Structure of Water and Hydrogen Bonding

AP Biology· difficulty 4/5

water nonpolar droplet Nonpolar molecules cluster in water

Which thermodynamic factor MOST strongly drives nonpolar molecules to cluster (the hydrophobic effect)?

  • A

    Decreased temperature of the water

  • B

    Loss of all hydrogen bonds among water molecules

  • C

    Increased entropy of surrounding water when nonpolar surface area is minimized

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  • D

    Strong covalent bonds form between nonpolar molecules

Explanation

Around isolated nonpolar molecules, water forms ordered cages (low entropy). Clustering reduces total nonpolar-water interface and frees water to be disordered, raising entropy.

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