Black pepper experiments

By Menel BOUHLEL

Runaway pepper

Materials

Dish

Black pepper

Dish soapwater

You need only 4 things:

Procedure

Fill the dish with water

Sprinkle some pepper on water

Add several drops of dish soap in the center of the water

What happened ??

When the dish soap was added, pepper moved to the edge of the dish.

Explanation dish soap = surfactant

Surfactant possess an hydrophobic & hydropholic part.

The hydropholic part will be immersed in water,whereas the hydrophobic part will be turned outside.

Thus, the pepper is evacuated on the edge.

Besides, all the molecules of surfactant will get together.

Pepper steals

How will you make with a ball and the head of your neighbour for to get back all the pepper?

Materials

You need only 3 things

Black pepper White paper

A ball

Procedure

Inflate the ball and close him with a knot Rub him hardly on the hairy head of your choice Approach slowly the ball of the pepper

What happened ??

The pepper flies away and comes to stick to the ball.

Explanation When you rubb the ball on hair,

the ball tears away electrons from this head.

So, the ball will have a negative charge on its surface, because electrons are a negative charge.

Then, when you approach the ball to pepper, the negative charge of the ball will push away electrons of pepper.

So the pepper will have a lack of electrons, so it will be charged positively.

This time, there are two charges with opposite signs, that’s mean the pepper will be + and the ball will be – ,so they will attract themself.

Thank you for your attention !!