Prediction to the following question How does soap affect the number of water drops that the surface of a penny can hold, compared with the number of drops that a penny without soap can hold?
Based on properties and behavior of soap, it can be predicted that soap would reduce the number of water drops that the surface of a penny can hold, compared to a penny without soap.
Soap is a surfactant, which means it reduces the surface tension of water. Surface tension is the force that allows water molecules to stick together, forming droplets. When soap is added to water, it decreases the surface tension, causing water to spread out and form a thinner layer on the surface.
With a smaller surface tension, the water droplets on a soapy penny would be less cohesive and more likely to merge or spread out. This would result in fewer drops being able to cling to the surface of the penny compared to a penny without soap.
Therefore, it can be predicted that the surface of a penny with soap would hold a lower number of water drops than a penny without soap.