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Updated: 3/26/2019
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Storyboard Text

  • Cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another. The cohesion of water also accounts for the raindrops instead of mist. It is responsible for water's continuous flow without breaking. It is as if the hydrogen bond is a tying material which holds together a molecule of water, preventing their separation.
  • Claim: The cohesive property of water is due to the hydrogen bonds which serve as a force of attraction between molecule to another molecule of water. EV: The hydrogen bonds with the water to create an almost "skin-like" surface for the paperclip to "float". If the conditions are right, they can hold tight enough to support the paperclip.
  • RE: This is made possible by the cohesion of water molecules on the surface of the water. When they say that water molecules are cohesive, they mean that they stick tightly to one another- so much so that they create surface tension. 
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