Question

part 1 pennies and water question 1: how many drops of water did fit on the head of a penny? use a pipet or straw to slowly drop water onto a penny counting each drop. 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 1. what property or properties of water is demonstrated by this activity? 2. explain why you had different results for the soapy water.

Explanation:

1. The property demonstrated by this activity is surface - tension. Water molecules have strong cohesive forces due to hydrogen bonding, allowing water to form a dome - like shape on the penny. Soap is a surfactant that reduces the surface - tension of water. When soapy water is used, the reduced surface - tension causes fewer drops to fit on the penny compared to tap water.
2. Different results for soapy water are due to the surfactant in soap breaking the hydrogen bonds between water molecules, decreasing surface - tension. This makes the water more likely to spread out and not form as large of a dome on the penny, resulting in fewer drops fitting.

Answer:

1. Surface - tension is demonstrated.
2. The surfactant in soap reduces water's surface - tension, causing different results.