Which of the following best illustrates cohesion in water?

• A. A paperclip floating on the surface of water due to the water's surface tension.
• B. Water rising in a thin glass tube due to attraction between water and glass.
• C. Water molecules sticking together to form beads on a waxed car surface.
• D. Water droplets forming on a spider web due to attraction between water molecules and silk.

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the concept of cohesion in water. Cohesion refers to the attraction between water molecules due to hydrogen bonding. This property allows water molecules to stick together.
2. Step 2: Analyze the examples provided in the question. Look for the scenario that specifically highlights water molecules sticking to each other, rather than to other surfaces or materials.
3. Step 3: Eliminate options that describe adhesion, which is the attraction between water molecules and other substances. For example, water rising in a thin glass tube is an example of adhesion, not cohesion.
4. Step 4: Focus on the example where water molecules stick together to form beads on a waxed car surface. This illustrates cohesion because the water molecules are attracted to each other, forming a spherical shape due to surface tension.
5. Step 5: Confirm that this example aligns with the definition of cohesion and does not involve interaction with other materials, ensuring it is the best illustration of water's cohesive properties.