A Levels Biology (9700)•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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