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Chapter 9: Problem 44

Explain why water forms into beads on a waxed car finish.

Short Answer

Expert verified
In short, water forms into beads on a waxed car finish because of the surface tension of water molecules and the hydrophobic nature of the waxed surface. The wax layer repels water, causing the water molecules to bead up instead of spreading out. This beading effect helps protect the car's finish from water spots, dirt, and contaminants.

Step by step solution

01

Understand surface tension

Surface tension is a property of liquid surfaces that results from the cohesive forces between the liquid's molecules. In water, the hydrogen bonding that occurs between water molecules creates surface tension. This force causes water to minimize its surface area and form into small beads or droplets when it's not in contact with other surfaces.
02

Learn about hydrophobic surfaces

Hydrophobic surfaces are those that repel water. When a material is hydrophobic, it doesn't interact well with water, and the water molecules are more attracted to each other than to the material. This causes the water to form beads rather than spreading out on the surface.
03

Examine the interaction between water and wax

Wax is a hydrophobic substance, meaning it repels water. When a car is waxed, a thin layer of wax covers the surface of the car's finish. This makes the surface hydrophobic, and subsequently, water does not spread or cling to the surface. Instead, the water forms into beads due to the surface tension and the hydrophobic nature of the waxed surface.
04

Understand the role of water beading in protecting the car finish

The beading of water on a waxed car surface helps protect the finish in several ways. First, it prevents the water from spreading and drying on the surface, which reduces the risk of water spots and streaks. Second, it makes it harder for dirt, dust, and other contaminants to adhere to the surface, which can help keep the car looking cleaner for longer. Finally, the hydrophobic surface helps the water to roll off the car more easily, taking dirt and contaminants with it and further preventing damage to the car's finish.
05

Summarize the explanation

In conclusion, water forms into beads on a waxed car finish due to the surface tension of the water molecules and the hydrophobic nature of the waxed surface. The wax repels the water, causing the water to form beads, which can help protect the car's finish from water spots, dirt, and contaminants.

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