Quimica 1

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  • Publicado : 13 de abril de 2010
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INTRODUCION

Polymer Balls is a new recent innovation. We all know that balls have been toys forever, but now the polymer balls (bouncing ball) were originally made of naturalrubber, though now bouncing balls can be made of plastics and other polymers or even treated leather. You can use chemistry to make your own bouncing ball. Once you understand thebasic technique, you can alter the recipe for the ball to see how the chemical composition affects the bounciness of the ball, as well as other characteristics.
The bouncingball in this activity is made from a polymer. Polymers are molecules made up of repeating chemical units. Glue contains the polymer polyvinyl acetate (PVA), which cross-links toitself when reacted with borax. The purpose of this activity is to see the making of a polymer.

Doing the scientific method we have to follow a procedure to make a bouncing ball,then varying the procedure and our observation we will know about the effects of the changes.
The ball can be sticky and the balls diameter can be wrong, the difficult thing issee how long it takes to solidify into a ball and how high it bounces.
Adding more cornstarch will make a ball that stretches and bends & using less borax will produce a goopiertype of ball, If you want a slimier ball add more glue.

MATERIALS
• borax (found in the laundry section of the store)
• cornstarch (found in the baking section of the store)• white glue (e.g., Elmer's glue - makes an opaque ball) or blue or clear school glue (makes a translucent ball)
• warm water
• food coloring (optional)
• measuring spoons
•spoon or craft stick to stir the mixture
• 2 small plastic cups or other containers for mixing
• marking pen
• watch with a second hand
• metric ruler
• zip-lock plastic baggie
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