My Science Experiment: "The Leak Proof Bag"

2nd Grade Activity 

ALCOS-Science: 1. Learning to describe objects according to physical properties, including hardness, color, and flexibility.  

Materials:

A few paper towels

Plastic Ziploc bag

5 Sharpened pencils with rounded edges

Water   

                                                        

Preparing for my science experiment

Placing the pencil in the Ziploc bag filled with water

Ta Da!!! The Leak Proof Bag

Scientific Explanation: 

The Ziploc bag is made out of long chains of molecules called polymers. This gives the bag its stretchy properties. The sharpened pencils slips between the molecule strands without tearing the bag.  The long chains of molecules seal back around the pencil to prevent leaks.