Category: science projects

Density Ornaments – Science Plus Holiday Art!

By , December 12, 2016 7:33 pm

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We decorated our Christmas tree this evening.  During the process, someone found a long lost box of empty glass ball Christmas ornaments that they sell at craft stores. They are the kind that you can fill with whatever fun things you want.

One of the kids had the idea of filling them with colored water.  This evolved into water plus other stuff. Finally, the project transformed into a density column idea where liquids of different densities are added and then separate out into colorful layers.

Colored water was pretty (especially with a little soap):

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Then one of the kids thought of the layers of differing densities in a density column and wanted to try that!  They put all the ingredients we had on hand in different little bowls (honey, light corn syrup, water, canola oil, and green dish soap).  NOTE: Steve Spangler has a great density column project that lists ingredients you can use.

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We did not have a funnel, so we used a large kid’s medicine dropper and a cool syringe-type device that my oldest daughter was given when she had her wisdom teeth out (a baby medicine syringe would work too). They both worked really well.

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Honey, corn syrup, and oil with a few drops of food coloring in the oil produced some cool, elevated, lava lamp-style blobs:

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The ornaments are too heavy to hang on a Christmas tree, however they make a pretty and very unusual centerpiece!

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Super Fun with the Supermoon

By , November 15, 2016 9:09 pm

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Image: By Gregory H. Revera (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons

 

Have you and your family been moongazing the last few nights to see the “Supermoon?”  Last night the moon was at its closest point to Earth since 1948 and it appeared 15% bigger and 30% brighter than usual.

We went outside to check it out.  This time we didn’t lie on the golf course wondering about the timing of the sprinklers, but we did stand in the driveway to get a good look at the moon as it rose over the mountain.  I felt I could see detailed lunar features without binoculars or a telescope (and I can’t even see what is right in front of me without glasses anymore!) but I think the incredible brightness was what struck us the most.

If your kids are moon-crazy now, here are a few moon-related resources and educational ideas that might be just the ticket to feed their interest:

 

Educational Experiments and Activities

  • Oreo Moon Phase Match Game (with free printable template) from Simply Learning: A fun matching activity to learn about the phases of the moon, plus kids can eat their work when they are done. What could be better?
  • How the Moon’s Craters Form: An easy activity involving flour and a weighted plastic Easter egg teaches how the moon’s craters are formed.  For older kids, the activity also involves experimenting with the different factors that determine the size of lunar craters, and recording the data.  There is even a free printable data collection worksheet.

 

Books

(By the way, Kitten’s First Full Moon is one of my very favorite picture books EVER!)

Pumpkins

By , November 11, 2011 6:07 pm

It’s fall and a perfect time to study pumpkins!

First I read the class Pumpkin Circle: The Story of a Garden by George Levenson and Shmuel Thaler, a lovely book about the life-cycle of a pumpkin.  The photos in this book are gorgeous.  We talked about the circularity of life.

Next I cut open a pumpkin at school and had the children identify the rind, the pulp, the stem, and the seeds.  We then made little Montessori “Parts of the Pumpkin” books.

I explained to the children that we would not waste our pumpkin and we would be eating the pulp and the seeds.  Several of them seemed somewhat aghast at the prospect.

I roasted the seeds in the oven at school so the children could enjoy the lovely smell and hopefully be more encouraged to try them!  Only one child out of a class of twenty-five did not wish to try one, and of all those who tried, only two did not clamor for seconds and thirds.  This was a huge hit!

I took the rest of the pumpkin home and made pumpkin bread with the pulp.  That will be going to school tomorrow and I think all will enjoy it.

In the interest of scientific research we put some of the pulp and a few seeds in a tightly sealed jar.  I labeled it with the date and placed it on the science shelf.  I asked the children to predict what, if anything, would happen to it.  A few predict it will stay exactly the same forever.  A few said it would grow mold.  I told them to inspect it every day to see for themselves.

(Next year we might try this clever version of the decaying pumpkin experiment!)

We also cut the top of a second pumpkin and filled it with dirt.  We watered it and set it in a sunny window to see if the seeds would grow.  I’ll report back on the results.

NOTE (added March 4, 2012):  This turned out wonderfully!  Please see the next post, What We’ve Been Up To for details and a photo of it now!

I dyed some pumpkin seeds red, orange, yellow, and green and set them out in bowls on a tray with some black construction paper.  They have been making pictures and designs with them.

Finally, I put this simple pumpkin color-by-number on the shelf along with a laminated completed one to use as a guide.   It has been popular.

(Oh, and we also painted pumpkins at our school’s annual Fall Festival!!)

