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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The fact that ice floats on water is attributed to the

A. Decrease in the mass of water molecules upon freezing
B. Formation of a regular, open hexagonal lattice by hydrogen bonds
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C. Increase in the kinetic energy of water molecules at 0°C
D. Absence of covalent bonds in the solid state

📝 Explanation

In ice, each water molecule forms a maximum of four hydrogen bonds in a rigid, crystalline hexagonal lattice. This structure holds molecules farther apart on average than in the liquid state, reducing the density. This lattice is an open, ordered arrangement, maximizing H-bonding.

📖 Additional Information

  • Decrease in the mass of water molecules upon freezing
  • Formation of a regular, open hexagonal lattice by hydrogen bonds
  • Increase in the kinetic energy of water molecules at 0°C
  • Absence of covalent bonds in the solid state

In ice, each water molecule forms a maximum of four hydrogen bonds in a rigid, crystalline hexagonal lattice. This structure holds molecules farther apart on average than in the liquid state, reducing the density. This lattice is an open, ordered arrangement, maximizing H-bonding.

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