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

The transition of water from a liquid to a gas during evaporation requires a substantial energy input to primarily overcome

A. The covalent O-H bonds within the water molecule
B. The hydrogen bonds between water molecules
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C. The van der Waals forces between oxygen atoms
D. The ionic interactions between hydronium and hydroxide ions

📝 Explanation

Evaporation is a physical change, not a chemical one. The covalent bonds within the molecule are not broken. The energy (latent heat of vaporization) is used to overcome the attractive intermolecular hydrogen bonds holding the water molecules together in the liquid phase.

📖 Additional Information

  • The covalent O-H bonds within the water molecule
  • The hydrogen bonds between water molecules
  • The van der Waals forces between oxygen atoms
  • The ionic interactions between hydronium and hydroxide ions

Evaporation is a physical change, not a chemical one. The covalent bonds within the molecule are not broken. The energy (latent heat of vaporization) is used to overcome the attractive intermolecular hydrogen bonds holding the water molecules together in the liquid phase.

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