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A Levels Biology (9700)•9700/12/O/N/19
Question 13 from 9700/12/O/N/19

Explanation

Accuracy of water's physical and chemical properties

Steps:

  • Evaluate statement 1: Water's high specific heat capacity absorbs heat without large temperature changes, stabilizing aquatic and biological environments.
  • Evaluate statement 2: Water's latent heat of vaporization is high (not low), enabling efficient evaporative cooling in mammals like sweating.
  • Evaluate statement 3: Negative ions attract the partial positive charge (δ+) on water's hydrogen atoms, forming hydration shells.
  • Evaluate statement 4: In aqueous solutions with ions, the hydrophobic effect causes non-polar molecules to cluster together, not push apart.

Why B is correct:

  • Statements 1 and 3 align with water's high specific heat for thermal stability and its polarity enabling ion hydration via δ+ hydrogen attraction.

Why the others are wrong:

  • A includes incorrect statements 2 and 4.
  • C selects only false statement 2 about low latent heat.
  • D pairs two incorrect statements, 2 and 4.

Final answer: B

Topic: Water

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