Question

1. what property or properties of water is demonstrated by this activity? 2. explain why you had different results for the soapy water. - use a pipet or straw to slowly drop water onto a penny. - repeat this procedure using water that contains soap. - thoroughly rinse and dry the penny before moving to the next station. data number of drops tap water soapy water experiment (ab trial) with tap water experiment (ab trial) with soapy water

Explanation:

Step1: Identify water property in tap - water case

Surface tension of water allows water molecules to stick together and form a dome - like shape on the penny. This is why a certain number of drops can accumulate on the penny.

Step2: Analyze soapy water property

Soap is a surfactant. It reduces the surface tension of water. When soapy water is used, the water molecules don't stick together as strongly, so fewer drops can accumulate on the penny before it overflows.

Answer:

1. The property of water demonstrated by this activity is surface tension. Water molecules have cohesive forces due to hydrogen - bonding, which causes them to stick together and form a dome - like shape on the penny.
2. Different results for soapy water are obtained because soap is a surfactant that reduces the surface tension of water. With lower surface tension, the water on the penny spreads out more easily and fewer drops can be placed on the penny before it overflows.