Find colorful plant parts and rub them on paper.
Try some tests to see the similarities and differences between the fats in butter and oil.
See whether a diet or regular soda floats or sinks in water.
Use the protein in gelatin to make a model of the cartilage in your body.
Use your sense of touch and taste to discover the similarities and differences between regular and low-fat cookies.
Use an iodine test to see which foods contain starch.
Find electrolytes in different liquids with a buzzer, foil, and a battery.