The soda experiment demonstrates which type of soda is the most corrosive and thus, most harmful to dental health. First, form a hypothesis. For example, if the soda is dark then it will be worse for your dental health. For this experiment, gather one bottle each of Coke, Pepsi, Dr. Pepper, Sprite, Mountain Dew and distilled water. You also need six plastic cups, six tarnished pennies, a journal, measuring cup and permanent marker. Fill each plastic cup with one cup of each liquid. Label each cup. Drop one penny in each cup and observe the tarnished pennies. The penny in the distilled water will be the control for each cup of soda. At the end of one week observe which penny is the cleanest. This is your most corrosive soda.
Another science fair experiment that combines several controlled experiments into one is identifying what materials and objects magnets attract. By performing a series of controlled experiments, students will create one experiment with one hypothesis and one outcome. Again, your first step will be to create a hypothesis. Gather a strong magnet and different materials. For each object, observe whether or not the magnet is attracted to it. After all materials have been tested in a controlled environment, the magnet being the control, the conclusion should be fairly obvious.
Many people are plagued by allergies. There are several different types of allergies and hundreds, if not thousands, of things that can cause allergies. One common allergen is dust mites. In this experiment, students will find the best way to get rid of dust mites. Form a hypothesis about the best way to rid material of dust mites. Gather five dust mite infected pillow cases, tap water, a strong magnifying glass, black marker pen and ruler. Your controls will be the size of the marked area, the type of pillow case, the hot water temperatures and the cold water temperatures. Label the pillow cases, one through five. Mark a 2 inch by 2 inch area on each pillow case. With your magnifying glass, count the number of dust mites and record the information. Hang Pillow Case #1 in the sun on a hot afternoon for two hours. Wash Pillow Case #2 in hot water at 140 F and dry it in the hot sun for two hours. Wash Pillow Case #3 in the same temperature but place it in the dryer for two hours. Wash Pillow Case #4 in cold water at 32 F and dry in the hot sun. Finally, wash Pillow Case #5 in cold water at 32 F and dry in a dryer for two hours. After the two hours, observe how many dust mites are in the marked area.
In the color affliction experiment, students will find out how different colors affect a person's blood pressure. The controls in this experiment are the rest period in viewing the colors and the length of time each color is viewed. Assemble five friends or students and take their blood pressure without looking at any colors. Record the blood pressure. Show them blue, white, green and yellow for a specified amount of time, one at a time. Immediately after viewing the color, take and record their blood pressure.