Black pepper and dish soap experiments2

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Black pepper and dish soap experiments2

  1. 1. Black pepper experiments By Menel BOUHLEL
  2. 2. Runaway pepper
  3. 3. Materials Dish Black pepper Dish soap water You need only 4 things:
  4. 4. Procedure <ul><li>Fill the dish with water </li></ul><ul><li>Sprinkle some pepper on water </li></ul><ul><li>Add several drops of dish soap </li></ul><ul><li>in the center of the water </li></ul>
  5. 5. What happened ?? When the dish soap was added, pepper moved to the edge of the dish.
  6. 6. Explanation <ul><li>dish soap = surfactant </li></ul><ul><li>Surfactant possess an hydrophobic & hydropholic part. </li></ul><ul><li>The hydropholic part will be immersed in water, </li></ul><ul><li>whereas the hydrophobic part will be turned outside. </li></ul><ul><li>Thus, the pepper is evacuated on the edge. </li></ul><ul><li>Besides, all the molecules of surfactant will get together. </li></ul>
  7. 7. Pepper steals
  8. 8. How will you make with a ball and the head of your neighbour for to get back all the pepper?
  9. 9. Materials <ul><li>You need only 3 things </li></ul>Black pepper White paper A ball
  10. 10. Procedure <ul><li>Inflate the ball and close him with a knot </li></ul><ul><li>Rub him hardly on the hairy head of your choice </li></ul><ul><li>Approach slowly the ball of the pepper </li></ul>
  11. 11. What happened ?? <ul><li>The pepper flies away and comes to stick to the ball. </li></ul>
  12. 12. Explanation <ul><li>When you rubb the ball on hair, </li></ul><ul><li>the ball tears away electrons from this head. </li></ul><ul><li>So, the ball will have a negative charge on its surface, </li></ul><ul><li>because electrons are a negative charge. </li></ul><ul><li>Then, when you approach the ball to pepper, </li></ul><ul><li>the negative charge of the ball will push away electrons of pepper. </li></ul><ul><li>So the pepper will have a lack of electrons, </li></ul><ul><li>so it will be charged positively. </li></ul><ul><li>This time, there are two charges with opposite signs, </li></ul><ul><li>that’s mean the pepper will be + and the ball will be – , </li></ul><ul><li>so they will attract themself . </li></ul>
  13. 13. Thank you for your attention !!

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