When water freezes at 0°C its density decreases due to_______________?
Correct answer: C. Empty space present in the structure of ice
- A. Change of bond angles
- B. Cubic structure of ice
- C. Empty space present in the structure of ice
- D. Change of bond length
Explanation
When water freezes, hydrogen bonds arrange its molecules into an open lattice containing empty spaces, so the same mass occupies a larger volume and density decreases. Students may choose change of bond angle, but the important consequence is the open structure and its empty spaces.
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About Anomalous Behaviour of Water
Water expands when cooled below 4°C and when it freezes, giving liquid water its maximum density at 4°C. The explanation depends on hydrogen bonding and the open structure of ice, which makes ice less dense than water and allows it to float.
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