Lattice energy and Born-Haber cycles Quiz
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5 questions, one answer each
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1. Which is endothermic?
- A. Cl(g) + e⁻ → Cl⁻(g)
- B. Na⁺(g) + Cl⁻(g) → NaCl(s)
- C. Na(g) → Na⁺(g) + e⁻
- D. Na⁺(g) + e⁻ → Na(g)
2. NaF has = −574; atomisation of Na +107; ½F₂ +79; IE₁(Na) +496; EA₁(F) −328 kJ mol⁻¹. What is its lattice energy?
- A. −928 kJ mol⁻¹
- B. −1042 kJ mol⁻¹
- C. −574 kJ mol⁻¹
- D. +928 kJ mol⁻¹
3. For CaCl₂ the Born–Haber cycle must include:
- A. One chlorine atomisation
- B. Twice the electron affinity of chlorine
- C. The second electron affinity of chlorine
- D. Only the first ionisation energy of calcium
4. Which describes the first electron affinity?
- A. Gaseous atoms gaining one electron each
- B. Gaseous 1− ions losing one electron each
- C. Solid atoms gaining one electron
- D. Gaseous 1− ions gaining an electron
5. Why is lattice energy negative in Edexcel's definition?
- A. The ions are formed from atoms
- B. The solid is formed from gaseous ions, releasing energy
- C. The lattice is broken
- D. Electrons are removed