2A10.40-Surface Reaction

2a1040surface_reaction 2a1040surface_reaction_3 2a1040surface_reaction_2

Video: Watch this demo

Instructor’s video

Description: This demonstration shows what happens to the surface when you put a drop of soap in water.


  • Large glass container
  • Pepper
  • Soap
  • Overhead projector
  • Water

Setup Procedure:

  1. Fill the container with water and place on the overhead project along with the other supplies.

Demonstration Procedure:

  1. Turn on the projector.
  2. Sprinkle some pepper into the bowl and focus the overhead projector.
  3. Note that the pepper floats on the entire surface of the water.
  4. Put a drop of soap in the center and notice the pepper moves to the edges.

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