1)Which property of water allows some lightweight insects to walk on top of a pond and not fall in?
A)Adhesion between water molecules creates capillary action
B)cohesion between water molecules creates surface tension
C)Cohesion betweenwater molecules creates an uneven charge distribution
D)Adhesion between water moleculesand the insect's feet creates a meniscus.
Our science tutors mostly deal with physics and chemistry. Sometimes one of them answers biology questions, but not always.
1. Be sure that you indicate what YOU THINK the correct answers are for any questions you post. If possible, a tutor will check your work.
2. Make good use of the Biology section at https://www.khanacademy.org/ — click on Courses at the top left and then choose the particular course you need help with.
Is it B)
B) Cohesion between water molecules creates surface tension
The correct answer is B) cohesion between water molecules creates surface tension.
To understand why this is the correct answer, let's go through the options one by one:
A) Adhesion between water molecules creates capillary action: Capillary action refers to the ability of a liquid to flow in narrow spaces or tubes. While adhesion between water molecules does contribute to capillary action, it is not directly related to why lightweight insects can walk on the surface of a pond.
C) Cohesion between water molecules creates an uneven charge distribution: This statement is not accurate. Cohesion between water molecules is primarily due to their ability to form hydrogen bonds, not their charge distribution.
D) Adhesion between water molecules and the insect's feet creates a meniscus: A meniscus refers to the curved surface of a liquid in a tube or container. While adhesion between water molecules and the insect's feet may play a role, it is not the main reason why insects can walk on the water's surface.
Now let's look at option B) cohesion between water molecules creates surface tension: Surface tension is caused by the cohesive forces between water molecules at the surface of a liquid. It is the property that allows some lightweight insects, such as water striders, to walk on the surface of water without breaking through. The surface tension of water creates a "skin-like" layer on the water's surface that can support the weight of these insects, similar to how a rubber band stretched across two points can support small objects placed on it.
Therefore, the correct answer is B) cohesion between water molecules creates surface tension.