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Lab: Drops on a Penny - Weebly

9/11/2013 1 Lab: Drops on a Penny Exploring Scientific Method Background Information Cohesion Water molecules are attracted to other water molecules. Background Information Surface Tension Surface tension is the cohesion of water molecules at the surface of a body of water. The cohesion forms a surface film or skin . Some substances may change the cohesive force or strength of the surface skin of the water. Identify the Problem Does soap increase, decrease, or not effect the cohesion (surface tension) of water molecules? Hypothesis Educated Guess I believe that the effect of the soap on the cohesion (surface tension) of water molecules will be to increase / decrease (circle one) Because .. Soap is slippery and will make the water fall off. Alternatively (increase) Soap is heavy and will help to hold it in place. Proper Lab Conduct Be careful not to get soap (chemical) in your eyes.

Lab: Drops on a Penny Exploring Scientific Method Background Information Cohesion Water molecules are attracted to other water molecules. Background Information Surface Tension Surface tension is the cohesion of water molecules at the surface of a body of water. …

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