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Cohesive forces between water molecules are responsible for a phenomenon called surface tension. As the name might imply, surface tension is the ability of the surface water to not be broken. This property allows some objects that have a much higher density than water (such as a paper clip) to float on the surface of a glass of water.

What is the BEST possible explanation for why this occurs?

A

Water molecules at the bottom of the glass pull the water molecules from the surface downwards, forcing the surface molecules to be held more tightly together.

B

Water molecules inherently form strong hydrogen bonds between each other, which cannot be easily broken.

C

Water molecules at the surface have fewer water molecules to cling to. Therefore, they form a stronger bond with each other at the surface, which is harder to break.

D

Small dense objects like a paper clip attract water molecules in a small container like a glass, so they float on the surface.

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