Fill a bowl with 2/3 cup of water and another bowl with 2/3 cup of cooking oil. Add three droplets of food coloring, without touching the other droplets, to both the water and the oil. Observe and record what happens. Pour 2/3 cup of water in a third bowl and top with enough cooking oil to create a thin layer on top of the water. Add three drops of food coloring to the water and oil mixture. Touch the droplets with a pencil point. Record observations about each bowl.
Stir 1/2 cup skim milk with 2 tbsp. of white vinegar and set aside for two minutes. It should form lumps called curds and liquid called whey. Strain the curds from the whey. Press the curds between sheets of paper towel to get all of the whey out. Combine the curds with two teaspoons of water and one teaspoon of baking soda to make glue. Listen to the mixture and you should hear popping. If a more glue like consistency is desired, add water, a drop at a time. Test out the glue and record your observations.
Make a prediction as to what will happen if you soak a penny in lemon juice. Put a dull penny in a paper cup and pour in enough lemon juice to completely cover the penny. Let the penny sit in the lemon juice for about five minutes. Remove the penny from the paper cup and rub it with a piece of paper towel. Record your observations and compare to your predictions.
Find a glass jar with a lid halfway with buttermilk. Screw the lid of the jar on very tightly. Shake the buttermilk in the jar for ten or fifteen minutes and watch the fat in the buttermilk cling to other pieces of fat to create butter. Shaking the jar vigorously will cause the liquid buttermilk and the solid butter to separate. Record your observations.