This was a blog I originally did for the lovely Darlene Beck-Jacobson that was originally posted in two parts – part one is here. I know summer is almost in full swing, so here’s some more ideas to keep your mind active over the school break . Check out Darlene’s blog here.
– Egg Geodes Experiment (from tinkerlab.com):
You will need:
- Rock Salt
- Sea Salt
- Other substance that could be tested for crystallization such as sugar, epsom salts, cream of tartar, baking soda, or alum*
- Mini-muffin pan
- Food Coloring
* Borax and alum are not food products, and using these ingredients with small children should be closely monitored, as ingestion can be fatal. Please use common sense and close supervision with such substances.
- Tap a knife around the top of the eggs to remove a bit of shell, and then empty the eggs and clean them with water. Using a finger, it’s important to gently rub around the inside of the egg to remove the membrane because the membrane can discolor crystals as they form.
- If you happen to have a mini-cupcake pan, it’s like they were made for this job.
- Heat a pot of water (not quite boiling) and then pour 1/2 cup into a mug. Add 1/4 cup of kosher salt into the first mug and mix it until it dissolves.
- In the next mug: 1/2 cup hot water + 1/4 cup sea salt. The sea salt dissolves quickly, so you may want to add a bit more. The idea is to saturate the solution without putting in too much of the dry ingredient.
- And then the final mug: 1/2 cup hot water + 1/4 cup borax. Dissolved.
- Add a couple drops of food coloring to each mug to differentiate between the solutions. Make a chart so you can keep track.
- Pour the liquid into the eggs. Each solution made just enough to pour into two eggs. Perfect!
- And then you wait. 5 days for the liquid to mostly evaporate. Salt crystals will start to evaporate through the egg shell to create the geode.
– Elephant Toothpaste (from navigatingbyjoy.com):
You will need:
- 6% Hydrogen peroxide (1/2 cup)
- Yeast (1 tsp)
- Hot water (2 tbsp approx) in a small dish
- Food colouring
- Washing-up liquid (dish soap)
- Empty soda/water bottle (small)
- Tray to stand the bottle on to catch the foam
- Funnel (optional)
- Pour the hydrogen peroxide into the bottle
- Mix the yeast into the water
- Add the washing up liquid and food colouring to the hydrogen peroxide in the bottle
- Add the yeast mixture to the bottle
- Stand back and admire the reaction!
– Oobleck! (from housingaforest.com): If you have never made it before, Oobleck is a mixture of cornstarch and water. When played with fast it acts like a solid…when allowed to relax it acts like a liquid.
You will need:
To make the oobleck: about 2 cups of Corn Starch to 1 cup of water
To make the oobleck dance:
- a Subwoofer
- a thin metal cookie sheet
- a MP3 of an audio test tone ~ you will have to play a bit to see what works best with your equipment.
- Food Coloring
- Place the cookie sheet onto the speaker of the sub, and pour in the Oobleck.
- You can download different test tones and play to see what works best for you. We used 40 Hz, 50 Hz, and 63 Hz, and found that we needed to turn the volume way up. We tried a number of different frequencies but these three seemed to work the best. We did a search for subwoofer test MP3. There are a number of different sites that you can use.
- Before you play the MP3 you will need to place your fingers on the edge of the cookie sheet with gentle pressure. It took a bit of playing to see what worked the best, but the results were amazing.
- We decided to add food coloring to see what would happen. I love how the colors dance together and you can see all the layers of each color. This was the kids favorite part!
Tips and Tricks:
- A thicker consistency of Oobleck works best. Although with that said you don’t want it too thick. We used a ratio of 2:1 (cornstarch to water).
- If your oobleck is not dancing, you may need to change the volume on your subwoofer. You can also try digging your finger in Oobleck to start the movement. In the video the kids do it a few times just to get everything started.
- Keep experimenting until you get it to work. Honestly we played around for a bit until it worked for us. Everyone will be working with different equipment so what worked for us might be a little different for you.
EVEN MORE fun science-y things can be found on these websites:
– lemonlimeadventures.com: blog from a mom passionate about being able to share her relatable successes and struggles with the world. There’s more than just science stuff here, but search the tag “Science Saturday” to pull up everything science-related.
– stirthewonder.com: activities and games for toddlers and preschoolers along with teaching tools for parents and educators
– pbskids.org/zoom: Site for the PBS Kids show, ZOOM, which features activities and games by kids and for kids. Also has resources for parents and teachers.
– fun-a-day.com: meaningful and fun learning activities for kids
– igamemom.com: games for learning for kids of all ages!
– learnplayimagine.com: outdoor activities, indoor activities, and so much more
– growingajeweledrose.com: blog with fun and educational activities for kids