Soap water and pepper expiriment

Materials

1. Soap
2. Bowl of water
3. Pepper (powder)
4. Some fingers

How to do it

1. Take a bowl of water and put some powdered pepper over it.
2. Dip your finger into it 
3. Note down the observation 
4. Now dip your finger in soap water and repeat the same experiment
5. Note down the observation

What happens

1. When you dip your finger no change is noted
2. When you dip your finger in soap and repeat the same, the pepper moves away and their arrangement is broken

Why it happens

Soap breaks the surface tension of water. This causes the pepper to move away along with the water. That is why kit looks as if the soap repeals pepper.