Question detail
What is the first step in constructing a Born-Haber cycle for an ionic compound?
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. Identify the ionic compound's formula
- B. Calculate the lattice enthalpy
- C. Determine the enthalpy of formation
- D. List the ionization energies
Answer
Identify the ionic compound's formula
Explanation
The first step in constructing a Born-Haber cycle is to identify the ionic compound's formula, as it provides the necessary ions for the cycle.
Common mistake
Incorrect Born-Haber Cycle Construction
Students often forget to include all relevant enthalpy changes, such as sublimation and ionization energies, when constructing Born-Haber cycles.
To correctly construct a Born-Haber cycle, include all necessary enthalpy changes: the enthalpy of formation, sublimation, ionization, and electron affinity. For example, use the formula: ΔH_f = ΔH_sublimation + ΔH_ionization + ΔH_electron_affinity + ΔH_lattice. Substitute the values for each enthalpy change, perform the calculations, and ensure all steps are represented in the cycle.
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