Monday, April 25, 2011

Egg Experiments


Don't throw your Easter eggs out yet!
Here are bunch of cool little experiments that you can do with them.

Experiment No 1 - Sink or Float

Fill one glass with regular water and a second glass with water and about 4-5 tbsp of salt {kosher salt will not turn the water cloudy, but you could use table salt too}.
Grab two of your hard boiled egss {you can can also use raw} and ask the kids what they think will happen to the eggs in each glass.
The egg will sink in the plain water and float in the salt water {since the salt in the water makes it more dense, it will be able to hold up the egg}.

You can also fill a glass half full with the salt water and slowly add plain water.  Add the plain water by pouring it gently onto a spoon and letting it fall down the side of the glass so you don't mix the salt and regular water.  Then gently drop your egg into the glass - it will sink down through the regular water and then stop when in hits the more dense salt water.
{I think I mixed the two solutions in our experiment because the egg stopped very close to the bottom of the glass}

Experiment No 2 - Folding Egg

Place one of your blown out Easter eggs into a glass of vinegar.  Either hold it under the vinegar until it fills and will stay submerged or use something to weigh it down.  The vinegar will start to dissolve the shell and leave only the membrane.  The experiment {found here} says this will take up to 10 days.  We must have super vinegar because our egg shell started to crack a bit from the spoons I placed on it to hold it down.  I was easily able to peel off the shell from the membrane within a few hours!  With a little bit of air {we used a syringe to fill it with air} you have an egg shape that you can fold, squeeze and fool others with.  It didn't work nearly as well as I thought, but it was still neat for the kids to feel the texture of the egg membrane.

Have fun with those eggs!

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