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Cohesiveness Lab Report

Miscellaneous By: callmecaylen
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Project testing cohesiveness in water.


Submitted:Nov 9, 2012    Reads: 43    Comments: 0    Likes: 0   


Cohesiveness of Water Lab

Introduction:

Cohesion is the attraction between molecules of the same substance. Adhesion is the attraction between molecules of a different substance. Water's molecules can stick to both its own substance and a different substance making it both cohesive and adhesive. Water is a mixture of oxygen atoms, and hydrogen atoms, also known as H2O.

This lab was conducted so scientist know what substance effects the cohesiveness of water molecules. This would be important to know for people who are working with bathtubs, or pools, so they would know what substance to put in water and what not to put into water.

Hypothesis:

More clips will be held inside of the container with plain water, than the container with soapy water, therefore the water with soap will be less cohesive.

Materials:

Materials in this lab include;

  • Box of small paper clips
  • Small plastic container
  • Eyedropper
  • Cup
  • Stirring rod
  • Water
  • Liquid soap
  • Plastic tray

Procedure:

Part A:

  1. Estimate how many paper clips will fit into a completely full cup of water, record data onto chart.
  2. Place your small container on a tray to contain any water that may spill
  3. Fill plastic cup with tap water
  4. Pour tap water from your cup into small container
  5. Add water by eyedropper until the top surface appears rounded
  6. Slowly add paper clips one at a time to the cup, keeping count of all that you add
  7. Stop adding clips when water spills from the top of the cup
  8. Record data, and compare with your hypothesis

Part B:

  1. Again estimate how many paper clips will fit into a completely full cup of soapy water, record this number into table 2
  2. Place small container on a tray to contain any spilt water
  3. Fill plastic cup with tap water
  4. Add drops of liquids soap, and use stirring rod to mix
  5. Pour soapy water from your cup into smaller container
  6. Continue to add soapy water by eye dropper until the top surface appears rounded
  7. Add paper clips one at a time to the container keeping count of the paper clips you add
  8. Stop adding paper clips to the container when the water spills from the top.

Conclusion:

In this lab you will find that when is not mixed with another substance such as soap there will be more cohesiveness. Soap separates the water molecules making it harder for water molecules to stick together. More clips were held inside of the container with plain water, than the container with soapy water, therefore the water with soap will be less cohesive.





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