BIOCHEMISTRY
PROPERTIES OF WATER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a pond is slow to freeze, despite low air temperature
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a human sweats in order to cool down
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a tree takes up water from its roots
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a leaf floats on the surface of a puddle
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Detailed explanation-1: -Which of the following observations could be best explained by water’s high surface tension? A leaf floats on the surface of a puddle. Water molecules on the surface of the puddle form hydrogen bonds with one another, allowing them to resist the external force of the leaf.
Detailed explanation-2: -Which property of water best explains the high surface tension? Cohesion is a property of water that enables the high surface tension.
Detailed explanation-3: -This phenomenon can be observed in the nearly spherical shape of small drops of liquids and of soap bubbles. Because of this property, certain insects can stand on the surface of water. A razor blade also can be supported by the surface tension of water.
Detailed explanation-4: -Water’s high surface tension is due to the hydrogen bonding in water molecules. Water also has an exceptionally high heat of vaporization. Vaporization occurs when a liquid changes to a gas, which makes it an endothermic reaction.
Detailed explanation-5: -Water molecules present in leaves, stems, and roots are attracted to these tubes (due to adhesive property) and other water molecules (due to cohesive property). This enables water movement. The surface tension is responsible for generating the force that is required to pull water upward against gravity.