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Egg Geode Science Fair 2013
Transcript of Egg Geode Science Fair 2013
Question: Does Alum powder, Borax, or salt make heavier crystals inside of eggs?
I wanted to do this project because I'm interested in chemistry, and growing crystals for science fair seemed like it would be a fun experiment.
Background Knowledge/ Research
Geodes made in nature can form in many places: In bubbles of volcanic rock, as well as in sedimentary rock. In volcanic rock, lava can often cool in the shape of a bubble. when water slowly seeps through the shell of the rock, it obtains mineral from the rock itself. This mineral-rich water will eventually filter out of the bubble, but it leaves minerals behind that slowly crystallize into what we know as geodes. Sedimentary geodes form in the same way that igneous geodes do, but the outside often appears to be a dull brown.
I grow crystals in eggshells,
borax will produce the heaviest crystals inside of the egg.
By: Trinity Briggs
Trinity Briggs, Period 3
3 cups or small containers
(optional) pot or large measuring cup
Paper/notebook (to record observations and results!)
Remove a small amount of the top of the eggshell. You want about 75% of the egg still intact. You can use a knife or other kitchen utensil if necessary.
Empty out the eggs, making sure to completely remove the thin membrane in the egg (without damaging the egg!)
Put your 6 eggs into the little cups in the egg carton, making sure that the opening you made in the egg is facing up.
Heat water in a pot or in the microwave, until the water is almost boiling, but not quite.
Carefully pour about ¼ cup of the heated water into your first container.
Dissolve the kosher salt into this container of water, dissolving as much of the salt as you can, until the water is saturated.
Put a few drops of food coloring, to your liking, into the mixture.
Set this first cup with kosher salt aside.
Pour about ¼ cup heated water into your second container, and mix in as much Borax as you can.
.Stir in the borax until the water is saturated. (As much Borax as you can dissolve in the water!)
Add a few drops of food coloring to your Borax mixture, using the color of your choice. Set the dyed Borax mix aside, With the dyed sea salt mix.
Pour the heated water into the third and final container, about ¼ cup, and mix in Alum powder, saturating the water. (mixing in as much as possible)
Add a few drops of food coloring the alum powder mixture.
Pour the dyed sea salt mixture into 2 of the emptied eggs, filling them about halfway. Dispose of any extra solution into a sink or garbage can.
Pour the dyed Borax solution into 2 more emptied eggs, also filling those about halfway. Dispose of any extra solution into a sink or garbage can.
Pour the dyed alum powder mix into two more eggs, filling those about halfway as well. Dispose of any extra solution into a sink or garbage can.
As a control, dye the remaining water and fill the last two eggs about halfway with what is hopefully the last of your heated water.
Wait 3-5 days for your eggs to begin growing their crystals. For my experiment, I waited 5 days in order to achieve full results.
With a gram scale, measure the weight of each egg.
Record your data!
It's ready to grow!
One day later...
Three days later...
The final day!
Average Weight (grams)
My Hypothesis was, "If I grow crystals in eggshells, then borax will produce the heaviest crystals." My hypothesis was not supported by the data. This is because salt ended up producing the heaviest crystals at an average of 19.5 grams as opposed to my hypothesis predicting Borax, which weighted in at 14.5 grams. In my experiment, I learned that salt can grow and crystallize very rapidly. I also learned that Alum powder is capable of producing crystals. My experiment was successful, as i was able to grow crystals with all three of my solutions. If i could change anything in my experiment, i would have weighed my egg shells before i filled them with the solutions. Now, I'm curious to see what other materials can become crystals.
Zeitner,June,Geodes: Nature's Treasures, Gem Guides Book Co. , April 30, 2006.
Ebner, Aviva, Experiments For Futere Scientists, Chelsea House Pub. , July 1, 2011.
Krampf, Robert, The Happy Scientist, 2013, 9/18/13, thehappyscientist.com/science-experiment-egg-geodes
Doorley, Rachelle, Egg Geodes Science Experiment, Tinkerlab, tinkerlab.com/experiment-egg-geodes