Science Experiments over time.

Today we have set up some experiments that we will measure over time.
The first one is called the naked egg.
We placed an egg in a jar and filled it with white vinegar and we will observe what happens over the space of a week.
Initially we saw lots of bubbles on the eggshell so we assumed that the acid in the vinegar was dissolving the shell.

The second experiment is to look at bacterial growth.
We sliced some potato and placed them into zip lock bags.
Into bag 1 we placed a slice of potato that had been coughed on.
Into bag 2 we placed a slice of potato that had been rubbed on the floor.
In bag three we placed a slice of potato that had been rubbed on someone's hands.
Into bag 4 we placed a slice of potato with some flour.

I wonder what the slices of potato will look like after a week?
What would you expect to see?
Watch this space...