{Science} : Leakproof Holes

Written by Mommy Cameron | Homeschooling

A couple of weeks ago, I set up a series of different science activities for the boys to do.  I am just now getting around to blogging about the rest of them.

Leakproof Holes

Leakproof Holes

Supplies:
zip top bag
water
sharpened pencils

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Directions:
1.  Fill your zip top bag with water and make sure there aren’t any leaks.  Our first bag had a hole in it to start with.

2.  Take  pencil and slowly stick it into the bag, and out the other side.

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The bag should not leak.  This demonstrates some of the properties of plastic formed by polymers.  Polymers are molecules strung in long repeating chains.  The chain stretches around the pencil and then tightens around it, so the water doesn’t escape while the pencil is in place.

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The boys thought this was pretty cool and continued to stick pencils into the bag.  Then they thought it was fun to watch the water come out as they pulled the pencils out.

What fun experiments have you done lately?