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Cohesion and Surface Tension

Cohesion and Surface Tension. Directions: Read the following information. Write a four sentence summary of the information on a piece of notebook paper. Share your summary with your table group. Share your summary with the class. . Cohesion. Cohesion

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Cohesion and Surface Tension

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  1. Cohesion and Surface Tension Directions: Read the following information. Write a four sentence summary of the information on a piece of notebook paper. Share your summary with your table group. Share your summary with the class.

  2. Cohesion Cohesion • Water molecules are attracted to other water molecules. The oxygen end of water has a negative charge and the hydrogen end has a positive charge. The hydrogen atoms of one water molecule are attracted to the oxygen atoms from other water molecules. This attractive force is what gives water its cohesive properties.

  3. Water Cohesion • Water has a very simple atomic structure. This structure consists of two hydrogen atoms bonded to one oxygen atom. The nature of the atomic structure of water causes its molecules to have unique electrochemical properties. The hydrogen side of the water molecule has a slight positive charge. On the other side of the molecule a negative charge exists. This molecular polarity is responsible for its strong surface tension .

  4. Surface Tension Surface Tension • Surface tension is the name we give to the cohesion of water molecules at the surface of a body of water. The cohesion of water molecules forms a surface "film" or “skin.” Some substances may reduce the cohesive force of water, which will reduce the strength of the surface “skin” of the water.

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