Elementary Science Projects

A science fair project is a great way for kids to get involved and learn about biology, chemistry, physics and other subjects within the field. Students are more likely to become engaged during a hands-on project as opposed to a simple lecture. The two main goals of a science project should be to educate students and help them have fun along the way. There are several classic science experiments that kids can recreate on their own.

Diet Coke and Mentos

A science phenomenon involving Diet Coke and Mentos candies has become a Youtube sensation. Open a 2-liter bottle of Diet Coke and drop a few Mentos candies inside. As the candies drop to the bottom, bubbles will start to form inside. The bubbles will rapidly multiply and have nowhere to go but up and out. A geyser of foam will shoot out of the bottle, so be prepared with towels or a tarp. It is believed that the low surface-tension between the soda and the Mentos is what creates the massive amount of bubbles. Regardless, kids will love the eruption.

Volcano

A classic science experiment has students create an active volcano. This project will teach students about reactions. First, build a replica volcano out of clay or paper mache. Once the mold is dry and you are sure there are no cracks, pour vinegar into the volcano. One cup should be enough, but the amount you need will depend on the size of the volcano you created. When you are ready for the reaction to occur, add about 5 tablespoons of baking soda. The baking soda and vinegar will react and cause the volcano to "erupt" and bubble over. Add red food coloring to make the bubbles look like lava.

Swimming Raisins

Another reaction involving baking soda and vinegar will allow you to get raisins to swim. Pour 1/2 cup of vinegar into a large glass. Fill the rest of the glass with water. Stir the mixture together and when you are ready, add 2 tablespoons of baking soda. The mixture will start to bubble. Drop a handful of raisins into the glass. The carbon dioxide bubbles will stick to the raisins and pull them up to the top of the glass. After they reach the top, the bubbles will pop and the raisins will sink back down.

Invisible Ink

You can become an international spy once you have learned how to make invisible ink. Squeeze lemon juice into a bowl and add a few drops of water to dilute the mixture. Try to remove extra pulp as you lightly stir the mixture. Dip an ear swab into the "ink" and write a message on a white sheet of paper. As the paper dries, the lines on the paper will disappear. To see the message, hold up the paper near a small flame or hot bulb. The heat will cause the citric acid to oxidize and turn a yellowish-brown color. Your message will then be visible.