1 Place the egg carefully in the bowl. 2 Fill the bowl with vinegar so that the egg is completely covered. 3 Leave it for 2 to 3 days. As soon as you pour the vinegar into the bowl, bubbles start appearing on the surface of the egg. The bubbles are carbon dioxide gas, and you’ll notice that lots more will appear with time. After about 2 to 3 days, most of the eggshell will have dissolved but the membrane of the egg remains. Gently lift the egg out of the bowl and wipe away any pieces of shell that are left. Hold the egg up to a bright window. You can see the yolk as a dark blob inside. Turn the egg upside down. Can you see the yolk sinking to the bottom of the egg? You have used science to remove the eggshell without breaking the egg. What an egg-cellent experiment! The vinegar and the calcium carbonate in the eggshell have reacted just like the vinegar and the baking soda in the previous experiment. Chalk also contains calcium carbonate. You should try placing a piece of chalk into a bowl of vinegar. What do you think happens to the chalk?

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