OBJECTIVE LIFE SCIENCE
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 solid states of other liquids are denser because the molecules pack together tightly when the kinetic energy (temperature) decreases. The hydrogen bonds in water ice are indeed strong, but their orientation causes molecules to push apart, actually lowering density.
Detailed explanation-3: -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.
Detailed explanation-4: -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-5: -Because when water freezes it expands. That same mass now takes up more space. And since density is determined by mass divided by volume, frozen ice is less dense than water itself. And if you have cloudy ice, this effect is exacerbated by all of the air trapped inside the ice!