So the egg shell on both the control egg and the fluoride egg were completely dissolved in the vinegar after a couple weeks. The membrane was still intact so the eggs still maintained their egg shape. First graders being first graders wanted to poke the egg to see what it was like inside after they had a chance to feel how soft and springy it was to the touch. So of course we did! We found that the egg inside looked just like a normal egg when you crack it open. The yolk was intact too. Sooo cool! The delicate membrane was more protective than the hard shell. BUT that wasn't all. Then we looked at the cup that had water and table salt in it. The water had evaporated sitting in the window. The salt remained, but...it was above the line where the water had been. How did it happen? We decided the salt must have been deposited there as the water slowly evaporated. But the best observation we made (I have never seen this myself)was that in the bottom of the cup, there were cube-shaped chunks of salt. How did it happen? There were literally cubes and we only used table salt. Did you notice that every time we get an answer, we get more questions? Scientific investigation is sooo much fun, and an amazing avenue for learning. I LOVE it and so do the students.
So the egg shell on both the control egg and the fluoride egg were completely dissolved in the vinegar after a couple weeks. The membrane was still intact so the eggs still maintained their egg shape. First graders being first graders wanted to poke the egg to see what it was like inside after they had a chance to feel how soft and springy it was to the touch. So of course we did! We found that the egg inside looked just like a normal egg when you crack it open. The yolk was intact too. Sooo cool! The delicate membrane was more protective than the hard shell. BUT that wasn't all. Then we looked at the cup that had water and table salt in it. The water had evaporated sitting in the window. The salt remained, but...it was above the line where the water had been. How did it happen? We decided the salt must have been deposited there as the water slowly evaporated. But the best observation we made (I have never seen this myself)was that in the bottom of the cup, there were cube-shaped chunks of salt. How did it happen? There were literally cubes and we only used table salt. Did you notice that every time we get an answer, we get more questions? Scientific investigation is sooo much fun, and an amazing avenue for learning. I LOVE it and so do the students.
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