I spent an hour yesterday doing science with the girls at TXT2012 camp at Dakota County Technical College yesterday, where kids get to explore Technology, Science, Transportation, Health, Design, Technical/Industrial, and Business fields with hands-on projects. I showed them how to make a marshmallow slingshots (and talked about conservation of energy,) we talked about the fact that there are fun, safe experiments to do with kids you might be babysitting (with mom and dad’s permission, of course,) and then we played with red cabbage juice, and talked a little about pigments, flavenoids and anthocyanins. Finally, we did a hands-on chemical reaction using the cabbage juice, vinegar and baking soda.
Here are the experiments I demonstrated and mentioned: Marshmallow Slingshots, “Magic Potion” (Red Cabbage Juice chemical reaction,) Homemade Litumus Paper, CO2 breath test with red cabbage juice
and here are some fun, safe experiments for babysitters that can be done (under supervision) with young children: Tie-Dye Milk, Cornstarch Goo. If you have an iPhone or iPod Touch, these experiments are on the free (and Premium) version of KidScience app, so you can have them with you all the time.
You can take this project in many different directions, which is what science is all about! Chances are, you already have all the supplies you need for this project in your kitchen: coffee filters or paper towels, magic markers, and water.
Fill the bottom of a bowl or glass with a little water. Then, cut paper towels or coffee filters into long strips. Draw a large dot of color (black works best) about an inch from the bottom of the strip of paper. Place the bottom of the paper, below the dot, into the water. Once the water starts moving, the paper will stick to the side. You can hook it over the top of the glass, like we did.
The water will be wicked up the paper and through the dot, dissolving and taking some of the dye up the strip with it. You’ll be able to see colors separate as the dyes travel up the strip. It’s fun to see what colors make up different black inks. My kids tried it with colors other than black too. They even made dots comprised of several different colors and watched them separate in the water. Another variation is to put ink on a large piece of paper, drip water on it from a dropper or straw and watch the color travel out in a circle!
We taped some of the strips into our science notebooks. They’re very colorful. Older kids might enjoy trying a 10:1 mix of window cleaner and vinegar to separate the colors.
When you separate the colors from one another on the paper, you’re doing chromatography!
When paper is dipped in water, water molecules make it wet. The water molecules travel up the paper towel. When the water reaches the ink, it dissolves some of the dyes in the ink, and the dyes travel up the paper towel with the water. Some of the molecules that make up the dye are smaller and travel up the paper towel faster than the larger ones, so you can see some of the different colors that make up the ink separate from one another. The number of spots of color you see can tell you how many chemicals make up the color in your marker.
Most importantly, have fun!
Our school’s Imagination Fair is one of my kids’ favorite events of the year. I love it too. One of the best things about this gathering is that it is not a competition. I also love that there are no rules and guidelines. My kids spend their days following rules and competing against others, whether it is in school or in sports. For the Imagination Fair, kids simply create, demonstrate, or show off something that interests them and then have a great time walking around and checking out everyone else’s projects.
Sugar cube castles towered over posters about magnets, and jars full of home-grown crystals stood next to Lego creations. There were plastic sharks wired to foam board, a cardboard reproduction of the Olympics half-pipe and a poster about money of the world. You could pet a bunny or “test your knowledge” to win a sucker. My four-year old especially loved the circut table, where one boy had inventions that spun and beeped when you made electrical connections.
I’m thinking of putting an “Imagination Fair” together this summer, in my back yard, for the neighborhood kids. What better way to let kids be kids?
Fill the jar about halfway up with water and add a few drops of food coloring for contrast. Add about half as much vegetable oil to the jar and watch it float to the top. Now, a spoonful at a time, add salt to the jar. The salt will pull some of the oil down with it, but will release the oil as it dissolves and the oil will float back to the top. This will make your science experiment look like a real lava lamp. Keep adding salt to make it keep working. Now, try adding sugar or even sand. Kosher salt worked really well!
What worked the best for you? Do you know why oil floats to the top of the water? Email me your answers in the comments section of this post for a chance to win a KITCHENPANTRYSCIENTIST.COM tee shirt (size M.) I’ll do a drawing for a winner in two weeks! Thanks to PBSkids/DragonflyTV’s website for this fun idea. Check out their website for more great kids’ science!
Kids from two to twenty will have fun playing with this science project. Click here for my blog post on Tie-Dye Milk and to read more about surface tension
For this project, I thought that it would be fun to mix a little science and a little art. My sister told me that she heard you could make Valentine’s cards using fingerprints. I’ve also heard that it’s pretty easy to lift fingerprints using scotch tape, so I thought we’d give it a try. All you need for the science part is paper, scotch tape and a pencil. For the valentines, you will need an ink pad, paper and markers.
On www.wikieducator.org/Fabulous_Forensic_Fingerprints, I found a fingerprint-lifting technique that works well, even for very young children. Simply take a pencil and scribble on a piece of paper until a small area is covered with the graphite from the pencil lead. Have your child rub his or her finger around in the graphite until it is covered with gray. Then, have your child carefully place their finger on the sticky side of a piece of scotch tape and carefully lift their finger off of the tape. A clear fingerprint should be visible. Place the tape face-down on another piece of paper to preserve the fingerprint.
