Egg Experiments

As you know, we have been focusing on eggs for the past two weeks. We were learning about oviparous animals (animals that hatch from eggs).  We decided to do two experiments with eggs.  In the first experiment, we took 3 hard boiled eggs and placed one in a glass of water, one is a glass of apple juice and one in a glass of coca-cola.  We made prediction about what might happen to the eggs.  Some thought the eggs might crack, some thought they would change colour, and some thought they might explode.  We left them for 24 hours and checked them the next day.  This is what we found...

This is the egg left in water.  It still looks the same.

 This is the egg left in coca-cola.  It is stained brown.  

 This is the egg left in apple juice.  It is also stained and discoloured.

After examining the eggs we talked about the importance of brushing our teeth.

In our second experiment, we placed a raw egg into a glass of vinegar and left it for 24 hours.  We again made predictions about what would happen.  Some thought nothing would happen, some thought the vinegar might evaporate and some thought it might crack.  When we checked it this is what we found.

What we found appeared to be a "rubber" egg. It was very soft and squishy.  The vinegar reacts with the calcium of the egg shell and forms a gas which makes it appear like a rubber egg.  It is very similar to the egg laid by reptiles.