CHEMISTRY EXPERIMENTS

Alvaro Figueroa Salas
6D

¿ HOW WORKS AN EXTINGUISHER?

It needs :
• Sodium bicarbonate placed in a paper napkin
• A perforated cork cork or Plasticine
• One straw to drink
• Bottle for small water (dry)
• Vinegar
• A little thread to sew

Assembly :
It puts 4 bicarbonate teaspoons in the napkin, closes and it moors with a thread in the form of bag (it must be well subject). It put 5 spoonfuls of vinegar in the bottle. It suspends the bicarbonate bag within the bottle so that it hangs (with a part of the thread it was) and it does not touch the vinegar. It takes the cork or Plasticine and it places straw in the mouth of the bottle.

Operation:
It shakes the bottle at the same time, covering with the finger straw and holding the bottle, to mix bicarbonate with the vinegar (without opening straw). It clears the finger and it projects the gas that leaves the bottle on an ignited candle

What happens?
The chemical reaction betweenbicarbonate (a base) and the vinegar (acid weak) forms carbon dioxide that fills the container and leaves by straw. As he is heavier than the air, when facing the ignited candle expels oxygen. Without it would call it to oxygen extinguishes

JUMPING BALLS

It needs :
• A container
•Naftalina
• Bicarbonate
• Vinegar

Assembly:
In a deep container with water balls of naftalina and two or three spoonfuls of bicarbonate are put. Water is added until filling the three quarters of the container and next, slowly, vinegar is added.

What happens?
Carbon dioxide bubbles form that adhere to the naftalina balls they help and them to float, ascending and descending.

TINTA INVISIBLE

It needs :
* Clear vinegar or lemon juice
* Paper
* A candle
* Wood of teeth
Assembly:
It takes wood from clients, it wets the end with lemon or vinegar and writes on a paper. Soon déjalo to dry and the message will become invisible. In order to see it again, it approaches the paper [continua]

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