Monday, July 31, 2017

The Magic Paper Towel: Exploring Water Repellent





a Rafflecopter giveaway


Back to school time is here with the TeachersPayTeachers.com sale. 

All items in my store are on sale.

Science demonstrations are a great way to wow your students the first week of school. 
Here is a fun one to spark their interest!

The Magic Paper Towel
We all know paper likes to absorb water. 
What if we make paper towel water repellent?
Watch the video to find out how to create water repellent paper towel!

1.   Place a piece of regular paper towel at each group.
2. Pour about 250ml of water slowly on each group’s regular paper towel.  Try to keep it on the paper towel.  Students will notice it absorbs the water and some most likely spreads.
3. Have students clean up their area.
4. Place a piece of water proof paper towel at each group.
5. Pour about 250ml of water slowly on each group’s water proof paper towel.  Try to keep it on the paper towel.  Students will be amazed to notice the water does not soak in.  It stays on top.  Even the bottom does not get wet.
6. Have the groups discuss what happened.  They need to try and figure out how the teacher did this.
7.  Then show them the water proof spray.
8. Have extra water proof paper towels to give students an opportunity to explore.

Why is this possible?


The paper towel was sprayed with silicone based water repellent.  Silicone is a hydrophobic substance.  That means it does not absorb water.  Paper towel is naturally hydrophilic (water loving).  Which means it absorbs water.  The water repellent creates a barrier keeping the water out.  Water forms curved drops on the paper towel because it has polar bonds.  Water molecules have a positive and negative end.  This means water molecules are attracted to each other.  The drops attract to each other forming raised droplets on the water proof paper towel.   This attraction creates surface tension.

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https://www.teacherspayteachers.com/Product/Science-Lab-Safety-and-Classroom-Management-Bulletin-Board-and-Lesson-Plans-2603149

 

30 comments:

  1. What a fun experiment and a great giveaway!! :)

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  2. Replies
    1. Thanks for commenting. Playing with water is always fun and it can be used at all grade levels.

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  3. I'm an SLP but an experiment like this would really help to elicit a lot of language from my kids! Thanks for the idea!

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    1. That is a fantastic idea. This will definitely get the kids talking.

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  4. Thanks! I could definitely use this with my 7th graders.

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  5. Always looking for fun demos to do in class, thanks!

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    Replies
    1. This one is lots of fun. It is something the kids will not expect. Thanks for commenting.

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  6. I love your water repellent paper towel experiment! This will be great to use with my students the first week back from summer break to get them to use their scientific observations abd inferences in groups!! Thank you for the experiment and for the chance to win a TPT gift card!

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    1. Thanks for commenting. Have fun doing this with your students.

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  7. Replies
    1. Thanks for commenting and participating in the giveaway. Anything with water is always fun.

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  8. I think the kids will love this and what a great way to demostrate hydrophobic and hydrophillic during the cell membrane. Also, thanks for having a giveaway! What fun!!!

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    1. I agree about the cell membrane. My husband works with silicone and finds it very tough to dose cells because the silicone is so hydrophobic. Thanks for commenting.

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  9. Replies
    1. Thanks for commenting and good luck in the giveaway.

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  10. Replies
    1. Thanks for commenting. It is really fun to see their reaction when the water doesn't absorb.

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  11. This is a neat experiment! It may be a bit high for my kiddos, but the rainbow milk one is always a class favorite! Thanks for the giveaway opportunity!

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    1. Rainbow milk is always fun. You can relate this to rainbow milk. Place the water on the water proof paper towel and then add a drop of soap. The water will flatten and some will absorb.

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  12. Love this experiment! Thanks for sharing!

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  13. Replies
    1. Thanks for participating. Good luck in the giveaway.

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