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Chapter 11: Problem 11

A small drop of water assumes an almost spherical form on a Teflon surface. Explain why.

Short Answer

Expert verified
A droplet of water forms an almost spherical shape on a Teflon surface because the water molecules are attracted to each other rather than the Teflon surface due to its water-resistant characteristics. As a result, the surface tension of the water forces it into the smallest possible shape, which is nearly a perfect sphere.

Step by step solution

01

Understanding the Shape of Liquids

Firstly, one needs to understand why liquids like water can form shapes. It's because the molecules of a liquid attract each other, creating a kind of 'tension' on the surface. This tension tries to minimize the area of the surface which is only possible for the sphere shape, as it has the minimum area for a given volume.
02

Recognizing the Characteristics of Teflon

Teflon is characterized by its non-stick and water-repellent properties. When water comes into contact with Teflon, there's a resistance or inability for the water to 'stick' to the Teflon surface due to these inherent characteristics of Teflon.
03

Connecting the Characteristics of Water and Teflon

When water is put on a Teflon surface, the water molecules are attracted to each other, not the Teflon. This attraction forces the water to stay together in the smallest possible area, creating a nearly perfect sphere, due to aforementioned properties of liquid.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Water Properties
Water has some incredible properties, making it a fascinating and vital part of life on Earth. One of these properties is surface tension, which is the effect of the cohesive force among the molecules of water.
This means that water molecules are inclined to stick to each other. Imagine a delicate skin formed at the surface because of this tension.
  • This 'skin' is why water droplets can hold a spherical shape.
  • The spherical shape is extremely efficient, as it minimizes the surface area for a given volume.
This phenomenon reflects water's intrinsic property to conserve energy, forming shapes that take the least energy to maintain, like spheres. These properties become especially noticeable when water interacts with other surfaces.
Molecular Attraction
Molecular attraction is a key player when understanding why water forms into droplets. In liquids, molecules have stronger attractions to each other compared to gases, but these tend to be weaker than those in solids.
These attractions are due to forces like hydrogen bonding, particularly vital in water due to the polar nature of its molecules.
  • Hydrogen bonds cause water molecules to cling together, pulling tightly.
  • This leads to a minimized surface area because the molecules prefer bonding to each other rather than spreading out.
This cohesive force is so strong that it often outweighs other forces, like adhesive forces, that might occur if the surface were able to attract water molecules. This is why a droplet of water stays together on surfaces that don't bond well with water.
Teflon Surface
Teflon's surface is famously known for being non-stick, which is why it's commonly used in cookware. But what makes it non-stick? It's largely about its chemical structure, composed of carbon and fluorine atoms.
Fluorine has a knack for repelling almost everything, which includes water.
  • Water on Teflon doesn't spread because there's little to no adhesion between the molecules of water and the Teflon.
  • Teflon's low surface energy means it doesn't attract the high surface tension of water.
This combination means that water will form droplets on Teflon, displaying water's natural tendency to bond with itself rather than with Teflon. Hence, water on a Teflon surface prefers to stay in the tight, energy-efficient droplet form.

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