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2.Yes,we can get sand and water after they have been mixed. Since sand is not soluble in water so we can strain the mixture using a strainer.
3.Vinegar has, among other things, a chemical called acetic acid. Egg shells contain calcium carbonate. Calcium carbonate in the egg shell reacts with vinegar to form carbon dioxide (can be seen as bubbles in the vinegar).
4.If you soak eggshells in vinegar the eggshell will absorb the acid and break down, or dissolve. The calcium carbonate will become carbon dioxide gas, which will go into the air.
5. A irreversible change occurs.
hope its helpful(^_^)
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