Entropy Quiz
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5 questions, one answer each
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1. Which change has the largest positive entropy change?
- A. H₂O(g) → H₂O(l)
- B. H₂O(l) → H₂O(s)
- C. H₂O(l) → H₂O(g)
- D. H₂O(s) → H₂O(l)
2. Standard entropies (J K⁻¹ mol⁻¹): Na(s) = 51, Cl₂(g) = 223, NaCl(s) = 72. What is ΔS for 2Na(s) + Cl₂(g) → 2NaCl(s)?
- A. −181 J K⁻¹ mol⁻¹
- B. +181 J K⁻¹ mol⁻¹
- C. −202 J K⁻¹ mol⁻¹
- D. +469 J K⁻¹ mol⁻¹
3. Which best describes entropy?
- A. The heat released in a reaction
- B. The strength of the bonds in a molecule
- C. The energy needed to start a reaction
- D. A measure of the disorder of a system
4. Which is the correct unit for entropy?
- A. kJ mol⁻¹
- B. J K⁻¹ mol⁻¹
- C. J mol⁻¹
- D. K J⁻¹ mol⁻¹
5. Which reaction has the most positive entropy change?
- A. 2H₂(g) + O₂(g) → 2H₂O(g)
- B. N₂(g) + 3H₂(g) → 2NH₃(g)
- C. CaCO₃(s) → CaO(s) + CO₂(g)
- D. Mg(s) + ½O₂(g) → MgO(s)