 

Sources

Growing in Pre K – Post: Pumpkins

 

Recipes

ROASTED PUMPKIN SEEDS –

Rinse the seeds thoroughly and remove all pulp and strings.  Spread them out and let them dry on paper towels.  Put in the seeds in a bowl and add just a TEENY TINY bit of olive oil to make the seasonings stick (not too much, or they will be greasy).  Toss to coat them in oil, then add seasonings and toss again.  I use Jim Baldridge’s Secret Seasoning (yum!) but you can use anything you like, even just salt.  Some people do cinnamon and sugar, however I like mine savory and have never tried this.  Spread them on a cookie sheet lined with parchment paper. Try to spread evenly so very few overlap.  Bake in a 250 degree (Farenheit) oven (this is fairly low heat for those who do not use Farenheit).  Check them after 45 minutes, but they might take an hour to an hour and a half at this temperature to be done.  They are done when crispy seeming and crunch loudly when bitten.  NOTE: They might not brown much, but as long as they crunch, that is OK!

PUMPKIN BREAD –

Ingredients :

  • 1 and 2/3 cups all-purpose flour
  • 1 teaspoon baking soda
  • 3/4 teaspoon ground cinnamon
  • 1/4 teaspoon ground ginger
  • 1/4 teaspoon ground cloves
  • 1/4 plus 1/8 teaspoon kosher (ie. course) salt
  • 1 and 1/3 cups sugar
  • 1/3 cup canola oil
  • 1 cup plus 1 and 1/2  tablespoons canned, unsweetened pumpkin (or fresh pumpkin pulp that has been boiled, or roasted in water and removed from the skin)
  • 1 large egg

Preheat oven to 350 degrees (Farenheit, a medium setting for those who do not use Farenheit).  Grease and flour an 8.5 x 4.5 inch loaf pan.  Sift together first 5 ingredients then stir in kosher salt.  Combine sugar, oil, and pumpkin in a large bowl.  Beat at medium speed with an electric mixer until smooth.  Add egg, beating until well-blended.  Gradually add dry ingredients, beating at low speed until blended.  Pour batter into pan.  Bake for about 1 hour and 5 minutes or until loaf is golden and a wooden pick inserted in the center comes out clean.  (NOTE – I start checking on it early.  It will be dry if you over-bake.)  Let cool in pan on wire rack for 15 minutes, then remove from pan.  Serve warm or at room temperature.

Fireworks in a Dish

By , March 6, 2011 4:35 pm

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If you have milk, food coloring and dish washing soap on hand…

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you can have impressive rainy-day science fun!

Pour some milk into a plate:

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Wait a minute for any motion in the milk to settle down, then add four drops of different colors of food coloring.  Place the drops next to each other near the center of the plate.

 

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Wait a minute or so until the colors get a bit blotchy-looking:

 

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Take a clean cotton swab and gently place it on the colors.  What do you think will happen?

(SPOILER ALERT:  Absolutely nothing.)

Now put a drop of dish soap onto the other, clean and dry end of your swab.

 

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What will happen when you put the soapy swab gently onto the colors?  Look!

 

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It even continues impressively swirling and churning after you have lifted the swab out of the milk!

 

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Try putting your swab in different areas of the plate to see what new patterns form.

 

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NOTE:  It is very important not to stir, just hold your swab still in the milk.

Make sure you have plenty of milk and food coloring on hand for this because your kids won’t want to do it just one time.  This kept my 5 year-old entertained for at least an hour!

 

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Many thanks to Steve Spangler’s Science Experiments for this really fun idea! Steve Spangler has a good explanation of the science behind this colorful display. You can read it here.

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This is my contribution to this month’s Unplugged Project theme of soap.  Can you come up with a soap-themed project?  If so, please join in and add a link or comment to the original project post.  You can read more about the Unplugged Project here!

Magic Expanding Hand!

By , February 26, 2011 7:50 pm

Here is a fun science experiment that will totally entertain your kids AND teach them a bit of chemistry. Great rainy day educational fun!

  • INGREDIENTS:  All you need is vinegar, baking soda, and a latex glove. (Baking soda and vinegar happen to be my very favorite toys!

    You probably have the baking soda and vinegar in your pantry already, all you need to find is the glove (think hospital, doctor, dentist, lab…). We had a cool purple one. If you can’t find a glove, how about a balloon Magic Expanding Head?  This would be even more funny if you drew a face on the balloon first.

  • HOW:  Pour some baking soda into the glove,then carefully pour in some vinegar.

    You can be scientific and test which proportions work best, or just “wing it” like we did (about 1/3 cup baking soda, and 1/3 cup vinegar) . Squeeze the glove tightly closed with your fist, or if you work fast you might be able to tie the wrist up like a balloon. The glove will rapidly “grow” into a giant-sized hand (shake if necessary).

  • TIP:  Pouring in the vinegar is the tricky part since you might have to work fast to close off the opening of the glove before a geyser occurs in your kitchen. Although I know from experience that children are extremely impressed by the geyser-effect, you will be less so. Unless you are a Way-Cooler-Mom than I am, I recommend working quickly and conducting this experiment over a sink, or better yet … outside!
  • LESSON:  The quick answer is that the baking soda and the vinegar, when mixed, recombine to form Carbon Dioxide gas (CO2) and water (H2O).  It is the gas that fizzes, bubbles and expands the glove.  (A more complete explanation can be found here.  And an even more thorough and lengthy one here.)

You can also perform a version of this using a balloon stretched over a bottle or a jar.

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