Question detail
Which of the following best describes the relationship 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. They are always equal.
- B. Experimental values are typically lower due to real-world interactions.
- C. Theoretical values are always higher due to ideal conditions.
- D. There is no relationship between them.
Answer
Experimental values are typically lower due to real-world interactions.
Explanation
Experimental lattice enthalpy values are often lower than theoretical values because they account for real-world interactions, including covalent character and other forces that may not be considered in theoretical calculations. The key difference lies in the methods of determination: experimental values reflect actual measurements, while theoretical values are based on idealized models. This distinction is important when analyzing the accuracy of lattice enthalpy predictions and understanding the behavior of 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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