The the pepper spreads out over the surface of the water.
Why does the pepper spread out?
The detergent spreads out over the surface of the water and reduces the surface tension of the water but, more importantly, the non polar end of the detergent molecules interacts with the pepper, spreading it over the surface. 4. Support a piece of window flyscreen over a pan or bowl. Slowly pour water onto the screen. What happens?
Plain water will bead up on the screen.
Why is it hard for the water to go through the screen?