Exploding Lunch Bag: We combined warm water, vinegar and baking soda in a Ziploc bag. As soon as the bag was sealed shut it started to fill with air (carbon dioxide). Eventually, the Ziploc bag could no longer hold any more air so it popped. We learned that this is called an acid based reaction when you combine these two chemicals together.
Good/Bad egg experiment: We filled a bucket full of cold water dropping eggs in one at a time. Some eggs floated and some sank. We discovered that when an egg is laid by a chicken an air cell is formed inside the egg. As the egg gets older the air cell becomes larger and acts like a buoyancy. We talked about how this meant a good egg will sink and a bad egg will float. We cracked one good and one bad egg open to see the difference. The only difference we could see was that the yolk wasn’t as round in the bad egg as the good egg.