FOOD CHEMISTRY
CARBOHYDRATES PROTEINS AND LIPIDS
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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: -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!
Detailed explanation-3: -Ice floats on top of water because it has a lower density. Density is a substance’s mass per unit volume. Because ice crystals take up more space than liquid water, they have a higher volume and a lower density.
Detailed explanation-4: -As liquid water freezes and hydrogen bonds form between water molecules, those hydrogen bonds form a geometrical pattern called a lattice. The fixed geometry of the lattice prevents water molecules from packing close together and, therefore, from becoming denser as it freezes. Instead, water expands upon freezing.