AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The “film” that forms on top of water is referred to as ____
A
Adhesion
B
Capillary action
C
Surface tension
D
Cohesion
Explanation: 

Detailed explanation-1: -Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.

Detailed explanation-2: -The meniscus (plural: menisci, from the Greek for “crescent") is the curve in the upper surface of a liquid close to the surface of the container or another object, produced by surface tension.

Detailed explanation-3: -The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to solids. In materials science, surface tension is used for either surface stress or surface energy.

Detailed explanation-4: -An example of such an organism is the water strider, which can run across the surface of water, due to the intermolecular forces of the molecules, and the force of the strider which is distributed to its legs. Surface tension also allows for the formation of droplets that we see in nature.

Detailed explanation-5: -Water has an unusually high surface tension because of the relatively high attraction of water molecules to each other through a web of hydrogen bonds, water has a higher surface tension than most other liquids.

There is 1 question to complete.