AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowingoutward in different directions. Which of these best explains this observation?
A
The bonds between hydrogen and oxygen atoms are very strong.
B
The electrons in the atoms attract the electrons in the other atoms.
C
The molecules at the surface strongly cohere to the other molecules on the surface with them
D
Water molecules near the surface produce more buoyant force than water molecules within theliquid.
Explanation: 

Detailed explanation-1: -Cohesion of water This dome-like shape forms due to the water molecules’ cohesive properties, or their tendency to stick to one another.

Detailed explanation-2: -What allows us to get such a large dome of water on top of the penny? Water has a high surface tension. This happens because water molecules like to stick together. This property is called cohesion.

Detailed explanation-3: -Surface tension and droplets: Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer.

Detailed explanation-4: -Adhesive and Cohesive Forces Specifically, these attractive forces exist between molecules of the same substance. For instance, rain falls in droplets, rather than a fine mist, because water has strong cohesion, which pulls its molecules tightly together, forming droplets.

There is 1 question to complete.