Your child can then inspect the fingerprint under a magnifying glass, or just with their naked eye. If you go to the wiki website I mentioned, your child can decipher whether they think their fingerprint is a whorl, a loop, or an arch. It is fun to have them trace their hand, fingerprint each finger and thumb, and tape their fingerprints to the appropriate fingers. Your child’s fingerprints would be a great addition to their science notebook! I’ve found that their notebooks are great keepsakes of their drawings and observations at different ages. The kids had a lot of fun with this project and could do it unassisted once I showed them what to do.
For the Valentines, have your children put two fingerprints or thumbprints together in the shape of a heart. Of course, they will also want to make fish, bugs, and who knows what else? I gave my kids some ideas to get them started and they went from there! (It’s fun to add details with markers.) Have fun!
What could be more fun than creating your own green slime to play with? It’s easy to synthesize your own green goo using only Elmer’s glue (the non-washable kind), Borax (found in the laundry detergent section of most stores), green food coloring and water.
In a bowl, have your child mix together about 1/3 cup glue and 1/3 cup water with a spoon or Popsicle stick. These measurements don’t have to be exact. Add a few drops of green food coloring and mix well.
To make the Borax solution, add around a cup of water to a jar. To the water, add about a Tablespoon of Borax. Have your child shake the jar to dissolve as much of the Borax as possible. You are making what is called a saturated solution, so it may not all dissolve! Don’t worry, it will work just fine.
Have your child add about a teaspoon at a time of the Borax solution to the glue/water mix. After each addition, have them stir the mixture together. You should see long strings begin to form and stick together. Keep adding Borax until the mixture doesn’t feel gluey any more. It will form sort of a shiny playdough-like substance. If you add too much Borax solution, it will feel wet. You should be able to just knead it a little to absorb the extra water! The slime is not toxic, but Borax is soap, so don’t let your kids eat it!
I am a biologist and not a chemist, but here is the science, as I understand it.
Mixing Elmer’s glue with water forms a substance called a polymer, which is a long chain of molecules. (A molecule is the smallest amount of a specific chemical substance that can exist alone, like H2O, a single water molecule). The polymer formed by water and glue is called polyvinyl acetate.
The Borax solution (sodium tetraborate) is a cross-linking substance that makes the polymer chains stick together. As more and more chains stick together, they can’t move around and the goo gets thicker and thicker. Eventually, all the chains are bound together and no more Borax solution can be incorporated.
You can store the slime in plastic bags. If you want to make a larger batch, just remember to mix equal amounts of glue and water and add as much Borax solution as needed.
To make your child feel like a “real” scientist, find an old, button up shirt for your child to use as his or her “lab coat”. It’s fun and will protect their clothes. You could even try to find some old safety goggles in your garage for your child to wear, although the ingredients for this project are relatively safe. (Very young children should always be supervised while doing science projects.)
Here’s a fun, easy science project that I discovered a few years ago on pbskids.org/dragonflytv. My children will do it again and again. Even my three year-old joined in, cutting up construction paper into “fish food” and throwing it into the water.
You will need some sort of pan for water (a cake pan will work), construction paper, scissors, and dish soap. Have your child cut out some fish shapes from the paper (around two inches long works well.) See the photo below. Then, have them cut a small slit in the back of the tail. Put a few inches of water in the pan and add the fish. Before the paper soaks up too much water, have your child add a drop of dish soap behind the fish. The fish should zoom across the water. You will have to add fresh water tothe pan if you want to repeat the experiment.
The soap breaks the surface tension of the water. Tell your child to imagine that the surface of the water is a sheet of fabric and the soap is a pair of scissors. The soap cuts through the water, pushing the fish ahead of it. For a more scientific explanation, have your child look up surface tension or visit the dragonfly tv website!
Don’t forget those science notebooks! Have your children write the date, “surface tension” and record their results. They can try using different liquids (like lemon juice) to see if they will break the surface tension. My kids made some fish out of that foam that is used for craft projects so that they wouldn’t soak up the water! Hopefully, the zooming fish will keep your child interested and busy for a while! Click here to see a video on how to make zooming fish.
This experiment is easy, non-toxic and so much fun that it is worth every bit of the mess it makes. Your kids will love it!
All you need is a cup of cornstarch and half a cup of water with a little food coloring in it (purple and green and red would be gross!) Mix the two ingredients to a medium-size bowl with a spoon or your fingers. The goo should be the consistency of syrup.
Now, play with the mixture! You will discover that it behaves like a solid when you agitate it, or move it quickly, and like a liquid when you let it sit still. Pour some onto plates or into bowls if you want to. We poured it directly onto our table which was pretty messy, but lots of fun! Hold a handful on your palm and watch it drip between your fingers! Roll it into a ball. If it gets too dry, just add a little more water. You can easily clean the goo off of flat surfaces using a plastic spatula. Wash it off hands with water.
Cornstarch molecules are like long ropes. When you leave them alone, or move them slowly, they can slide past each other and look like a liquid. However, if you squeeze them, stir them or roll them around in your hands, the ropey molecules look and feel more like a solid. Materials like cornstarch goo are known as non-Newtonian fluids, since they don’t have the normal properties of either a liquid or a solid.
Click here to watch my video on how to make cornstarch goo.