Lattice energy and Born-Haber cycles Quiz
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5 questions, one answer each
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1. Which equation represents the lattice energy of calcium chloride?
- A. CaCl₂(s) → Ca²⁺(g) + 2Cl⁻(g)
- B. Ca²⁺(g) + 2Cl⁻(g) → CaCl₂(s)
- C. Ca(g) + Cl₂(g) → CaCl₂(s)
- D. Ca²⁺(g) + Cl₂(g) → CaCl₂(s)
2. The enthalpy of formation of KCl is −437 kJ mol⁻¹, and the sum of the atomisation, ionisation and electron affinity steps is +281 kJ mol⁻¹. What is the lattice energy?
- A. −156 kJ mol⁻¹
- B. +156 kJ mol⁻¹
- C. −281 kJ mol⁻¹
- D. −718 kJ mol⁻¹
3. Why is the second electron affinity of oxygen endothermic?
- A. An electron is added to a negative ion, which repels it
- B. Oxygen atoms are very large
- C. The first electron affinity was endothermic
- D. The oxide ion is unstable in the gas phase because it has a full shell
4. The experimental lattice energy of a compound is much more exothermic than the theoretical value. What does this suggest?
- A. The compound is purely ionic
- B. The Born–Haber cycle was incorrectly drawn
- C. The bonding has some covalent character
- D. The ions are too small
5. Which compound is expected to show the greatest covalent character?
- A. NaF
- B. NaCl
- C. AgI
- D. MgO