Question detail
Explain how lattice enthalpy can be used to infer the covalent character of an ionic compound.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Thermodynamics (A-level only)
Question
Explain how lattice enthalpy can be used to infer the covalent character of an ionic compound.
Answer
Lattice enthalpy is the energy required to separate one mole of an ionic compound into its gaseous ions. A higher lattice enthalpy indicates stronger ionic bonding, while a lower lattice enthalpy suggests the presence of covalent character. If the experimental lattice enthalpy is significantly lower than the theoretical value calculated assuming purely ionic bonding, this indicates that covalent interactions are present, suggesting the compound has some covalent character.
Explanation
This answer effectively demonstrates understanding of how lattice enthalpy relates to ionic and covalent bonding. It tests the student's ability to connect theoretical concepts with practical implications in chemical bonding.
Common mistake
Misunderstanding Lattice Enthalpy
Students often confuse lattice enthalpy with covalent character, thinking that higher lattice enthalpy always indicates stronger covalent bonding.
To fix this, students should focus on understanding that lattice enthalpy reflects the strength of ionic bonds, while covalent character arises from the degree of electron sharing between atoms.
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