OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Liquid water contains an excessive amount of suspended nutrients
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A water molecule is cohesive but not adhesive
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The solid form of water floats on the liquid form
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Hydrogen bonding is unable to freeze an entire body of water
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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 high concentration of salt in ocean water lowers its freezing point from 32° F (0° C) to 28° F (-2° C). As a result, the ambient temperature must reach a lower point in order to freeze the ocean than to freeze freshwater lakes.
Detailed explanation-3: -Fill a plastic bottle with water and a cup of salt. The salt will keep the water in the bottle from freezing. The bottle will then float at the top of the bucket preventing it from freezing.
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: -The bottom of a lake do not freeze in severe winter. The reason is that ice is a poor conductor of heat hence once the surface is frozen no further heat is liberated or absorbed by water beneath ice.