BIOCHEMISTRY
PROPERTIES OF WATER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the ice only forms on the top layer and acts as insulation for the rest of the lake.
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the ice freezes the entire lake into one giant ice cube.
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the ice freezes on the top layer, but then sinks to the bottom because ice is more dense than water.
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the ice only forms on the bottom layer, and melts quickly.
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Detailed explanation-1: -The ice formed on the surface is less dense than water and floats at the water surface. This layer acts as an insulation layer which prevents contact between the water bulk and the freezing surrounding, thus preventing further freezing of water.
Detailed explanation-2: -The density of ice is less than that of liquid water. Therefore, ice floats on the surface. Thus, the ice layer at lower temperature floats over the water below it. Due to this, the freezing of water into ice occurs continuously from the top towards the bottom.
Detailed explanation-3: -In winter, just below the ice, the coldest water at 32°F (0°C) will float on top of the warmer, denser water at the bottom of the lake. That keeps the lake from freezing completely and allows life to persist.
Detailed explanation-4: -What’s so special about ice that causes it to float? Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.
Detailed explanation-5: -Right when the water freezes to ice, the ice becomes significantly less dense than the water and continues to float on the lake’s surface. Below 4° Celsius, water becomes less dense as it gets colder, causing water about to freeze to float to the top.