Final answer:
Hydrogen bonds cause solid water to be less dense than liquid water by creating a crystal lattice with spaced farther apart molecules, resulting in ice having lower density.
Explanation:
Hydrogen bonds are responsible for making solid water less dense than liquid water. When water freezes into ice, the molecules form a crystal lattice with spaced farther apart due to the orientation of hydrogen bonds, causing ice to expand and have lower density compared to liquid water.
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