NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As water freezes, it expands and its density decreases.
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As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
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As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
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As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
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Detailed explanation-1: -Water expands when it freezes making it less dense than the water from which it freezes. In fact, its volume is a little over 9% greater (or density ca. 9% lower) than in the liquid state. For this reason, ice floats on the water (like an ice cube in a glass of water).
Detailed explanation-2: -The “stuff” (molecules) in water is more tightly packed than in ice, so water has greater density than ice. Don’t let the fact that ice is a solid fool you! As water freezes it expands. So, ice has more volume (it takes up more space, but has less density) than water.
Detailed explanation-3: -Complete answer: Ice is solid so it floats on water because water molecules expand on freezing and form an open cage-like structure. This leads to a decrease in the density of ice. This means for a given mass ice will have more volume as compared to liquid water. Thus, being lighter ice floats on water.