.
Recognize that lattice energy is the energy released when ions come together to form an ionic solid, which is unrelated to covalent bonds.
Know that electron affinity is the energy change when an atom gains an electron, also unrelated to breaking bonds.
Identify that bond energy (or bond dissociation energy) is the correct term, as it specifically measures the energy required to break a particular covalent bond in a molecule.
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