**Correct Option: B. The droplet will take on a spherical shape to minimize surface area.** ### Detailed Explanation: 1. **Understanding Surface Tension:** - Surface tension is a physical property of liquids that arises from the cohesive forces between liquid molecules. In water, molecules are attracted to each other due to hydrogen bonding. This attraction creates a "skin" on the surface of the water, which resists external force and minimizes the surface area. 2. **Why Spherical Shape?** - When a small droplet of water is placed on a flat surface, the surface tension acts to minimize the surface area of the droplet. The shape that has the least surface area for a given volume is a sphere. Therefore, the droplet will naturally form a spherical shape to reduce the energy associated with the surface tension. 3. **Energy Considerations:** - The energy associated with surface tension is proportional to the surface area of the droplet. By forming a sphere, the droplet minimizes its surface area and, consequently, the energy associated with the surface tension. This is a fundamental principle in physics: systems tend to move towards configurations that minimize energy. 4. **Comparison with Other Options:** - **Option A: The droplet will spread out evenly to form a thin layer.** - This option is incorrect because while surface tension does allow for some spreading, a small droplet will not spread out evenly on a flat surface. Instead, it will form a shape that minimizes surface area, which is spherical, not a thin layer. - **Option C: The droplet will form a cube shape due to gravitational forces.** - This option is also incorrect. While gravity does act on the droplet, it is the surface tension that primarily dictates the shape of small droplets. A cube shape would not minimize surface area compared to a sphere, and thus is not a stable configuration for a droplet of water. - **Option D: The droplet will evaporate quickly without forming a distinct shape.** - This option is misleading. While evaporation can occur, it does not negate the formation of a distinct shape. A droplet will still take on a spherical shape before it begins to evaporate. The process of evaporation does not influence the initial shape formed by surface tension. ### Summary of Key Points: - Surface tension causes water droplets to minimize their surface area. - The shape that minimizes surface area for a given volume is a sphere. - Other shapes, like cubes or thin layers, do not minimize surface area effectively. - Gravitational forces do not dominate the shape of small droplets; surface tension is the primary factor. ### Revision Summary: - Surface tension leads to the formation of spherical shapes in small droplets. - Spheres minimize surface area, reducing energy associated with surface tension. - Other shapes (cubes, thin layers) are not stable configurations for droplets. - Evaporation does not prevent droplets from forming distinct shapes initially.