Entropy and spontaneous change

Entropy and spontaneous change Quiz

Spec 12.1–5 · Edexcel International A Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Which has the highest entropy at 298 K, for one mole of the substance?

    • A. H₂O(l)
    • B. H₂O(g)
    • C. H₂O(s)
    • D. NaCl(s)

  2. 2. What is the entropy of a perfect crystal at 0 K?

    • A. Zero
    • B. Maximum
    • C. The same as the liquid
    • D. Negative

  3. 3. Which reaction has the greatest increase in entropy of the system?

    • A. 2Mg(s) + O₂(g) → 2MgO(s)
    • B. N₂(g) + 3H₂(g) → 2NH₃(g)
    • C. H₂O(g) → H₂O(l)
    • D. CaCO₃(s) → CaO(s) + CO₂(g)

  4. 4. How can an endothermic reaction occur spontaneously?

    • A. The reaction releases heat
    • B. The activation energy is low
    • C. The total entropy increases
    • D. The entropy of the system decreases

  5. 5. Why does the entropy of the system increase when sodium chloride dissolves in water?

    • A. Ions are more strongly bonded in solution
    • B. Ions move from fixed lattice positions to being randomly dispersed in solution
    • C. The lattice enthalpy is positive
    • D. Water molecules solidify around the ions

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