Electronegativity: Why Does The Water Drop Of Water

Have you ever dropped oil on your hands and tried to wash it off? What happens? Does the water slide off? Or what about when a drop of oil falls in a glass of water? Why does it float to the surface, and not mix? The answer to this is simple: polarity. What exactly is polarity? A polar bond is when there is a difference in electronegativity, which means the tendency of an atom to attract a bonding pair of electrons. When two atoms are bonded together and one attracts more electrons, this results in a polar bond. If the atoms have a similar or close to similar amounts of electronegativity, the compound is nonpolar. When two compounds that have different polarities are put in a situation together, they will not attract. If compounds of the same polarity are put together, they will attract. All liquids have a certain property called surface tension. Surface tension exists in the milk that was used to fill a
Is it possible to fit more than one? Ten? In the Drops on a Penny Lab (Lab 4), this question was tested. A pipette was used to drop drops of water onto a dry penny. As more drops of water were added to the penny, the water molecules seemed to build up. Soon, there was a dome of water forming on top of the penny. This is because of hydrogen bonding. More specifically, the cohesion and surface tension in hydrogen bonding. Hydrogen bonding is when hydrogen is bonded to either nitrogen, oxygen, or fluorine and then feels an attraction to other molecules of this kind. All hydrogen bonds are polar. Cohesive forces, a part of hydrogen bonding, was causing the water molecules to be attracted to one another. The dome shape is the result of the cohesive forces found in the water molecules. However, when the drops of detergent water were dropped, there was no bubble. The detergent acted as a block to the cohesive forces. The forces were still there, but they were weaker, and the dome wasn’t as