Question detail
What is the primary difference between experimental and theoretical lattice enthalpies?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Thermodynamics (A-level only)
Question
- A. Experimental lattice enthalpy is measured directly, while theoretical lattice enthalpy is calculated using models.
- B. Experimental lattice enthalpy is calculated using models, while theoretical lattice enthalpy is measured directly.
- C. Experimental lattice enthalpy considers only ionic interactions, while theoretical lattice enthalpy considers all types of bonding.
- D. Experimental lattice enthalpy is always higher than theoretical lattice enthalpy.
Answer
Experimental lattice enthalpy is measured directly, while theoretical lattice enthalpy is calculated using models.
Explanation
Experimental lattice enthalpy refers to the value obtained from direct measurements in laboratory conditions, while theoretical lattice enthalpy is derived from calculations based on ionic radii and charge. The key difference lies in their methods of determination: experimental values are subject to real-world conditions, whereas theoretical values are based on idealized models. This distinction is crucial when evaluating the accuracy of lattice enthalpy predictions, as discrepancies can indicate the presence of covalent character in ionic compounds.
Common mistake
Confusing Experimental and Theoretical Lattice Enthalpies
Students often confuse experimental lattice enthalpy with theoretical lattice enthalpy, thinking they are the same concept.
Experimental lattice enthalpy is determined through measurements, while theoretical lattice enthalpy is calculated using models based on ionic charges and sizes. To avoid confusion, remember that experimental values are obtained from real-world data, whereas theoretical values are predictions based on assumptions. Use experimental data when available to validate theoretical predictions.
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